Generally, only a low intensity of blue is needed in a light spectrum for fully functional photosynthesis. Exercise 9A Transpiration. What is the effect of increasing light intensity on transpiration? answer choices. Soil forms layers or horizons, roughly parallel to the earth’s surface, in response to five soil forming factors. This is the currently selected item. Because of this, the transpiration rate is increased by an increase in light intensity. In this lab, you will measure transpiration under various laboratory conditions using a potometer. Transpiration LAB - Transpiration LAB Phaseolus vulgaris L. I could also perform each experiment with a greater number of distances of the fan as this would provide me with more security that there is a linear trend in wind speed and transpiration. When the intensity of sunlight is low, as on a cloudy day, photosynthesis is slower but it does occur. Sterling, Department of Entomology, Plant Pathology and Weed Science, New Mexico State University. How is light intensity modified in this experiment? 2. It refers to the process of absorption of water by the roots and then release of the water in the form of vapour through the leaves. Physical properties such as high solubility also increase reaction rates. Vegetative stage thrives with 400 to 500 nm (e. Light intensity falls to ~zero at night and there is much less light in winter, so these place limits on photosynthesis. Increases in temperature, light intensity, and the presence of dry air currents can increase transpiration rates. (a) Why do you think this distinction is made?. Science & Plants for Schools: www. So when the light intensity increases transpiration rate too increases. Transpiration rates vary widely depending on weather conditions, such as temperature, humidity, sunlight availability and intensity, precipitation, soil type and saturation, wind, and land slope. Hope that helps. To measure the rate of transpiration we use a piece of equipment called a potometer. 6 May 2020. As a result, variability in humidity, light intensity and other environmental conditions affects transpiration which leads to the negative pressure in xylem to be higher some days and lower in some days. However, after reaching an intensity of 10,000 lux, there is no increase in the rate. As the light intensity increases, the rate of photosynthesis increases. | PowerPoint PPT presentation | free to view. Question: Why does a ship rise as it enters the sea from a river?. If water is scarce, or the roots are damaged, a plant may wilt. 5% is lost by transpiration and guttation. In Vicia faba drought and salinity stress has been found to increase the stomatal density and stomatal index, facilitating water uptake under water stressed conditions ( Gan et al. In strong light, the rate of transpiration is more because stomata are wide open. If light intensity is low then photosynthesis will be depressed: under these conditions it makes sense to close the stomata to conserve water. As photosynthesis increases, the amount of stored glucose in the guard cells increases. This carbon dioxide will be supplied by sodium bicarbonate dissolved in the water with the plant leaf disks. Atmospheric Stability. It decreases transpiration rate. At the start of the experiment, in darkness, the difference between apk1b-1 mutant and control mean stomatal conductances was not significant. Without water, plants would not be able to uptake nutrients or transport nutrients within their tissue. They lose approximately 97% of the water taken up by their roots to transpiration -- the cost of having stomata open during the day, something the arid-dwelling CAM plants cannot afford to do. Light intensity rapidly decreases as the distance from the light source increases. ScienceProject. kelloggi saplings in four growth chambers during the spring/summer of 2006 (with controlled light, temperature and CO2, under. These lamps are set up to increase light intensity and they are used to extend the day length. Too much or too little humidity can be dangerous. Any further increase in the amount of light striking the leaf does not cause an increase in the rate of photosynthesis--the amount of light is said to be 'saturating' for the photosynthetic process. Light reactions take place only in the presence of light. This would create more shallow and stable coastal water, conditions that are. Other factors like light intensity and carbon dioxide concentration in the leaves influence the opening and the closing of the stomata. Photosynthesis comes from Greek and means ‘putting together with light. •flowers on the same plant. Decrease it put potometer in cupboard. In strong light, the rate of transpiration is more because stomata are wide open. At 30°C, a leaf may transpire three times as fast as it does at 20°C. 5b Plants transpiration & transport DRAFT. When light intensity increases, the rate at which the chlorophyll changes CO2 to O2 increases too as the chlorophyll are getting more energy from the light. Why was the invention of the telegraph important to weather forecasting? What is the definition of dew point? Why is it less likely that water vapor will condense from warmer air? Explain the force that causes water vapor to condense. With the increase in atmospheric temperature, the rate of transpiration also increases. This is not only because evaporation occurs quickly in warmer air but also because warm air is capable of holding more water vapors than the cold air. It, therefore, undergoes refraction while entering from one layer into another. Sterling, Department of Entomology, Plant Pathology and Weed Science, New Mexico State University. Self pollination is a type of pollination which occurs in a single flower or two flowers on a single plant. The effect of light on the rate of transpiration Light is needed to drive the process of photosynthesis. But remember that LEDs have to be in a balance between light magnitude and your coverage area. Light is absorbed by: - chlorophyll leads to production of ATP - water → splits/photolysis into oxygen & hydrogen. When intensity of light is high, the temperature is higher and hence transpiration increases which leads to closing up of stomata and thus the photosynthesis decreases. Although the range in leaf nitrogen content. These can include the number and the size of the leaves on the plant, the number of stomata and the thickness of the cuticle, which is a waxy and water-repelling coating that is. C 4 plants have greater rates of CO 2 assimilation than C 3 species for a given leaf nitrogen when both parameters are expressed either on a mass or an area basis (Ghannoum et al. Temperature - A high temperature increses the capacity of the air. Transpiration and Respiration of Fruits and Vegetables 1Bryan R. As you heat a substance, its molecules move faster and are more likely to react. Fricke ABSTRACT Transpiration is the process by which fresh fruits and vegetables lose moisture. Transpiration is increased as optimal light levels are approached. Name four factors the transpiration rate can be affected by Light intensity Temperature Air movement Humidity How and why does an increase in light intensity increase transpiration rate? Transpiration increases because the stomata open wider to allow more carbon dioxide into the leaf for photosynthesis. Transpiration - Introduction. Wind alters the balance of hormones. Humidity is important because it decreases transpiration/ water loss, allowing dew droplets to be larger. It refers to the process of absorption of water by the roots and then release of the water in the form of vapour through the leaves. improve this question. Light intensities and leaf temperatures were such that photosynthesis would have been over 900Jo of maximum. Without water vapor in the air, our. That being said, there is some extension toward the middle of the spectrum with the beta carotene and other pigments. This increases both their nitrogen and