Question

explain the process of closing and opening of stomata.

Answer 1

they give out excess water released in the process of respiration during night along with carbon dioxide. opening and closing of stomata is controlled by concentration of solutes in the guard cell . guard cells become turgid due to water accumlation in them which results in the opening of the guard cells.

Answer 2

The opening and closing of the pore is a function of the guard cells. The guard cells swell when water flows into them, causing the stomatal pore to open. Simillarly the pore closes if the guard cells shrink