Question

Among the following, what is used to check the rate of transpiration?

• A. Barometer
• B. Potometer
• C. Hygrometer
• D. Galvanometer

Hint:

A potometer is a specialized instrument used to measure the rate of water uptake by plants, which is closely linked to the rate of transpiration. It works by monitoring the movement of water through a plant's xylem under controlled conditions.

Answer 1

The Correct Option is B

Step 1: Understand Transpiration.
Transpiration is the process by which plants lose water through their leaves, stems, or other parts. To measure the rate of transpiration, a device called a potometer is commonly used. Step 2: Analyze Each Option.
Option (1): Barometer — Incorrect, as a barometer measures atmospheric pressure, not transpiration.
Option (2): Potometer — Correct, as a potometer is specifically designed to measure the rate of water uptake by plants, which is directly related to transpiration.
Option (3): Hygrometer — Incorrect, as a hygrometer measures humidity, not transpiration.
Option (4): Galvanometer — Incorrect, as a galvanometer measures electrical current, not transpiration. Step 3: Final Answer. $$ (2) \mathbf{\text{Potometer}} $$