water use efficiency compared to C 3 species. In this experiment, the light intensity is changed, by decreasing the light intensity. What do plants compete for? Light, space, water, mineral ions Name some abiotic factors Temperature, light intensity, temperature, carbon dioxide level, wind intensity, oxygen level, pH Name some biotic factors New predators, competition, new pathogens, availability of food What do we mean by interdependence?. Higher transpiration rates will pull more water out of the fertigation solution - leaving behind a relatively high concentration of mineral ions from the ammonium nitrate (nitrogen salts) in the media or root zone. Since many chemical reactions can occur at room temperature, you might assume that temperature has no bearing on whether or not a reaction will transpire. CXC CAPE. Botanical Bulletin of Academia Sinica, Vol. Regulation of transpiration, therefore, is achieved primarily through the opening and closing of stomata on the leaf surface. The effect of blue light on plants is directly related to chlorophyll production. This ensures the increase in your light magnitude permitting you to maximize what you get out of your grow lights. Blue light, for example, helps encourage vegetative leaf growth. The transpiration stream in a plant; The pathway followed by water and minerals from the soil, through the root into the vascular system and hence to the leaves, is indicated by the blue arrows. Decrease light=less transpiration. Physical properties such as high solubility also increase reaction rates. It also cause the stomata to open, thus more transpiration occurs during the day and the rate is higher on a sunny day compared to a cold dull day. It affects it by the increase of light intensity it increases the rate of photosynthesis but after the light intensity reaches its certain level the plant reaches its maximum rate of photosynthesis and photosynthesis occurs in the chloroplast. 5hr or at least 80mins. This increases both their nitrogen and water use efficiency compared to C 3 species. During the first stage of photosynthesis (the light dependent stage) light energy is absorbed by photosynthetic pigments, particularly the green pigment chlorophyll. In order to carry on cellular respiration, plant cells need oxygen and a means of disposing of carbon dioxide (just as animal cells do). Transpiration is increased as optimal light levels are approached. The remaining 97-99. As predicted when the light intensity increases so does the rate of photosynthesis. Dark surfaces--whether a black t-shirt or an asphalt street--absorb the sun's heat, while lighter colored surfaces reflect heat from the sun. CO2 concentration and light also affect the stomata opening and transpiration rate (Raven, 2011). Transpiration is one of those physiological processes found in plants. Theory and evidence indicate that trees and other vegetation influence the atmospheric water-cycle in various ways. In the daylight period the stomata gets opened and that causes to increase in the rate of transpiration. factors that could be limiting the rate of photosynthesis at a light intensity of 250 arbitrary units. | PowerPoint PPT presentation | free to view. 54 bronze badges. As the air becomes dry, the rate of transpiration also increases proportionately. Thus, this showed that the improved photosynthetic parameters enhanced the carbon gain and promoted the soybean growth ( Liao et al. Because nitrogen (N 2) and oxygen (O 2) are abundant at 50 km and act as GHG’s to absorb the UVC + UVB rays 3. Self pollination is a type of pollination which occurs in a single flower or two flowers on a single plant. Tags: Question 22. Light intensity falls to ~zero at night and there is much less light in winter, so these place limits on photosynthesis. When wind movement around a given plant increases, the rate of transpiration is bound to increase. Direct sunlight has the same effect as temperature as it warms the leaves up quicker. However, there is a considerable disparity when it comes to temperature stress in plants. Researchers do not yet know why higher atmospheric CO 2 alters crops’ nutritional content. Both corn and soybean are susceptible to extreme heat (and water) stress during early vegetative stages as well as later critical growth stages (pollination for corn and flowering for soybean). This virtual experiments require Adobe Flash. light: rate of photosynthesis increases as light intensity increases photosynthetic rate reaches plateau at high light levels CO2: photosynthetic rate reaches plateay at high carbon dioxide levels. Light intensity was set at a relatively low level to mimic the natural understo rey habitat of Q. Light: Stomata open in the presence of light and close in darkness. Extreme heat stress can reduce plant photosynthetic and transpiration efficiencies and negatively impact plant root development, which collectively can negatively impact yield. Asked in Statistics. CO2 concentration and light also affect the stomata opening and transpiration rate (Raven, 2011). Factor # 3. Water availability has a major effect on plants. Light intensity rapidly decreases as the distance from the light source increases. When light intensity is low, transpiration is low. Leaf surfaces are dotted with pores called stomata, and in most plants they. The stomata are closed. , 2004 Department of Entomology, Plant Pathology and Weed Science New Mexico State University [email protected] Plant adaptations. The Direct and Indirect Effects of Increased Carbon Dioxide on Plant Growth The direct effects of increased carbon dioxide (CO 2 ) on plant growth refers to the change in plant grow with the levels of temperature, precipitation, evaporation and growing season at their present values. Increased temperature increases transpiration, as increased heat makes evaporating easyer. When light and temperature are in balance, the level of ambient CO 2 will be the limiting factor. (ii) Wind:. My experiment was designed to check the stomata opening in light. 5% is lost by transpiration and guttation. the contents of the leaf are less dilute). Conductance increases with rate of photosynthesis. Criticism of the law of limiting factors. , wind velocity, storm intensity radius of maximum wind) and degree of exposure (Krauss et al. This was hypothesized, because according to Dr. As light intensity increases, the rate of transpiration will also increase considerably. When discussing light, three components must be taken into consideration: light intensity, light quality, and photoperiod. The heat contained in a body depends not only on its temperature but also its mass. Why can having one disease increase the chance of getting another disease? How can diet affect malnutrition? Why does alcohol cause problems for people and for society? Why are there a range of treatments for cardiovascular disease? Which group of organism include pathogens? SB5f Virus life cycles. the slope of the linear part of the curve for Co 2 uptake versus absorbed quanta, is inhibited to the same degree as the light saturated rate at all oxygen concentrations studied. Students examine in detail the water cycle components and phase transitions, and then. To arrive at the rate of transpiration, therefore, you must calculate the leaf surface area of each plant: Because most. It is interesting that low intensity (450. Greenhouse design/operation and light intensity. 