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Science — CBSE Class 10 board question

Q1. [1]
Opening and closing of stomata is due to :
  1. (a) High pressure of gases inside the cells.
  2. (b) Movement of water in and out of the guard cells.
  3. (c) Stimulus of light in the guard cells.
  4. (d) Diffusion of CO₂ in and out of the guard cells.
Previously asked in CBSE board exam
2023 31/4/1 Q9
Generated by claude-sonnet-4-6 · 2026-06-11 09:50 · grounding rag
Model Answer

(b) Movement of water in and out of the guard cells.

Explanation

When guard cells absorb water, they become turgid and stomata open; when they lose water, they become flaccid and stomata close. This is the standard NCERT explanation for stomatal movement.

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