Question

Leaves which appear wilted in the day time and recover at night because

• A. Light is essential for photosynthesis.
• B. The stomata closes, temperature decreases, transpiration is reduced and the plant is able to absorb more water from the soil.
• C. Respiration and translocation of organic substance, both increases.
• D. The plant is inactive because of dark conditions.

Answer 1

The correct option is B The stomata closes, temperature decreases, transpiration is reduced and the plant is able to absorb more water from the soil.

Leaves which appear wilted in the day time, recover at night because the stomata close, temperature decreases, transpiration is reduced and the plant is able to absorb more water from the soil. Leaves wilt when surrounding temperature rises. It happens due to the higher rate of transpiration.

When it is night time, the outside temperature reduces, ensuring an adequate amount of water in the plant system. During the night, transpiration reduces and absorption of water from soil increases.

So, the correct answer is 'The stomata closes, temperature decreases, transpiration is reduced and the plant is able to absorb more water from the soil.'