AP BIOLOGY

Detailed explanation-1: -A decrease in which factor normally causes transpiration rate to increase? Solution : When the light intensity is reduced the stomata are partially closed and the transpiration is reduced.

Detailed explanation-2: -As the relative humidity of the air surrounding the plant rises the transpiration rate decreases. It is easier for water to evaporate into dryer air than into more saturated air. Increased movement of the air around a plant will result in a higher transpiration rate.

Detailed explanation-3: -The rate of transpiration Increases with the intensity of sunlight, high temperature, dry air, the velocity of wind, the high water content of the leaf. The rate of transpiration decreases with the closure of stomata, high humidity, high atmospheric carbon dioxide level, the low water content of leaf, shedding of leaf.

Detailed explanation-4: -The transpiration rate is inversely proportional to the humidity in air. High humidity reduces the outward diffusion of water through the stomata. As a result, less water is lost, and lower transpiration rates are observed.

Detailed explanation-5: -When the relative humidity is high, the atmosphere contains more moisture. This lowers the driving force for transpiration. Lower relative humidity levels correspond to less moisture in the atmosphere and thus a higher driving factor for transpiration.