Question

State the main function of: Guard cells.

Answer 1

Guard cells:

1. Guard cells are kidney-shaped structures that surround the stomatal openings.
2. These are specialized plant cells that are used to control exchange of gases in the epidermis of leaves, stems and other organs.

Function of guard cells:

1. The guard cells surround each stoma for their protection.
2. They are the cells that regulate the rate of transpiration by opening and closing of stomata.
3. The guard cells swells up and open the stomata for the exchange of gases when the plant has an excess of water.
4. When the guard cells are flaccid, the stomata remain closed, inhibiting exchange of gases in dry conditions.