CBSE Class 10 Science 2023 Delhi Set 1

Question : 9

Total: 39

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 CO2 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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