Question

The opening and closing of stomata depend on the following:

• A. Concentration of oxygen in the atmosphere.
• B. Temperature of the atmosphere.
• C. Presence of water in guard cells.
• D. Concentration of carbon dioxide in the atmosphere.

Answer 1

The correct option is C Presence of water in guard cells.

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. Similarly, the pore closes if the guard cells shrink when water flows out from the guard cells.