Question

Which one of the following is not a function of transpiration?

• A. Cooling of leaves
• B. Excretion of minerals
• C. Uptake of water
• D. Uptake of minerals

Answer 1

The correct option is B

Excretion of minerals

The correct option is B.

Explanation of the correct option:

1. Transpiration is defined as the physiological loss of water in the form of water vapor.
2. It also evaporates from the surfaces of leaves, flowers, and stems.
3. Transpiration has two main functions namely, cooling the plant and pumping water and minerals to the leaves for photosynthesis.
4. Leaves contain tiny pores called stomata where the gaseous exchange takes place via diffusion.

Explanation of the incorrect options:

Option A:

Cooling of leaves occurs as a result of transpiration.

Option C:

Uptake of water occurs by the pumping action taking place during transpiration.

Option D:

Transpiration also helps in the uptake of minerals.

Final answer: Excretion of minerals is not a function of transpiration.