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BIOLOGY

JAMB 2004 - Question 19

Biology 2004 JAMB Past Questions - Question 19: The opening of the stoma is controlled by the

Choose the most appropriate option for the gap .

The opening of the stoma is controlled by the

A: presence of a pore

B: increase in solute concentration in the guard cells

C: presence of guard cells

D: decrease in solute concentration in the guard cells

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Correct Answer

Explanation

B - Thesolute is glucose which is produced during photosynthesis because the guard cells have chloroplasts which bear chlorophyll for trapping light energy. part of the glucose produced is immediately disclose to form glucose solution. the solution draws water from neighbouring epidermal cells by osmosis until the guard cells are fully turgid, they draw or move away from each other resulting in the opening of the stomatal pore.