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MODEL PAPER - 10 [2026] — Science STD 10 — Question

CBSE BoardEnglish MediumSTD 10ScienceMODEL PAPER - 10 [2026]1 Mark
MCQ
Opening and closing of stomata is due to
  • A
    Diffusion of $\mathrm{CO}_{2}$ in and out of the guard cells.
  • B
    High pressure of gases inside the cells.
  • C
    Stimulus of light in the guard cells.
  • D
    Movement of water in and out of the guard cells.
✓

Answer

(D) Movement of water in and out of the guard cells.
Explanation:
They swell up when 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.

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