Question

At what time the stomatal transpiration in plants
is almost completely stopped?
(a) Morning (b) Night
(c) Evening (d) None of these

Answer 1

Answer:

• (b) night
• At Night the stomatal transpiration in plants.

Explanation:

Stomatal transpiration is the process by which water evaporates through stomata. Stomata are specialized leaf pores. They account for roughly 80 to 90 percent of total plant water loss.

• The movement of the guard cell controls respiration. When there is no light at night time, the amount of solute in the guard cell decreases, resulting in a drop in its osmotic potential. The guard cell loses water and becomes inactive, and the stomata close, causing transpiration to end.
• During the day, light causes stomata to open, increases the rate of transpiration; it also raises the temperature. Stomatal transpiration is nearly stopped in the dark(night) due to stomatal closure.
• therefore, option B is the correct answer.