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Question

Assertion :A plant cell shrinks in hypertonic solution. Reason: In hypertonic solution, water moves out of the cells due to plasmolysis.

A
Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
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B
Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
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C
Assertion is correct but Reason is incorrect
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D
Both Assertion and Reason are incorrect
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Solution

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
The behaviour of the plant cells or tissues with regard to water movement depends on the surrounding solution. When the cell or tissue is placed in a hypertonic solution, water moves out; it is first lost from the cytoplasm and then from the vacuole. The water when drawn out of the cell through diffusion into the extracellular(outside cell) fluid causes the protoplast to shrink away from the walls. The cell is said to be plasmolysed.
So, the correct answer is 'Both Assertion and Reason are correct and Reason is the correct explanation for Assertion'.

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