Assertion :Vitamin A deficiency produces night blindness. Reason: Photosensitve pigment rhodopsin is synthessised from vitamin A.

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
Our eyes are the sense organs for vision. The light sensitive inner layer of eyeball called retina contain photoreceptors viz. rod and cone cells which convert the energy of specific wavelengths of light into action potentials of nerve fibres. Rods are sensitive even to dim light and consequently enable to see in dim light and at night. They contain a purple coloured photosensitive pigment, called rhodopsin. Rhodopsin consists of the protein scotopsin and retinas, a derivative of vitamin A which is required for proper vision and is required for the regeneration of rhodopsin after it has been exposed to light.
So, the correct answer is 'Both Assertion and Reason are correct and Reason is the correct explanation for Assertion'.

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