Question

Why stomata of most of the plants become flaccid during night​

Answer 1

Explanation:

Stomata close when the guard cells lose water and become flaccid. This occurs because potassium ions move back out of the guard cell, followed by water that lowers the pressure in the guard cell. POP-UP –Many plant leaves have stomata only on their lower surface to help avoid water loss.

Answer 2

Answer:

The immediate cause of the opening or closing of the stomata in a change in the turgitdity of the guard cells When the guard cells lose turgor, due to water loss the elastic inner walls regain their original shape , the guard cells become flaccid and the stomata closes.