The rate of transpiration can be affected by light intensity, air movement, temperature, and humidity. This transpiration rate is the combined rate of all the leaves working together. Plants transpire more in sunny and hot days due raise in temperature because of this plants transpire as water evaporates rapidly. Plant Factors Affecting the Rate of Transpiration. CO 2 is only about 0.036% of the atmosphere (and rising!) When the relative humidity in a plant's environment rises, its rate of transpiration lowers, and a decrease in humidity causes the transpiration rate to rise. More water within the plant will mean a steeper plant-to-atmosphere vapor pressure gradient and more water to transpire within a time duration. 2. This is largely because light stimulates the opening of the stomata . Unfortunately, much more water leaves the leaf than CO 2 enters for three reasons: H 2 O molecules are smaller than CO 2 molecules and so they move to their destination faster. The main type of potometer is the ‘bubble’ potometer shown in the figure below. (b) Humidity of the atmosphere: If the air outside is humid the rate of transpiration is reduced, since the outward diffusion of internal water vapour is affected. Since measurements were taken every 10 minutes for an hour, the total cumulative transpiration at the end of the 60 minute period will be the transpiration rate per hour. In dim light or on a cloudy day the stomata are partially closed reducing the rate of transpiration. This is because a plant with more root surface area will absorb more water provided that soil water is available. For a more detailed answer read on: Transpiration is when water goes into the roots, goes up via the xylem, and eventually goes out the stomata. Number of stomata per unit area of leaf is called stomatal frequency. We sweat to cool our internal body temperature, plants transpire. Air that is humid does not accept water vapor easily, and drier air makes it easier for a plant to release water by evaporation through the stomata on its external surfaces. Transpiration is carried in leaves where stomata opens passage for carbondioxide and oxygen during photosynthesis. In strong light, the rate of transpiration is more because stomata are wide open. If leaf area is more, transpiration is faster. A potometer measures how factors such as light, temperature, humidity, light intensity and wind will affect the rate of transpiration. Environmental factors that affect the rate of transpiration. Light Plants transpire more rapidly in the light than in the dark. The change in water level over a day gives the evaporation rate from that area for that day. Conclusions: Different environmental conditions have an effect on transpiration rate in plants. Warm conditions, wind and bright sunlight speed up transpiration rate. 1. The rate of transpiration is more during the day to keep the plant cooler. However, the rate of transpiration per unit area is more in smaller leaves than in larger leaves due to higher number of stomata in the small leaf. I = S/E+S × … 1. That's why, and that's how it helps the plant. Question Date: 2008-11-26: Answer 1: Plants that live in extremely hot and arid climates often keep their stomata closed during the day, to reduce the amount of water that is lost in transpiration, and open it during the cooler and more humid nighttime. Therefore, to standardize our data, we will correct for the surface area of the leaves: 2. If we had run this experiment with fewer leaves, the rate would be lower; if we had run it with more leaves, it would be higher. May transpiration in plants occur during night? Light also speeds up transpiration by warming the leaf. To measure the rate of transpiration we use a piece of equipment called a potometer. 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