Transpiration: Factors and Mechanism · NCERT Biology

In isobilateral leaves, stomata are:

  1. They become turgid and the pore opens wider
  2. The inner walls spring back to their resting shape
  3. The cellulose microfibrils snap under tension
  4. The cell wall instantly increases in thickness
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Correct answer: The inner walls spring back to their resting shape

When guard cells lose turgor and become flaccid, the elastic inner walls return to their original shape, causing the stomatal pore to close. This typically occurs at night or under water stress.

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