There are _________ hypothesis which may explain opening and closing of stomata?
Correct answer: B. Two
- A. One
- B. Two
- C. Three
- D. Four
Explanation
The two commonly taught explanations for stomatal movement are the starch-sugar hypothesis and the potassium-ion hypothesis. Both explain how changes in guard-cell solutes alter water entry and turgor, producing opening or closing. Students may choose three by counting light, CO2 and water stress as separate hypotheses, but these are factors or signals rather than the main hypotheses.
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