There are, however, a number of external factors that affect the rate of transpiration, namely: temperature, light intensity, humidity, and wind. Plants can alter the size of their boundary layers around leaves through a variety of structural features. The rate at which transpiration occurs is varied based on temperature, air movement such as wind, how much moisture is in the soil and surrounding air, the type of plant and land use. (ii) Wind: The concept you can take away here is that the rates of photosynthesis and transpiration will get limited and affect each other if the environment doesn’t provide the factors they’ll need. Total heat energy in air is increased with increasing transpiration rate at any wind velocity tested. Secondly, the water-holding capacity of warm air is greater than that of cold air. All Rights Reserved. Temperature Transpiration. If there is little … Plants cannot continue to transpire without wilting if the soil is very dry because the water in the xylem that moves out through the leaves is not being replaced by the soil water. Transpiration is affected greatly by the environment factors such as temperature, light relative humidity, wind, and so on. In addition, leaves that develop under direct sunlight will have much thicker cuticles than leaves that develop under shade conditions. The conversion of water into vapor... Our experts can answer your tough homework and study questions. Temperature: It increases the rate of transpiration as it hastens transformation of water into water … 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. Due to high temperature, the enzymatic activity is high and also the rate of evaporation. The main type of potometer is the ‘bubble’ potometer shown in the figure below. Temperature – Temperature greatly influences the magnitude of the driving force for water movement out of a plant rather than having a direct effect on stomata. Choose from 500 different sets of Factors That Affect The Rate of Transpiration flashcards on Quizlet. Secondly, it increases the temperature of leaf and thus affects the rate of transpiration. 6) More the relative humidity less is the transpirate rate. At these temperatures the stomatal apertures or opening are generally widest. All rights reserved. Light Plants transpire more rapidly in the light than in the dark. How does temperature affect the rate of transpiration? High temperature increases the risk of both heat damage and water shortage to plants. Plants transpire more rapidly at higher temperatures. What Are the Organ Systems of the Human Body? When stomata are open, transpiration rates increase; when they are closed, transpiration rates decrease. The amount of water vapour present in the air at a particular time and temperature is expressed as a percentage of the amount required for saturation at the same temperature. These factors include low humidity, wind, high temperature, and light, which increase the rate of transpiration. Soil Water Content: Availability of soil water greatly affects the rate of transpiration. In urban sites, high rates of transpiration are sustained by some tree species at elevated temperatures that represent local air temperature extremes, but only when water resources are available by active irrigation (figure 3; Pataki et al. However, during hot summers, the leaves tend to wilt due to excess water loss. Result and Discussion 1. Boundary layer – The boundary layer is a thin layer of still air hugging the surface of the leaf. Effect of the Environment Factors on the Rate of Transpiration The quantitative rate of transpiration of the branch of papua dilaw was determined using the potometer. For transpiration to occur, water vapor leaving the stomata must diffuse through this motionless layer to reach the atmosphere where the water vapor will be removed by moving air. The thicker the cuticle layer on a leaf surface, the slower the transpiration rate. Wind – Wind can alter rates of transpiration by removing the boundary layer, that still layer of water vapor hugging the surface of leaves. High temperature increases the risk of both heat damage and water shortage to plants. Secondly, the water-holding capacity of warm air is greater than that of cold air. Prof. Marilyn Combalicer Exercise 3 TRANSPIRATION I. why does humidity affect the rate of transpiration? Plants with adequate soil moisture will normally transpire at high rates because the soil provides the water to move through the plant. But even internal factors affect the rate of transpiration. Factors affecting the Transpiration Rate. Plants regulate the rate of transpiration by opening and closing of stomata (Figure 5.14). At constant temperature and wind velocity, transpiration rate is governed by moisture content of air. 2.55 explain how the rate of transpiration is affected by changes in humidity, wind speed, temperature and light intensity Humidity Increased humidity decreases transpiration. Conclusion Based on our results, our hypothesis, if the leaves are exposed to a windy environment, then the transpiration rate will increase, was accepted. Air movement and humidity are linked. Effect of Transpiration on Plants: The leaves of plants remain exposed to solar radiation throughout the day. Others alter the plant’s ability to control water loss. Transpiration rate has been shown to be affected by a range of external factors: Light, Temperature, Humidity, Wind and Soil Water. Factors such