AP BIOLOGY

Detailed explanation-1: -The increase in temperature will increase the process of conversion of water into water vapor. The relative humidity of dry air is less compared to the relative humidity inside the plant body. This provides a driving force for more transpiration to occur.

Detailed explanation-2: -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 when atmospheric pressure is low. During low atmospheric pressure, air will move out of the plant as a result of diffusion. At low pressure, the water vapour moves fast thus the rate of transpiration increases. At higher atmospheric pressure plant will lose water at slow rate.

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.