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Question
Assertion :Water absorption in plants is reduced by lowering O2 tension. Reason: The accumulation of CO2 reduce water absorption in plants.
Assertion :Water absorption in plants is reduced by lowering O2 tension. Reason: The accumulation of CO2 reduce water absorption in plants.
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Solution
The correct option is B Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion.
For water absorption from the soil, plant roots also need energy and this energy is provided by respiration. If oxygen will not be present in the soil, root cells will not be able to perform respiration and hence, no energy will be released to aid water absorption. So, water absorption is reduced by lowering oxygen tension. Hence, the assertion is correct.Accumulation of CO2 reduces water absorption by roots because CO2 increases the viscosity of the protoplasm of the cells and this results in decreased permeability of the root cells due to which water absorption is reduced. Hence, the reason is correct.So, both assertion and reason are correct but the reason is not the correct explanation for the answer.
For water absorption from the soil, plant roots also need energy and this energy is provided by respiration. If oxygen will not be present in the soil, root cells will not be able to perform respiration and hence, no energy will be released to aid water absorption. So, water absorption is reduced by lowering oxygen tension. Hence, the assertion is correct.
Accumulation of CO2 reduces water absorption by roots because CO2 increases the viscosity of the protoplasm of the cells and this results in decreased permeability of the root cells due to which water absorption is reduced. Hence, the reason is correct.
So, both assertion and reason are correct but the reason is not the correct explanation for the answer.
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