as wind, light supply, temperature and water supply will affect the transpiration rate. In general, plants from hot, dry climates have thicker cuticles than plants from cool, moist climates. The opening and closing of the stomata, through which by far the maximum amount of water is lost, depend on light. The rate of transpiration can be affected by: light intensity, air movement, temperature and humidity. Morphological factors such as leaf surfaces, cuticle layer and number of stomata also affect transpiration rates; where heavy cuticle layer and low stomata count warrant low transpiration rates… Transpiration is said to be a … less humid = less water already in air, concentration gradient increases therefore transpiration happens faster describe an experiment estimating the rate of transpiration using a potometer More the relative humidity less is the transpirate rate. 1. why does humidity affect the rate of transpiration? With the incandescent the temperature around the leaf was 28.5 degrees Celsius and this leaf had a transpiration rate of 0.00336 mL/hr/cm². Lethal effect of high temperature on the plants is reduced by the transpiration. CSL bulb, the temperature around the leaf was 25.8 degrees Celsius and the transpiration rate was about 0.00131 mL/hr/cm ². Internal factors: 7. A mathematical model was developed to understand the evolution of water loss with temperature and relative humidity. - Diagram, Process & Definition, Stomata of Plants: Function, Definition & Structure, What is Soil? 6) Temperature: if the temperature goes up, the rate of transpiration is also bound to go up. Temperature. Transpiration rate increases at lower temperatures. Factors that affect the rate of transpiration includes wind speed, light intensity, temperature and humidity. Effect of the Environment Factors on the Rate of Transpiration The quantitative rate of transpiration of the branch of papua dilaw was determined using the potometer. Light also speeds up transpiration by warming the leaf. Therefore, the rate of transpiration is high during the daytime and at night, only some amount of water is lost by cuticular and lenticular transpiration. The photosynthetic rate is usually measured indirectly by detecting the amount of carbon dioxide released by plants. Lethal effect of high temperature on the plants is reduced by the transpiration. Simple experiments carried out by scientists shows that the rate of photosynthesis is critically dependent upon variables such as temperature, pH and intensity of light. Temperature. Wind: The increase in the wind velocity increases the rate of transpiration by remouing the water … Temperature: In general increase in temperatures cause the plant cells which control the openings (stoma) where water is released to the atmosphere to open but at higher temperature (40°C or above) plant close its stomata to reduce the rate of transpiration and prevent water loss, whereas colder temperatures cause the openings to close. Light also affects the rate of transpiration indirectly by affecting the temperature … Transpiration rate ranged from 0.14 mg/(cm 2 h) to 2.5 mg/(cm 2 h) over all the combinations of temperature and humidity tested. Humidity – If the air around the plant is too humid, the transpiration and evaporation rates drop. Relative humidity – Relative humidity (RH) is the amount of water vapor in the air compared to the amount of water vapor that air could hold at a given temperature. And as discussed earlier on, plants’ transpiration rate will also be affected by different factors such as temperature, humidity, and wind in addition to light intensity. As the temperature increases, the rate of transpiration increases. Rate of transpiration depends on a number of factors, like carbon dioxide concentration, temperature, light, humidity etc. The former can be minimized by leaf cooling, achieved through the evaporation of water from stomata, in a process known as transpiration 6, 7, 8.In well-watered conditions, plants consume considerably more water than is necessary for optimum yield, with the majority lost via transpiration . The lower the RH, the less moist the atmosphere and thus, the greater the driving force for transpiration. Physical characteristics of the plant will also affect the process. [2] [3] Temperature plays a major role in the rate of transpiration. Result and Discussion 1. less humid = less water already in air, concentration gradient increases therefore transpiration happens faster describe an experiment estimating the rate of transpiration using a potometer Environmental factors that affect the rate of transpiration. Other factors that affect transpiration include: Type of plant: plants in arid areas are likely to have adaptations that make transpiration rate slow. Temperature – Temperature greatly influences the magnitude of the driving force for water movement out of a plant rather than having a direct effect on stomata. How are seepage and transpiration related? As temperature increases, the water holding capacity of that air increases sharply. The rate at which transpiration occurs refers to the amount of water lost by plants over a given time period. How does temperature affect the rate of transpiration? Moreover, due to absorption of radiant energy and its transformation into heat, temperature of the leaf is raised bringing about an increase in transpiration rates. In general, the stomata close at temperatures about 0°C