WAEC Biology 2020 Papers

The set-up can measure comparatively the rate of transpiration of a single shoot of a plant under different experimental conditions. Transpiration is the process of water movement through a plant and its evaporation from aerial parts, primarily from the leaves. In the illustration, the plant shoot is enclosed in a container, and the amount of water lost from the shoot is measured. By changing the experimental conditions, such as the temperature or humidity, and measuring the transpiration rate under each set of conditions, the set-up can be used to compare the rates of transpiration under different conditions for a single shoot of a plant.