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

Grass leaves curl inwards during very dry weather. Select the most appropriate reason from the following :

1. Closure of stomata

2. Flaccidity of bulliform cells

3. Shrinkage of air spaces in spongy mesophyll

4. Tyloses in vessels

Doubtly Asked 30 Oct 2026 NEET UG 2019 neet Save WhatsApp Report

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Answer: 2. Flaccidity of bulliform cells

Grass leaves have large thin-walled bulliform (motor) cells in the upper epidermis.

In dry weather water is lost, the bulliform cells become flaccid and the leaf curls inwards, which reduces transpiration. Stomatal closure does not roll the leaf, and tyloses block old xylem vessels. Option 2 is correct.

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

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Grass leaves curl inwards during very dry weather. Select the most appropriate reason from the following :

1 answer

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