CBSE Class 10 Science 2023 Delhi Set 1

Question : 9 of 39

Marks: +1, -0

Opening and closing of stomata is due to:

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 ${\CO}_2$ in and out of the guard cells.

Solution:

By water movement in guard cells, they swell up when water moves in. This opens the stomatal pore. When they lose water and become flaccid, the stomata close.

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