Question

Rate of transpiration and stomatal movement are measured respectively by

• A. porometer and potometer
• B. potometer and porometer
• C. potometer and tensiometer
• D. hygrometer and porometer

Answer 1

The correct option is B potometer and porometer

A potometer can be used to measure the rate of transpiration that is proportional to water uptake. But 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.

A porometer measures the stomatal conductance or resistance. It is an instrument for measuring the area of the stomatal openings of a leaf by the amount of a gas passing through a given area of it.