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. Warm conditions, wind and bright sunlight speed up transpiration rate. 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. A potometer measures how factors such as light, temperature, humidity, light intensity and wind will affect the rate of transpiration. CO 2 is only about 0.036% of the atmosphere (and rising!) This is largely because light stimulates the opening of the stomata . More water within the plant will mean a steeper plant-to-atmosphere vapor pressure gradient and more water to transpire within a time duration. Therefore, to standardize our data, we will correct for the surface area of the leaves: 2. The main type of potometer is the ‘bubble’ potometer shown in the figure below. 1. May transpiration in plants occur during night? 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. Environmental factors that affect the rate of transpiration. 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. In strong light, the rate of transpiration is more because stomata are wide open. To measure the rate of transpiration we use a piece of equipment called a potometer. (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. We sweat to cool our internal body temperature, plants transpire. Plant Factors Affecting the Rate of Transpiration. 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. This transpiration rate is the combined rate of all the leaves working together. I = S/E+S × … In dim light or on a cloudy day the stomata are partially closed reducing the rate of transpiration. The rate of transpiration is more during the day to keep the plant cooler. 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. The change in water level over a day gives the evaporation rate from that area for that day. Light also speeds up transpiration by warming the leaf. 2. The rate of transpiration can be affected by light intensity, air movement, temperature, and humidity. 1. That's why, and that's how it helps the plant. Light Plants transpire more rapidly in the light than in the dark. 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. 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. Number of stomata per unit area of leaf is called stomatal frequency. Conclusions: Different environmental conditions have an effect on transpiration rate in plants. If leaf area is more, transpiration is faster. This is because a plant with more root surface area will absorb more water provided that soil water is available. 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. 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