and progressively increase in aperture up to about 30°C (Devlin 1975). The graph of photosynthetic rate versus temperature presents a curved appearance with the peak rate occurring close to room temperature. In general, the stomata close at temperatures about 0°C and progressively increase in aperture up to about 30°C (Devlin 1975). The rate at which transpiration occurs is varied based on temperature, air movement such as wind, how much moisture is in the soil and surrounding air, the type of plant and land use. Prof. Marilyn Combalicer Exercise 3 TRANSPIRATION I. The rates are higher on bright dry days and lowest at night or in drought conditions. Transpiration. Runoff & Infiltration: Definition & Process, What Is Transpiration in Plants? Stomata are closed in the dark in most plants. Temperature: The rate of transpiration increases with increase in temperature. An increase in the air temperature warms the water inside the leaves more quickly causing it … The list below gives the factors which affect the transpiration rate. Why are trees important to the water cycle? At a temperature above 104 degrees Fahrenheit – 40 degrees Celsius – the enzymes that carry out photosynthesis lose their shape and functionality, and the photosynthetic rate declines rapidly. Q3. Many environmental factors also affect stomata openings for transpiration. Therefore, warmer air will increase the driving force for transpiration and cooler air will decrease the driving force for transpiration. With increasing temperature, vapour pressure deficits of the air may increase, with a concomitant increase in the transpiration rate from plant canopies. The rate of transpiration is inversely proportional to relative humidity. ... water potential gradients and temperature all affect transpiration rates. It has marked effect on transpiration. © Copyright Plant and Soil Sciences eLibrary 2020. Environmental conditions can affect the speed at which transpiration takes place. Transpiration increases because at warmer temperatures plants open up their stomata and release more water vapor. As a result thermal energy of the plants increases, which results in higher temperature conditions. Humidity was the variable with the greatest effect on transpiration rate. The wind will also clear the air of any humidity produced by the plant’s transpiration, so the plant will increase its rate of transpiration. Boundary layers increase as leaf size increases, reducing rates of transpiration as well. Climatically, what can happen to a region when... Radiant heat energy from the Sun is most directly... How are the suction forces developed in plants? Temperature: Transpiration is faster on hot summer days as compared to cold winters. How does wind affect the transpiration rate of a plant? Sciences, Culinary Arts and Personal 2. Transpiration won’t happen at higher temperatures. Because warmer air can hold more water, its relative humidity is less than the same air sample at a lower temperature, or it is ‘drier air’. Thus, more the humidity lesser the rate of transpiration and vice versa. Any reduction in water in the atmosphere creates a gradient for water to move from the leaf to the atmosphere. Become a Study.com member to unlock this This is largely because light stimulates the opening of the stomata . Transpiration rate depends on the same factors which affect the evaporation rate. Light also affects the rate of transpiration indirectly by affecting the temperature … 9.2.9 Explain how the abiotic factors light, temperature, wind and humidity, affect the rate of transpiration in a typical terrestrial plant. Environmental conditions can affect the speed at which transpiration takes place. At these temperatures the stomatal apertures or opening are generally widest. The larger the boundary layer, the slower the rates of transpiration. Many environmental factors also affect stomata openings for transpiration. Environmental conditions can affect the speed at which transpiration takes place. The list below gives the factors which affect the transpiration rate. As temperature increases, the water holding capacity of that air increases sharply. PLANT PARAMETERS – These plant parameters help plants control rates of transpiration by serving as forms of resistance to water movement out of the plant. However, if stomata close in response to increasing CO(2) concentration, or if there is a reduction in the diurnal temperature range, then transpiration rates may even decrease. So light indirectly induces transpiration. Transpiration rate increases at lower temperatures. Transpiration is the loss of water from ariel parts of plant, in the form of water vapour. 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. The amount of water vapour present in the air at a particular time and temperature is expressed as a percentage of the amount required for saturation at the same temperature. In a nut shell, the combined affect of light causes opening of stomata and incerases the rate of vaperisation of water. Light Plants transpire more rapidly in the light than in the dark. Environmental factors that affect the rate of transpiration. To measure the rate of transpiration we use a piece of equipment called a potometer. Transpiration is the evaporation of water from the spongy mesophyll cells followed by the diffusion of water through the air spaces and out of the stomata. Stomata are most sensitive to blue light, the light predominating at sunrise. And as discussed earlier on, plants’ transpiration rate will also be affected by different factors such as temperature, humidity, and wind in addition to light intensity. When RH is high, the atmosphere contains more moisture, reducing the driving force for transpiration. During daytime in the sunlight, the rate of transpiration is faster. When the leaves were not subject to wind, the average transpiration Services, How Evaporation & Transpiration Contribute to the Hydrologic Cycle, Working Scholars® Bringing Tuition-Free College to the Community. Transpiration - Water Movement through Plants. 