Assertion :Non-myelinated nerve fibres do not possess nodes of Ranvier. Reason: This is due to the absence of nissl's bodies in node of Ranvier.

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 C Assertion is correct but Reason is incorrect
Myelin sheath a lipid rich insulating layer which covers some nerve fibres of nerve tissue. Such fibres are called myelinated or medullated nerve fibres, Each myelinated nerve fibre shows constrictions at regular intervals called nodes of Ranvier which result from interruption in the myelin sheath at those places. Non- myelinated nerve fibres are not covered by any myelin sheath, consequenently no nodes of Ranvier are present in them.
So, the correct answer is 'Assertion is correct but Reason is incorrect'.

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