Assertion :When beetroot placed in pure water no colouration of water occurs but when placed in water saturated with benzene, it becomes red. Reason: Beetroot contain red pigments but due to the impermeability of plasma membrane, they do not come outside but as an effect of benzene, membrane cells die and water surrounding the beetroot becomes coloured.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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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
Anthocyanin is a red colour water-soluble pigment found in plant vacuoles. The membrane being lipid in nature does not allow free passage of hydrophilic or water-soluble compounds. Lipid nature of cell membrane can be destroyed with solvents like benzene. Benzene treated beetroots leak out anthocyanin pigment, while pigment is retained in untreated roots. Thus, the correct answer is option A.

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