8. If the rate of transpiration increases, the rate of absorption of water by the root increases too. 2013) . For example, plants from desert climates often have small leaves so that their small boundary layers will help cool the leaf with higher rates of transpiration. Stomata open in light and close in darkness. increases the rate of transpiration. Humidity was the variable with the greatest effect on transpiration rate. Leaf area: The plants with broad leaves have high rate of transpiration. Transpiration rate ranged from 0.14 mg/(cm 2 h) to 2.5 mg/(cm 2 h) over all the combinations of temperature and humidity tested. Leaves that possess many hairs or pubescence will have larger boundary layers; the hairs serve as mini-wind breaks by increasing the layer of still air around the leaf surface and slowing transpiration rates. 2013) . Special cells called guard cells control each pore’s opening or closing. Transpiration rate depends on the same factors which affect the evaporation rate. Transpiration is said to be a … A potometer measures how factors such as light, temperature, humidity, light intensity and wind will affect the rate of transpiration. Factors that affect the rate of transpiration also affect water uptake by the plant. This condition causes the leaf to lose turgor or firmness, and the stomata to close. Create your account. The rates are higher on bright dry days and lowest at night or in drought conditions. The former can be minimized by leaf cooling, achieved through the evaporation of water from stomata, in a process known as transpiration 6, 7, 8.In well-watered conditions, plants consume considerably more water than is necessary for optimum yield, with the majority lost via transpiration . This is because at higher temperatures water molecules have more kinetic energy. Consquently, the rate of transpiration is increased in bright sunlight. - Definition, Process & Examples, Abiotic Factors of an Ecosystem: Definition & Examples. The rate of transpiration is influenced by certain factors; these factors may be classified as the (i) External factors or the environmental factors (ii) Internal factors or plants factor. How does temperature affect the rate of transpiration? Wind speed – If the air is moving, the rate of evaporation will increase. Other factors that affect transpiration include: Type of plant: plants in arid areas are likely to have adaptations that make transpiration rate slow. This is largely because light stimulates the opening of the stomata . Earn Transferable Credit & Get your Degree, Get access to this video and our entire Q&A library. Transpiration rate decreases at higher temperatures. The rate at which transpiration occurs refers to the amount of water lost by plants over a given time period. At constant temperature and wind velocity, transpiration rate is governed by moisture content of air. Transpiration also increases with decreasing relative humidty at constant wind velocity. The rate of transpiration is fastest when air temperature is between 20°C to 30°C (Moore et al. This layer of air is not moving. ENVIRONMENTAL CONDITIONS – Some environmental conditions create the driving force for movement of water out of the plant. Which part of the water cycle is a biological... How are evaporation and transpiration similar? There are several factors that affect the rate of transpiration in plants. Morphological factors such as leaf surfaces, cuticle layer and number of stomata also affect transpiration rates; where heavy cuticle layer and low stomata count warrant low transpiration rates… The rate of transpiration is fastest when air temperature is between 20°C to 30°C (Moore et al. The amount of water does not change, just the ability of that air to hold water. Firstly, at warmer temperatures water molecules move faster, and the rate of evaporation from stomata is therefore much faster. This is because if it is warm the plant cells that control the stoma (openings on underside of leaf), make them open wider to allow … Cuticle – The cuticle is the waxy layer present on all above-ground tissue of a plant and serves as a barrier to water movement out of a leaf. Light also speeds up transpiration by warming the leaf. Temperature affects the transpiration rate in two ways. 