AP BIOLOGY

Detailed explanation-1: -Under normal circumstances, the rate of water uptake gives a measure of the rate of transpiration . A simple potometer is a piece of capillary tubing to which a plant has been connected. The water uptake is measured by recording the time taken for a bubble in the tube to move a set distance.

Detailed explanation-2: -Potometer. A potometer can be used to measure the rate of transpiration that’s proportional to water uptake.

Detailed explanation-3: -The rate of transpiration cannot be accurately determined using a potometer because all the water that is taken by the plant is not involved in transpiration. Also, potometer only measures the rate of uptake of water.