Topic: Plant tissues and anatomy of root, stem, leaf· Structural Organisation in Animals and Plants

Which of the following facilitates opening of stomatal aperture ?

1. Decrease in turgidity of guard cells

2. Radial orientation of cellulose microfibrils in the cell wall of guard cells

3. Longitudinal orientation of cellulose microfibrils in the cell wall of guard cells

4. Contraction of outer wall of guard cells

Doubtly Asked 30 Oct 2026 NEET UG 2017 neet Save WhatsApp Report

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Answer: 2. Radial orientation of cellulose microfibrils in the cell wall of guard cells

Key idea: A stoma opens when guard cells become turgid and curve outward.

Guard cell walls have cellulose microfibrils arranged radially. When the cell takes in water, it can lengthen only by bulging outward (the thin outer wall stretches), and the inner thick wall is pulled away, opening the pore. Loss of turgidity closes the stoma. Longitudinal arrangement would not give this curvature. Answer: (2).

Doubtly AI · 30 Oct 2026 AI-generated · not yet verified Report

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Which of the following facilitates opening of stomatal aperture ?

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