JAMB Biology 2007 Objective — Question 19

Question 19 of 50 from the Joint Admissions and Matriculation Board (JAMB) Biology 2007 Objective paper, with the correct answer and a full explanation.

The opening and closing of the stoma are regulated by

A. osmosisCorrect
B. diffusion
C. transpiration
D. respiration

Explanation

Guard cells absorb water by osmosis to become turgid, opening the stomata; water loss causes them to close.

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