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Question

Which factor does not contribute to stomatal opening ?

A
Light
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B
Low pH
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C
Reduced CO2
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D
Water
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Solution

The correct option is B Low pH
Light induces stomatal opening as photosynthesis takes place through it.
Absorption of water by guard cells causes them to swell and open up the stomatal pore.
Low or reduced Carbon dioxide causes stomata to open up so more of it can be absorbed for the synthesis of food.
pH has no significant contribution to the opening or closing of stomata.
So the correct answer is 'Low pH'.

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