Opening of the stomata:
A) occurs during prolonged periods of drought.
B) occurs when there is a high concentration of carbon dioxide in the leaf.
C) is under hormonal control.
D) is triggered by darkness.
E) is controlled by the changes in shape of the companion cells.

Question

Quizplus · Accepted Answer

The opening of stomata is primarily under hormonal control, particularly by the hormone abscisic acid (ABA), which regulates the opening and closing in response to environmental conditions.

Opening of the Stomata