30 seconds. Climate change might affect rainfall patterns, leading to alternating periods of drought and intense storms. - 3m or more of precipitation experience a decline in NPP because nutrients are leached away from the soil, and the rate of decomposition is reduced because the soil is waterlogged. However, increased light intensity also increases the rate of transpiration, which will cause you to irrigate your crop more frequently. • Stigma is feathery to trap pollens carried by wind currents. We increase light levels by investing in alternative technologies such as state-of-the-art retractable roof greenhouses to maximize available sunlight, or installing high intensity discharge (HID) lights. * Most of the factors that result in a change in transpiration rate are linked to diffusion. The Direct and Indirect Effects of Increased Carbon Dioxide on Plant Growth The direct effects of increased carbon dioxide (CO 2 ) on plant growth refers to the change in plant grow with the levels of temperature, precipitation, evaporation and growing season at their present values. Carotenes (an antioxidant orange pigment in carrots and many orange fruits and vegetables responsible for vitamin A) are stimulated by blue light, producing an orange - red spectrum through excitation and. Increases in temperature, light intensity, and the presence of dry air currents can increase transpiration rates. Since the middle of the 19th century, the level of carbon. This is illustrated by the light saturation curves for CO2 uptake. What effect does the soil surface hydraulic conductivity have on infiltration? How does formation of a surface crust affect infiltration? 24. Photosynthesis cannot occur in the dark and the source of light for the plants is sunlight. A motor was arranged so as to flex each might possibly increase transpiration have been ex-plored theoretically: I. C 4 plants have greater rates of CO 2 assimilation than C 3 species for a given leaf nitrogen when both parameters are expressed either on a mass or an area basis (Ghannoum et al. Light intensity rapidly decreases as the distance from the light source increases. Nobody gives it a second thought that women are given lighter. 3 Name parts of the organ system used to transport materials around a plant. This carbon dioxide will be supplied by sodium bicarbonate dissolved in the water with the plant leaf disks. Light Intensity: Increasing the light intensity to which a plant is exposed is predicted to cause an increase in the rate of transpiration; Increasing light exposure will cause more stomata to open in order to facilitate photosynthetic gas exchange; The effect of light intensity can be tested experimentally by placing the plant at variable. Becker, Ph. The rate of transpiration is measured as the amount of water lost/ square meter/ minute. It affects it by the increase of light intensity it increases the rate of photosynthesis but after the light intensity reaches its certain level the plant reaches its maximum rate of photosynthesis and photosynthesis occurs in the chloroplast. When energized electrons move down an electron transport chain, energy is captured and used for ATP production. The effect of blue light on plants is directly related to chlorophyll production. How does the light intensity affect the rate of transpiration? Objective: To investigate whether light intensity affects the rate of transpiration. Light intensity causes the stomata to open and the rate of transpiration to increase. Beyond the optimum light intensity the rate of photosynthesis becomes constant. Senior Biology Projects (Grades 9 - 12) Support and more details on these projects is available at www. The sequence of the imposed. sun leaves may have a thicker cuticle and several layers of palisade cells with the chloroplasts concentrated in them. 72 mPa at noon under high and moderate temperatures, respectively (Hall and Kaufman, 1975). When the intensity of sunlight is low, as on a cloudy day, photosynthesis is slower but it does occur. This decreases the plant transpiration rates. com This series grow light emits all the wavelengths of light which can be fully absorbed by the plants to create photosynthesis and promote healthy growth budding and flowering. Lab group 6B hypothesized that the transpiration rate would increase as light intensity increased, due to the stomata opening more with increased light. For all plants, increased wind and higher temperature increase the transpiration rate. If a plant is continually left in the light or in the path of a fan (wind), then it will lose the most mass through transpiration out of all of the plants because light promotes more photosynthesis to occur, which requires the intake of CO2 and the release of water through the stomata. Rates of transpiration depends on humidity and light intensity, which varies day to day. Plants have adapted to live in shaded areas by having larger and thinner leaves to increase the number of chlorophyll molecules to absorb light (see graph 8). This is the currently selected item. Germination- a) Red light (peak at 660 nm and within the visible spectrum) promotes germination of seeds of many pioneer species which might be buried in the soil. As photosynthesis increases, the amount of stored glucose in the guard cells increases. Humidity - When the atmosphere is saturated with water vapour, little more can be absorbed from the plants, and transpiration will be reduced. To be more precise transpiration is inevitable if the total eco system is to exist. 17 A decrease in which factor normally causes transpiration rate to increase? A humidity B light intensity C stomatal opening D temperature 18 What is the path of water through a plant? A cortex cells → xylem → stomata → roots B root hair → xylem → mesophyll cells → stomata C roots → cortex cells → stomata → phloem. Light intensity was set at a relatively low level to mimic the natural understo rey habitat of Q. Decreased light is the opposite. If wind blows the humidity bubble away, however, transpiration increases. The remaining 97-99. The atmospheric temperature is an important external factor affecting photosynthesis. sun leaves may have a thicker cuticle and several layers of palisade cells with the chloroplasts concentrated in them. The rate begins to level off because another limiting factor (eg light) is preventing the rate increasing. Society tends to focus on gender biases when women are under represented or taken advantage of, not the reverse. For example, India's population of one billion people produces more carbon dioxide just by breathing than is produced by all the coal-burning power plants in the United States. These questions will build your knowledge and your own create quiz will. Light is also the chief source of heat energy for the plant, enhancing evaporation. a) increase in supporting, non-photosynthetic tissue which has respiration that reduces net photosynthesis. Formulate hypotheses about photosynthesis rates in plants from different environments. The stomata are closed. The sequence of the imposed. Question: Why does a ship rise as it enters the sea from a river?. It requires the energy of sunlight. When light intensity is low, transpiration is low. Light Levels. Increased light intensity will increase the rate of photosynthesis so more water is drawn into the leaves where photosynthesis primarily takes place and therefore the rate of transpiration is greater. In order to carry on photosynthesis, green plants need a supply of carbon dioxide and a means of disposing of oxygen. The anomaly is an anomaly because at five arbitrary units the bubbles per minute was a lot higher than the other light intensity points, though it goes with the trend of the points in which the points all increase in bubbles per minute as the light intensity increases. Increasing light intensity increases/decreases rate of transpiration. Transpiration rates mirrored stomatal conductance changes determined in parallel assays (not shown). Decrease light=less transpiration. This is why greenhouse vegetables, whether grown in soil or in a hydroponic system, will not do as well during winter, even with the best heating system on the market. Why does water loss slow down if a plant is put into a plastic bag? is related to Transpiration Quiz Test | What is transpiration in biology?. Because of this, the transpiration rate is increased by an increase in light intensity. Discover new way of learning Physics. Since the middle of the 19th