Assertion :Smooth muscle fibres do not appear to be striated. Reason: This is due to regular alternate arrangement of thick and thin filaments is smooth muscle fibre.

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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Assertion is incorrect but Reason is correct.

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Solution

The correct option is C Assertion is correct but Reason is incorrect.
Striated muscle cells are composed of long proteins as actin, myosin and titin and other accessory proteins. These proteins are present in thin and thick filaments, which repeat along the length of myofibril. Such "interlinking fibers structure" gives the striped appearance to striated muscles.
Smooth muscle fibers do not appear to be striated. Smooth muscles also contain actin and myosin. But structural arrangement is different in smooth muscles as "in layers or bundles of fibers".

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

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(b) Both assertion and reason are correct, but reason does not explain assertion.
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(d) Both assertion and reason are incorrect
(e) Assertion is incorrect but reason is correct.

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