AP BIOLOGY

Detailed explanation-1: -Potometers are of various types designed by various scientists to study and measure the rate of transpiration. Darwin’s potometer helps to demonstrate the suction force created due to transpiration.

Detailed explanation-2: -Note: The plant produces a transpiration pull in Ganong’s Potometer which causes a suction force.

Detailed explanation-3: -Darwin’s Y-shaped potometer is the simplest type of potometer used to measure the rate of transpiration. It consists of a glass tube with a side tube. A twig (fresh) is cut obliquely under water and is inserted in the side tube through a single hole cork.

Detailed explanation-4: -Investigating transpiration 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-5: -Transpiration pull is also referred as suction force and this force is used to draw the water in an upward direction from the roots to the leaves.