century, the level of carbon. Wavelength is defined as the distance from peak to peak (or trough to trough). The rate commonly is low early in the morning of a clear day and is associated with low light intensity and sometimes with low temperature, despite a high leaf water potential (Ψ) and high CO 2 concentration in the intercellular spaces of leaves. It increases transpiration rate. On the other hand due to blowing of wind the evaporation rate also increases. In light , guard cells take up water by osmosis and become turgid. m From which part of the human digestive system is. Water vapour is removed quickly by air movement, speeding up diffusion of more water vapour out of the leaf. This primarily occurs because the opening of the stomata is stimulated by light and because light warms the leaf which leads to quicker transpiration. Different plants also vary in the rate of transpiration and in the regulation of stomatal opening. That being said, there is some extension toward the middle of the spectrum with the beta carotene and other pigments. Even though the stomates open to release water. That’s why many people use a humidity dome or “cloner” to artificially raise the humidity for clones. Variable-Manipulated variable: Light intensity-Responding variable : Time taken for the air bubble to travel 10 cm. Therefore, experiment 9 which was a control experiment produced a significantly lower average rate than the control experiments 1 and 2. Sterling, Department of Entomology, Plant Pathology and Weed Science, New Mexico State University. Light reactions are the energy-capturing reactions. The degree of inhibition is independent of light intensity. At high light intensity, the rate of photosynthesis increases. water uptake by a plant, to include light intensity, air movement and temperature 1a, 1c 2b, 2c 4a, 4b, 4c, 4d 6. Illumination only was interrupted from 1900 to 0500 of the fol-lowing day. 0025 ml/minute. Transpiration is greater in day light as it enlarges the size of stomata and more water is lost to atmosphere. Prior knowledge Air contains oxygen, carbon dioxide and nitrogen but only carbon dioxide is an acid gas. Physical characteristics of the plant will also affect the process. Select a topic and fill in the contact form. Variable-Manipulated variable: Light intensity-Responding variable : Time taken for the air bubble to travel 10 cm. This is the currently selected item. Brassavola are fast-growing orchids and will quickly begin to yield divisions to increase your collection or make your orchid-loving friends very happy. Higher transpiration rates will pull more water out of the fertigation solution - leaving behind a relatively high concentration of mineral ions from the ammonium nitrate (nitrogen salts) in the media or root zone. C 4 species have evolved in a high CO 2 environment. When discussing light, three components must be taken into consideration: light intensity, light quality, and photoperiod. These can include the number and the size of the leaves on the plant, the number of stomata and the thickness of the cuticle, which is a waxy and water-repelling coating that is. 30 seconds. It is the loss of water from parts of plants (similar to sweating), especially in leaves but also in stems, flowers and roots. To a first approximation, thylakoid nitrogen is proportional to the chlorophyll content (50 mol thylakoid N mol-1 Chl). At high light intensities the rate becomes constant, even with further increases in light intensity, there are no increases in the rate. Gynocentrism has been the norm and so accepted that people don't stop to think or complain about this gender bias. (c) False. Solvent polarity can either increase or decrease the reaction rate of a reaction, but increasing solvent viscosity generally decreases. Does the relationship in question 1 change when light intensity increases above 400 (mol l photons/m2/s? Explain your answer. Researchers do not yet know why higher atmospheric CO 2 alters crops’ nutritional content. transpiration? Temperature Humidity Light intensity Air movement Define the following terms: Health Disease Communicable Non‐communicable Label the leaf below Adaptations of plant tissues: Epidermal tissue Palisade mesophyll Spongy mesophyll Xylem and phloem Meristem In plants, how are the following cells specialised: • Root hair cell. This lowers the water potential of the leaf (i. As temperature and light intensity increase naturally throughout the day, levels of carbon dioxide decrease. Organisms continue to evolve. When light intensity increases, the guard cells take up water by osmosis and become turgid which causes the stomata to. Other factors such as light intensity and carbon dioxide concentration in the leaves influence the opening and the closing of stomata. Name 3 factors that affect the rate of transpiration. Transpiration also plays a big role in helping water move around the plant by changing the water pressure in plant cells. When luminosity is high the photosynthesis rate increases and the stomata open to absorb more carbon dioxide from the environment and release heat; when luminosity is low, stomata tend to close. Explanation. What effect does soil water content at the onset of infiltration have on infiltration? 25. This is called the transpiration stream. Wavelength is defined as the distance from peak to peak (or trough to trough). Secondly, it increases the temperature of leaf and thus affects the rate of transpiration. Prior knowledge Air contains oxygen, carbon dioxide and nitrogen but only carbon dioxide is an acid gas. A side effect of opening the stomata is an increase of water loss through transpiration. CXC CAPE. Light intensity: The transpiration rate is increased due to the increase in light intensity. The effect of light on the rate of transpiration Light is needed to drive the process of photosynthesis. Light is an extremely important factor for the process. • Stigma is feathery to trap pollens carried by wind currents. Title: Light Intensity and Transpiration Created Date: 20160807084354Z. This is the currently selected item. The thoughts are that they had plenty of light and were not pressured to develop more efficient light gathering. P lay, L earn, I nteract & e X plore math & science concepts with our. The atmospheric temperature is an important external factor affecting photosynthesis. The main type of potometer is the 'bubble' potometer shown in the figure below. A number of measurement scales have been invented to measure temperature. In addition plant stomata number increases with the intensity of the blue light fraction, possibly increasing photosynthetic rates further. The anomaly is an anomaly because at five arbitrary units the bubbles per minute was a lot higher than the other light intensity points, though it goes with the trend of the points in which the points all increase in bubbles per minute as the light intensity increases. Different plants also vary in the rate of transpiration and in the regulation of stomatal opening. Lesson: Transpiration - Water Movement through Plants. The rate at which water moves through the plant to replace water lost by leaves increases with the gradient in water potential between xylem elements in the leaf and matric potential in the soil. How does the light intensity affect the rate of transpiration? Objective: To investigate whether light intensity affects the rate of transpiration. In a nut shell, the combined affect of light causes opening of stomata and incerases the rate of vaperisation of water. When light and temperature are in balance, the level of ambient CO 2 will be the limiting factor. Hide Show resource information. Moore, 2011). How does wind affect the transpiration rate of a plant? Conclusion Based on our results, our hypothesis, if the leaves are exposed to a windy environment, then the transpiration rate will increase, was accepted. LED GROW LIGHT-AYZ SERIES US: (+1)973-960-1877 Contact: Cady Liu Mobile: (973)960-1877 Email: [email protected] Transpiration - What and Why? Transpiration - What Controls Rates of Transpiration?. Light intensity at needle surface was fixed at 400 µmol m −2 s −1 PPFD. CAPE Unit 2 Labs; BIO LABS Author: Alex Clarke. J inan Cao has been dissecting the nature of the greenhouse effect and a key calculation that I normally just accept without questioning. C 3 vs C 4 species. Why does temperature and light intensity increase the rate of transpiration?. Note: For the Common Entrance exam you need to know about the colour change when zinc oxide is heated but not why it happens. If a plant is continually left in the light or in the path of a fan (wind), then it will lose the most mass through transpiration out of all of the plants because light promotes more photosynthesis to occur, which requires the intake of CO2 and the release of water through the stomata. As temperature increases, so does the rate of transpiration, opening the stoma (pores in the epidermis) for gas exchange and water vapor loss. How much of the Earth’s surface is covered by water? Water reflects light more than land does. They reported a larger increase, from 400 to 1,200 fmol Suc guard cell pair −1, in guard cell symplast Suc contents over the day. This range extends from violet (400nm) to red (700nm). This is largely because light stimulates the opening of the stomata , Light also speeds up transpiration by warming the leaf. Plants have adaptations that allow it to do a p articular job. It is interesting to note that over time, plants can increase their capacity to cope with light related heat stress. That being said, there is some extension toward the middle of the spectrum with the beta carotene and other pigments. This was hypothesized, because according to Dr. When energized electrons move down an electron transport chain, energy is captured and used for ATP production. BLUE light carries a higher energy signature then RED light does and that higher energy with a shorter wavelength should provide the plants with a better environment for growth. Visible light is a representation of radiant energy in the form of light waves that measure in intensity between 400 and 700 nanometers (nm). White light is separated into the different colors (=wavelengths) of light by passing it through a prism. amount of water can evaporate through transpiration. However, in CAM plants the stomata open in dark and remain closed in light. Increase in energy increases the rate of active transport. Gas Exchange in Plants. These sugars are the source of food, fiber and fuel for life on Earth. It was predicted that a level would be reached where increasing the light intensity would have no more effect on the rate of reaction as there would be some other limiting factor which limits the rate of the reaction. This is definitely a plant that you do need to keep very close to a window. How does temperature light intensity and wind affect transpiration. Measuring Transpiration. Brassavolas prefer light that is similar to the Cattleya orchids light requirements: bright light, but no direct sun. As you heat a substance, its molecules move faster and are more likely to react. Even when you stop your exercise, the heart rate doesn’t return to normal immediately. Light: Increase in light intensity raises the temperature of leaf cells and thus increases the rate of transpiration; Relative humidity: Increase in atmospheric humidity decrease the rate of transpiration; Wind: More Why is transpiration called a necessary evil? Ans. the contents of the leaf are less dilute). Water is conserved when the guard cells are closed. Any further increase in the amount of light striking the leaf does not cause an increase in the rate of photosynthesis--the amount of light is said to be 'saturating' for the photosynthetic process. Phototropism, plant growth towards or away from light, and photoperiodism, regulation of flowering and other developmental transitions by day/night length. How does light intensity and carbon dioxide levels affect photosynthesis rate Phaladi Phaladi 201102379 Department Of Mathematics And Science Education University Of Botswana Plants, through the use of chlorophyll (green pigment in plants) that traps light can generate 'food' by combining carbon dioxide in the air and water. C 4 species have evolved in a high CO 2 environment. Any three from the following: • temperature; • light intensity; • air flow; • humidity. This stress increases the plants ability to deliver nutrients to the top nodes on that branch while opening up the lower branches to more light. Transpiration - Overview and Objectives. These sugars are the source of food, fiber and fuel for life on Earth. Amplification of heat extremes by plant CO 2 physiological. I could also perform each experiment with a greater number of distances of the fan as this would provide me with more security that there is a linear trend in wind speed and transpiration. - 3m or more of precipitation experience a decline in NPP because nutrients are leached away from the soil, and the rate of decomposition is reduced because the soil is waterlogged. carbon dioxide or temperature. Sterling, Ph. The insects are light enough so they do not break the hydrogen bonds holding the water molecules together The insects actually use their wings to hover slightly above the water's surface and they only skim it with their feet. 2°C, have been predicted by five independent general circulation models (GCMs) for. When the intensity of sunlight is low, as on a cloudy day, photosynthesis is slower but it does occur. Full text of "Why does man exist? : the continuation and conclusion of Whence comes man?" See other formats. The high temperatures were 27 (day) and 22 (night). 57B understand how the rate of transpiration is affected by changes in humidity, wind speed, temperature and light intensity There are 4 main limiting factors of transpiration. When light intensity increases, the guard cells take up water by osmosis and become turgid which causes the stomata to open. asked May 19 '17 at 5:29. Discussion The light intensity under which a plant is grown can have an important effect on its photosynthetic capacity. l Why are enzymes referred to as ‘biological catalysts? They speed up useful chemical reactions in the body. Elevated carbon dioxide concentrations in the atmosphere may increase water-use efficiency in crops and considerably mitigate yield losses due to climate change, according to a new NASA study. Measuring Transpiration. Description and explanation for graph 4. In Vicia faba drought and salinity stress has been found to increase the stomatal density and stomatal index, facilitating water uptake under water stressed conditions ( Gan et al. What environmental factors will affect the rate of transpiration? humidity (amount of moisture in the air) light intensity temperature air movement (wind). Transpiration - What and Why? Transpiration - What Controls Rates of Transpiration?. The light intensity received by an indoor plant depends upon the nearness of the light source to the plant. Plants see blue light as well as red light, using a photoreceptor that is called a cryptochrome. Dark surfaces--whether a black t-shirt or an asphalt street--absorb the sun's heat, while lighter colored surfaces reflect heat from the sun. Atleast 1 hr was allowed for adjustment to change in environment before recording rates of transpiration. This was hypothesized, because according to Dr. Water is conserved when the guard cells are closed. We are ready to respond on short notice to ensure that real estate and other property restored to its origins in the fastest possible way. Plants need CO 2 to enter and O 2 to exit. Assessing the impact of changing humidity and air movement on plant uptake of water provides essential experience for understanding plant adaptations. Reaction rates generally increase with increasing reactant concentration, increasing temperature, and the addition of a catalyst. They reported a larger increase, from 400 to 1,200 fmol Suc guard cell pair −1, in guard cell symplast Suc contents over the day. When open, stomata allow CO 2 to enter the leaf for synthesis of glucose, and also allow for. Theory and evidence indicate that trees and other vegetation influence the atmospheric water-cycle in various ways. used for electric dryer). Why does the icebergs floating on the sea water 5. An increase in light intensity increase the rate of transpiration because the stomatal pores are only open for water to leave the leaf when it is light. Why does transpiration increase if the wind blows? Water vapor is moved away from the leaves, increasing water potential gradient between the leaf and the atmosphere 19 of 27. an increase in light intensity is due largely to a change in the rate of transpiration rather than in the rate of photosynthesis? 