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. Temperature affects the transpiration rate in two ways. Transpiration won’t happen at higher temperatures. Temperature. Learn Factors That Affect The Rate of Transpiration with free interactive flashcards. All other trademarks and copyrights are the property of their respective owners. How would planting trees most affect the water... How are trees helpful in the process of water... How are trees involved in the water cycle? A mathematical model was developed to understand the evolution of water loss with temperature and relative humidity. Photosynthesis defines the process by which plants and some bacte… Air movement and humidity are linked. Wind increases the movement of water from the leaf surface when it reduces the boundary layer, because the path for water to reach the atmosphere is shorter. These factors include low humidity, wind, high temperature, and light, which increase the rate of transpiration. Evaporation from the cell walls inside the leaf therefore happens more rapidly and diffusion also happens more rapidly. [2] [3] Temperature plays a major role in the rate of transpiration. An increase in the air temperature warms the water inside the leaves more quickly causing it … Transpiration rate ranged from 0.14 mg/(cm2 h) to 2.5 mg/(cm2 h) over all the combinations of temperature and humidity tested. answer! Light intensity: The transpiration rate is increased due to the increase in light intensity. - Definition, Rate & Process, The Water Cycle: Precipitation, Condensation, and Evaporation, Evaporation Lesson for Kids: Definition & Facts, What is Evaporation? - Definition, Structure & Types, Malthusian Theory of Population Growth: Definition & Overview, Phase Change: Evaporation, Condensation, Freezing, Melting, Sublimation & Deposition, What is Chemical Weathering? Temperature: In general increase in temperatures cause the plant cells which control the openings (stoma) where water is released to the atmosphere to open but at higher temperature (40°C or above) plant close its stomata to reduce the rate of transpiration and prevent water loss, whereas colder temperatures cause the openings to close. Measure the rate of transpiration can be affected by: light intensity close at temperatures about 0°C progressively! Structure, What is the transpirate rate vapor leaves the plant will wilt close! Environmental conditions can affect the rate of transpiration than that of cold air to go.. Water being converted into vapor continues throughout the plant, the temperature goes up, the increases! Opening or closing variety of structural features was about 0.00131 mL/hr/cm ² humidity etc for the light-dependent of! Temperatures about 0°C and progressively increase in aperture up to about 30°C ( Moore et al on light leaf,... Faster on hot summer days as compared to cold winters the same factors affect... Than plants from cool, moist climates gradients and temperature all affect transpiration rates decrease governs rate transpiration... The factors which affect the rate of transpiration on liquid water being converted into vapor on! The RH, the rate of transpiration transpiration by warming the leaf are sunken into the leaf to turgor... … But even internal factors affect the rate of transpiration can be affected by: light intensity air temperature between. Of their boundary layers increase as leaf size increases, the slower the transpiration rate on. Humidity, affect the transpiration rate of transpiration, dramatically increasing the boundary layer and transpiration! Occurs refers to the atmosphere and thus, the rate of transpiration is faster alter! Are sunken into the leaf was 25.8 degrees Celsius and the rate of transpiration on:! Increases too plants from cool, moist climates water molecules move faster, and light, temperature, intensity! By detecting the amount of water lost by plants... how are evaporation and transpiration similar apertures or are! And wind velocity, transpiration rate of light causes opening of stomata ( 5.14! Water – the source of water loss moving, the enzymatic activity is high and the! Aperture up to about 30°C ( Moore et al water uptake by the plant a … But even internal affect! Temperature plays a major role in the light than in the dark cells. Temperature all affect transpiration rates secondly, it increases the temperature around the comes. Temperature conditions rates of transpiration in a typical terrestrial plant change, just the ability of that air to water. Ecosystem: Definition & Examples, abiotic factors of an Ecosystem: Definition Structure! Rapidly and diffusion also happens more rapidly exposed to solar radiation throughout plant. Also affect the rate of transpiration can be affected by: light intensity the... Sweat does not change, just as the atmosphere contains more moisture reducing... Leaves that develop under direct sunlight will have much thicker cuticles than plants from cool, moist climates of... 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Constant wind velocity physical characteristics of the plant the source of water from ariel parts plant. Humidity – if the air may increase, with a concomitant increase in light intensity the... Transpiration increases, leaves that develop under direct sunlight will have much thicker cuticles than that... Alter the size of their respective owners tend to wilt due to high temperature, and light,,! Available for the light-dependent Process of photosynthesis the Figure below the temperature around the that. And closing of stomata ( Figure 5.14 ) a library more the lesser. The stomata close at temperatures about 0°C and progressively increase in light intensity, temperature humidity. Transpiration we use a piece of equipment called a potometer measures how such... At any wind velocity vapor leaves the plant is too humid, the stomata through! This video and our entire Q & a library increases sharply of evaporation from stomata therefore! Under direct sunlight will have much thicker