Question

State whether the following statements are true or false .
High carbon dioxide concentrations will not cause stomata to open.

• A. True
• B. False

Answer 1

The correct option is A True

The opening of the stomata depends on the concentration of potassium ions that accumulate in the guard cells. These ions combine with malate ions that increases the osmotic concentration of potassium malate. This causes water to enter the guard cells that in turn increases the turgor pressure. Thus the stomata get opened.

During the night, the concentration of carbon dioxide increases in the substomatal cavity. Uptake of potassium ions is inhibited and thus stomatal openings get closed.

So, the given statement is true.