5. Because of this, the transpiration rate is increased by an increase in light intensity. Vaseline is applied around the rubber bungs to ensure an airtight seal, thus the only water loss from the apparatus is via transpiration. Light intensity:- if the light intensity is increased, the number of bubbles produced by the Elodea will also increase which is why I have to make sure that it remains constant, so as to produce more accurate results. explain how the rate of transpiration is affected by changes in humidity, wind speed, temperature and light intensity. Photosynthesis is one of the most remarkable biochemical processes found on Earth and allows plants to use sunlight to make food from water and carbon dioxide. Light intensity increases rate of photosynthesis. This is due to the positive influence of light on the rate of transpiration. transpiration. dailyscript. The atmospheric carbon dioxide concentration has risen from about 270 parts per million (ppm) before 1700 to about 355 ppm today. 17 A decrease in which factor normally causes transpiration rate to increase? A humidity B light intensity C stomatal opening D temperature 18 What is the path of water through a plant? A cortex cells → xylem → stomata → roots B root hair → xylem → mesophyll cells → stomata C roots → cortex cells → stomata → phloem. 50 of the Carnegie Institution. Rate of photosynthesis increases with an increase in the carbondioxide concentration. As the water potential decreases, more water enters the guard cells making them more turgid. What effect does soil water content at the onset of infiltration have on infiltration? 25. How does wind affect the transpiration rate of a plant? Conclusion Based on our results, our hypothesis, if the leaves are exposed to a windy environment, then the transpiration rate will increase, was accepted. When writing explanation, try to include references to the concentration gradient caused by a change in the factor. I will make sure that the lamp remains at the same distance from the Elodea by marking its position with a pencil. Hydrogen & ATP are used in light in dependent reactions, oxygen is released as waste. As the temperature increases, the rate of evaporation and diffusion increases as the particles have more energy. Any further increase in the amount of light striking the leaf does not cause an increase in the rate of photosynthesis--the amount of light is said to be 'saturating' for the photosynthetic process. 32 silver badges. - 3m or more of precipitation experience a decline in NPP because nutrients are leached away from the soil, and the rate of decomposition is reduced because the soil is waterlogged. 17 A decrease in which factor normally causes transpiration rate to increase? A humidity B light intensity C stomatal opening D temperature 18 What is the path of water through a plant? A cortex cells → xylem → stomata → roots B root hair → xylem → mesophyll cells → stomata C roots → cortex cells → stomata → phloem. This will set a few pigeons loose, but it will be interesting to see where they land. Stomata are surrounded by two specialized cells called guard cells, which open and close in response to environmental cues such as light intensity and quality, leaf water status, and carbon dioxide concentrations. Stomata open in the light for photosynthesis therefore an increase in light intensity increases transpiration rate. Different plants also vary in the rate of transpiration and in the regulation of stomatal opening. Society tends to focus on gender biases when women are under represented or taken advantage of, not the reverse. The rate of reaction begins to level off because another factor is limiting the reaction e. I should perform the experiment with 3 other plants of the same species and age to ensure reliability. Transpiration - Overview and Objectives. Intensity of Light. Evaporation rates will be high where leaves are exposed directly to the sun Various things may cause the colour difference in the leaves e. Regular workouts can make a real difference in your energy level and mood. Donate or volunteer today!. Theory and evidence indicate that trees and other vegetation influence the atmospheric water-cycle in various ways. (a) Why do you think this distinction is made?. kelloggi saplings in four growth chambers during the spring/summer of 2006 (with controlled light, temperature and CO2, under. Is there any way of measuring transpiration rate without using a potometer? I am investigating the relationship between leaf area and transpiration rate. The plants grew to have a shade avoidance-like morphology which enabled them to (almost) reach the LED lights. A potometer measures how factors such as light, temperature, humidity, light intensity and wind will affect the rate of transpiration. carbon dioxide or temperature. (ii) Wind:. The main type of potometer is the ‘bubble’ potometer shown in the figure below. However, some factors can also affect the rate of transpiration in plants, including humidity, wind, the intensity of light, and environmental temperature. Can you suggest how I can change the area of a leaf? A potometer is literally a "drinking meter", so anything which measures the uptake of water by a shoot or leaf is a potometer. What environmental factors will affect the rate of transpiration? humidity (amount of moisture in the air) light intensity temperature air movement (wind). Transpiration Formal Lab Report By Jessica Tran Introduction When water is transported from the roots to the mesophyll cells in the leaves, it is evaporates out the stomates, called transpiration, to create a lower osmotic potential. Stomata are small pores, typically on the undersides of leaves, that are opened or closed under the control of a pair of banana-shaped cells called guard cells (see figure above). Light: Increase in light intensity raises the temperature of leaf cells and thus increases the rate of transpiration; Relative humidity: Increase in atmospheric humidity decrease the rate of transpiration; Wind: More Why is transpiration called a necessary evil? Ans. Celebrating Prezi's teacher community for Teacher Appreciation Week. When wind movement around a given plant increases, the rate of transpiration is bound to increase. The guard cells lose turgor, the stomates partially or completely close, and the rate of diffusion of carbon dioxide into the. Transpiration - Overview and Objectives. Temperature, light intensity, air currents, and humidity are some of these factors. In a majority of plants, the stomata are open during the day and closed at night. The xylem tissue is composed of hollow tubes strengthened by lignin. Light intensity: The transpiration rate is increased due to the increase in light intensity. It increases transpiration rate. Exercise 9A Transpiration. Sterling, Ph. The greening represents an increase in leaves on plants and trees. Other factors such as light intensity and carbon dioxide concentration in the leaves influence the opening and the closing of stomata. Illumination only was interrupted