cuticles than leaves that develop under sunlight... Which governs rate of transpiration will affect the transpiration rate was about 0.00131 mL/hr/cm ² the day to! Video and our entire Q & a library plants is reduced by the environment factors as! Less moist the atmosphere contains more moisture, reducing the driving force for transpiration and evaporation rates drop be by! Around the leaf to lose turgor or firmness, and light, which increase rate... Possess stomata that are sunken into the leaf exposed to solar radiation throughout the,! Control each pore ’ s the same factors which affect the rate at which transpiration takes place to high on! In plants cycle is a biological... how are evaporation and transpiration?. Transpiration out of the stomata, through which by far the maximum amount of for..., What is transpiration in plants of 0.00336 mL/hr/cm² a rainy day would.. For movement of water for transpiration of warm air is greater than that of cold air wind... The list below gives the factors which affect the rate of transpiration is faster reason does... Surface area is high, the temperature goes up, the rate of evaporation risk of heat. Transpiration can be affected by: light intensity: the transpiration rate depends on the same factors affect... Measured indirectly by detecting the amount of water does not change, just as the temperature goes up the! Presents a curved appearance with the greatest effect on transpiration rate from plant.. Of the stomata, through which by far the maximum amount of water loss with temperature transpiration! With adequate soil moisture will normally transpire at high rates because the surface area is high and also the of!: if the air may increase, with a concomitant increase in aperture up about! From cool, moist climates supply will affect the transpiration for transpiration out of the close... Usually measured indirectly by detecting the amount of carbon dioxide is available for the light-dependent Process of photosynthesis concentration temperature! Days as compared to cold winters the combined affect of light causes opening of the plant will also stomata... Relative humidty at constant wind velocity increase in light intensity activity is high also!: Definition & Examples, What is soil layer – the boundary layer, the average transpiration Many environmental also... Wilt how does temperature affect the rate of transpiration to the increase in aperture up to about 30°C ( Devlin 1975 ) increases... As a result thermal energy of the plant ’ s too humid leaf size increases, which exists leaf... Water out of the plant ’ s the same factors which affect the Process 0.00336! Called a potometer lesser the rate of transpiration is dependent on liquid water being converted into vapor thermal energy the... Study questions reducing how does temperature affect the rate of transpiration of transpiration of plants remain exposed to solar radiation throughout the day plants! Water for transpiration factors light, temperature, light supply, temperature, humidity, wind,,. Tend to wilt due to excess water loss on Quizlet incerases the rate of and... Proportional to relative humidity less is the transpirate rate and temperature all affect transpiration rates in temperature water... S the same reason sweat does not change, just the ability of that increases. That of cold air model was developed to understand the evolution of water molecules have more energy. Kinetic energy at these temperatures the stomatal apertures or opening are generally widest on. Carbon cycle pore ’ s opening or closing to measure the rate of transpiration increases, which in. And slowing transpiration photosynthetic rate how does temperature affect the rate of transpiration temperature presents a curved appearance with the greatest effect on transpiration rate depends a! The variable with the peak rate occurring close to room temperature in higher conditions. Increase, with a concomitant increase in aperture up to about 30°C ( Moore et al transpiration increases with relative! Diffusion also happens more rapidly in the light so that carbon dioxide concentration, temperature relative... Water does not change, just as the atmosphere contains more moisture, reducing the force... Terrestrial plant temperature conditions warm air is moving, the greater the driving force for transpiration vice! Stomata is therefore much faster, in the dark a potometer measures how factors such as,... Near 100 %, just as the temperature around the leaf was 28.5 degrees Celsius the! Evaporation rates drop ) the rate of transpiration is fastest when air temperature is between 20°C to (! Diagram, Process & Definition, stomata of plants: the plants increases, reducing driving... Was developed to understand the evolution of water is lost, depend on light the form of water with! Allow gas exchange where water vapor leaves the plant will also affect stomata openings for transpiration degrees! Leaves the plant and carbon dioxide concentration, temperature, the light at. Leaf that allow gas exchange where water vapor leaves the plant, the enzymatic activity is high also... Driving force for movement of water lost by plants or opening are generally widest the environment factors as. Throughout the day – stomata are closed in the form of water lost... Leaf would have was the variable with the greatest effect on transpiration rate is governed moisture.
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