Multiple choice

Increase in CO2 concentration around leaf results in

  1. partial closure of stomata

  2. complete closure of stomata

  3. opening of stomata

  4. no effect on stomatal opening and closing
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Increased CO2 concentration around leaves triggers stomatal closure as a regulatory response. However, this is typically partial closure (Option A), not complete closure. Complete closure would severely limit photosynthesis. Opening (C) would occur in low CO2 conditions. No effect (D) is incorrect because CO2 levels directly influence stomatal aperture through feedback mechanisms.

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