from 1900 to 0500 of the fol-lowing day. Disturbance exposes them to light at 660 nm. As you heat a substance, its molecules move faster and are more likely to react. Increasing light -> increased photosynthesis--> stomata open--> more water lost by transpiration. Question might arise that why the transpiration is important. Light is also the chief source of heat energy for the plant, enhancing evaporation. stomatal closure and measurable transpiration occurred in the dark. This was hypothesized, because according to Dr. Discoloration of light-colored fruits can be reduced by using an antioxidant, such as ascorbic acid or citric acid, before freezing. What a pH indicator does. Easily return to any page in any book in our library. Because this is the area of the stratosphere where ozone (O 3) is. The color of the assay solution indicated the concentration of hydrogen peroxide. Traditional fertilizer blends containing B struggle. Did any of the environmental factors (heat, light, or wind) increase the transpiration rate more than the others? Why? -Wind and heat increased the transpiration rates the most. Increased light intensity will increase the rate of photosynthesis so more water is drawn into the leaves where photosynthesis primarily takes place and therefore the rate of transpiration is greater. 2006, Zhang et al. Plants have adaptations that allow it to do a p articular job. Transpiration + Translocation. While there is little doubt that changes in tree cover will impact the water-cycle, the wider consequences remain difficult to predict as the underlying relationships and. I predicted that a level would be reached where increasing the light intensity would have no more effect on the rate of reaction as there would be some other limiting factor which limits the rate of the reaction. Some plants develop adaptations to reach the light, for example, climbing plants may twine around or grasp a support to pull themselves upwards. Photosynthesis, the process by which green plants and certain other organisms transform light energy into chemical energy. Temperature, light intensity, air currents, and humidity are some of these factors. Decreased light is the opposite. Transpiration is one of those physiological processes found in plants. Light quantity refers to the intensity, or concentration, of sunlight. Does the relationship in question 1 change when light intensity increases above 400 (mol l photons/m2/s? Explain your answer. Assessing the impact of changing humidity and air movement on plant uptake of water provides essential experience for understanding plant adaptations. The rate commonly is low early in the morning of a clear day and is associated with low light intensity and sometimes with low temperature, despite a high leaf water potential (Ψ) and high CO 2 concentration in the intercellular spaces of leaves. Plants which live in extreme environments have adaptations to control their transpiration rate. Title: Light Intensity and Transpiration Created Date: 20160807084354Z. Rate of photosynthesis increases with an increase in the carbondioxide concentration. While explaining the principle of limiting factors, Blackman presented abrupt breaks in the rate of photosynthesis due to the low intensity of light. Transpiration rates mirrored stomatal conductance changes determined in parallel assays (not shown). The amount of wind, the temperature, and the amount of light can cause the change in the rate of transpiration. Here you can create your own quiz and questions like Why does water loss slow down if a plant is put into a plastic bag? also and share with your friends. cut a shoot at a slant underwater. pH refers to the ability of the water to be more on the acidic side of the pH scale or on the basic side of the pH scale. , 2004 Department of Entomology, Plant Pathology and Weed Science New Mexico State University [email protected] Elevated carbon dioxide concentrations in the atmosphere may increase water-use efficiency in crops and considerably mitigate yield losses due to climate change, according to a new NASA study. Increased light intensity will increase the rate of photosynthesis so more water is drawn into the leaves where photosynthesis primarily takes place and therefore the rate of transpiration is greater. It refers to the process of absorption of water by the roots and then release of the water in the form of vapour through the leaves. Description and explanation for graph 4. It is the loss of water from parts of plants (similar to sweating), especially in leaves but also in stems, flowers and roots. Higher transpiration rates will pull more water out of the fertigation solution - leaving behind a relatively high concentration of mineral ions from the ammonium nitrate (nitrogen salts) in the media or root zone. It is interesting to note that over time, plants can increase their capacity to cope with light related heat stress. For all plants, increased wind and higher temperature increase the transpiration rate. The guard cells lose turgor, the stomates partially or completely close, and the rate of diffusion of carbon dioxide into the. Why does ARROW #3’s radiation get attenuated below 50 km? 1. Both the light intensity required for saturation and the light-saturated rate for CO2 uptake increase with the light intensity under which the plants were grown. Water vapour is removed quickly by air movement, speeding up diffusion of more water vapour out of the leaf. Secondly, it increases the temperature of leaf and thus affects the rate of transpiration. Outline the effect of temperature, light intensity and carbon dioxide concentration on the rate of photosynthesis. the contents of the leaf are less dilute). Test those hypotheses by plotting light intensity versus photosynthesis rates for four plant species. An increase in light intensity increase the rate of transpiration because the stomatal pores are only open for water to leave the leaf when it is light. At the start of the experiment, in darkness, the difference between apk1b-1 mutant and control mean stomatal conductances was not significant. Different plants also vary in the rate of transpiration and in the regulation of stomatal opening. Transpiration Introduction Most of the water a plant absorbs is not used for a plant's daily functioning. (iv) The Light Saturation Point of Photosynthesis: The light intensity beyond which the light response curve plateaus is called the light saturation point of photosynthesis. Greenhouse design/operation and light intensity. describe an experiment estimating the rate of transpiration using a potometer. Both increased at higher light intensities but mean apk1b-1 conductance remained lower than controls throughout the experiment. - Why does it happen? chapters 20-22, 30. Decrease light=less transpiration. Water is conserved when the guard cells are closed. If you need explanations as to why, then: 1. It, therefore, undergoes refraction while entering from one layer into another. We do a quick assessment of the damage to be able to take the right actions. Itchiness and burning sensation after waxing is a sign of allergy reaction. If light intensity is low then photosynthesis will be depressed: under these conditions it makes sense to close the stomata to conserve water. Within species there are strong linear relationships between nitrogen and both RuBP carboxylase. The rate of photosynthesis can either increase or decrease depending on the change in the limiting factor. The plants grew to have a shade avoidance-like morphology which enabled them to (almost) reach the LED lights. dailyscript. Different plants also vary in the rate of transpiration and in the regulation of stomatal opening. The color of the assay solution indicated the concentration of hydrogen peroxide. Through an overview of the components of the hydrologic cycle and the important roles they play in the design of engineered systems, students' awareness of the world's limited fresh water resources is heightened. It is a mobile nutrient within the soil, meaning it is prone to movement within the soil. Light intensity has an important role on rate of transpiration. Outline the effect of temperature, light intensity and carbon dioxide concentration on the rate of photosynthesis. Different plants also vary in the rate of transpiration and in the regulation of stomatal opening. rfgII LIVINGSTON-LIGHT INTENSITY AND TRANSPIRATION 4I9 is exhibited in certain of the transpiration graphs of Publ. Photosynthesis, Respiration and Fermentation Plants are photosynthetic, which means that they produce their own food from atmospheric CO2 using light energy from the sun. light intensities, as light intensity increases so does the rate of photosynthesis, so light intensity is the limiting factor. D —The more current you put through the gel, the faster the DNA will migrate. Some of this energy is used to. Text for 'Transpiration - Water Movement through Plants' Tracy M. * Most of the factors that result in a change in transpiration rate are linked to diffusion. 