Question

Opening and closing of stomata is due to ______.

Options

• High pressure of gases inside the cells.

• Movement of water in and out of the guard cells.

• Stimulus of light in the guard cells.

• Diffusion of CO₂ in and out of the guard cells.

Answer 1

Opening and closing of stomata is due to Movement of water in and out of the guard cells.

Explanation: 

They swell up when water enters guard cells due to water movement. The pore at the stomata is now open. The stomata close when they dry out and become flaccid.