AP BIOLOGY

Detailed explanation-1: -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.

Detailed explanation-2: -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.

Detailed explanation-3: -As the humidity of the air surrounding the plant rises, it will make the transpiration rate to fall. This means that epidermis that has to do with plants can prevent loss of water and increase the water potential.

Detailed explanation-4: -At high atmospheric humidity, transpiration is low. This is because the rate of transpiration is directly proportional to the saturation deficit. It is dependent on the gradient of vapor pressure. Thus, the higher the humidity, the lower the rate of transpiration.