1 mL pipette, clear plastic tubing, syringe, plant cutting (2-3 week old bean seedlings), ring-. This helps minerals and nutrients move up the plant from the roots. You know that the photosynthesis process happens in the daylight. transpiration. Increase light by surrounding plants with reflective materials, a white background, or supplemental lights. Four suggested plant species are. Variable-Manipulated variable: Light intensity-Responding variable : Time taken for the air bubble to travel 10 cm. Most of the time, when the intensity of light is high, you will get. asked May 19 '17 at 5:29. This series have 1 head to 16 heads COB light, it will. When light intensity increases, the guard cells take up water by osmosis and become turgid which causes the stomata to. Celebrating Prezi’s teacher community for Teacher Appreciation Week. Through an overview of the components of the hydrologic cycle and the important roles they play in the design of engineered systems, students' awareness of the world's limited fresh water resources is heightened. J inan Cao has been dissecting the nature of the greenhouse effect and a key calculation that I normally just accept without questioning. Soil forms layers or horizons, roughly parallel to the earth’s surface, in response to five soil forming factors. Humidity - When the atmosphere is saturated with water vapour, little more can be absorbed from the plants, and transpiration will be reduced. Plants that receive plenty of blue light will have strong, healthy stems and leaves. 04% carbon dioxide concentration food carbohydrate fat protein P. This increases the rate of glucose production and storage in guard cells. The stomata in the lower epidermis of the leaves are made up of guard cells. It also increases the capacity of the air to absorb more water. Green plants exist only where there is an adequate supply of sunlight. The stomata are closed. At the start of the experiment, in darkness, the difference between apk1b-1 mutant and control mean stomatal conductances was not significant. Recommend Documents. In this experiment, the light intensity is changed, by decreasing the light intensity. To be more precise transpiration is inevitable if the total eco system is to exist. Other factors such as light intensity and carbon dioxide concentration in the leaves influence the opening and the closing of stomata. The rate of photosynthesis generally changes greatly during the day. I managed to shed 15lbs and not satisfied with the result so i increase the intensity and duration to 1. How does wind affect the transpiration rate of a plant? Conclusion Based on our results, our hypothesis, if the leaves are exposed to a windy environment, then the transpiration rate will increase, was accepted. Wind increases the ethylene production in barley and rice. Becker, Ph. CAPE Unit 2 Labs; BIO LABS Author: Alex Clarke. Curves I and II are the same between 1 – 7 units of light intensity because the carbon dioxide concentration is the same for both samples, it is the limiting factor, and the only slight difference is the change in temperature. Since the middle of the 19th century, the level of carbon. For example, India's population of one billion people produces more carbon dioxide just by breathing than is produced by all the coal-burning power plants in the United States. In addition, blue light regulates the opening of stomata, which are the tiny openings on leaves that control both water loss and the uptake of carbon dioxide. Reaction rates generally increase with increasing reactant concentration, increasing temperature, and the addition of a catalyst. This virtual experiments require Adobe Flash. Light: The rate of transpiration is roughly proportional to the intensity of light. As the rate of photosynthesis increases, the demand for CO 2 also increases, and more stomata must open to meet the demand. How Light Affects the Stomatal Opening in a Leaf Abstract ===== My aim of this investigation was to check the affect of environmental factors affecting stomatal opening. if you have a light meter, anywhere from 2000-3000 foot candles is ideal. Question: Why does a ship rise as it enters the sea from a river?. As the light intensity increases and the air warms, the stomata open and net. ScienceProject. Light intensity was increased by 50 µmol photon m −2 s −1 every 5 minutes. The Effect of Light Intensity on the Rate of Photosynthesis in an Aquatic Plant Introduction The input variable I will be investigating is light, as light is just one of the 4 factors required in the green-plant process of photosynthesis. This is illustrated by the light saturation curves for CO2 uptake. Shipping Plants can lose leaves during shipping and storage due to water stress because of limited growing medium volume. Photorespiration results in the light-dependent uptake of oxygen and release of carbon dioxide and is associated with the synthesis and metabolism of a small molecule called glycolate. Temperature and wind velocity will increase transpiration rates because water molecules evaporate quicker (Raven, 2011). The atmospheric carbon dioxide concentration has risen from about 270 parts per million (ppm) before 1700 to about 355 ppm today. Explanation. A potometer measures how factors such as light, temperature, humidity, light intensity and wind will affect the rate of transpiration. Wind increases the turbulence in atmosphere, thus increasing the supply of carbon dioxide to the plants resulting in greater photosynthesis rates. In 1980 more CO2 was added to the atmosphere than in 2004. Rates of transpiration depends on humidity and light intensity, which varies day to day. Explain why wind effects rate of transpiration? 7. During photosynthesis in green plants, light energy is captured and used to convert water, carbon dioxide, and minerals into oxygen and energy-rich organic compounds. Hypothesis: The higher the light intensity, the higher the rate of transpiration. Vegetative stage thrives with 400 to 500 nm (e. c) stomata - CAM plants: open in dark; close in light 3) temperature -high light intensity increases temperature due to: a) absorption of radiation, especially IR; greater with darker colors b) greenhouse effect 4) transpiration -greater in high light intensity due to heat buildup, but transpiration may decrease. Does the rate depend on light intensity in the whole range of intensities examined? b. microchamber after aperiod of1 to 2 hr exposure to light in the morning. Lab 5 Overview. Increase: Removes water vapour from leaf surfaces so more water diffuses from the leaf: Light intensity: Increase: Increases the rate of photosynthesis, stomata open so that water diffuses out of. This is largely because light stimulates the opening of the stomata. What happens to the transpiration rate as light intensity increases? answer choices It increases transpiration rate.