Assertion :Smooth muscle fibres do not appear to be striated. Reason: Striations occur due to regular alternate arrangement of thick and thin filaments.

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
Smooth muscles fibres are non- striated cells because they contain a large proportion of thin filament than thick filaments but striation occur due to regular alternate arrangement of thick and thin filaments.
Since smooth muscles have more thin filaments, the alternate arrangent of thick and thin filament is not possible and hence are unstriated.
So the correct answer is 'Both Assertion and Reason are correct Reason is the correct explanation for Assertion'.

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