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Question
Assertion :Setae are absent in clitellum. Reason: Setae help in locomotion.
Assertion :Setae are absent in clitellum. Reason: Setae help in locomotion.
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Solution
The correct option is B Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
Except the first, the last and clitellar segments of earthworm, each
segment bears a ring of tiny curved, chitinous structures known as setae
or chaetae. They are embedded in the skin. Each seta (singular .of
setae) lies in a setal sac, which is a small pit in the skin. the sac
has special muscles to move the seta out or in and to bend it forward or
backward. The setae hold the substratum firmly. Thus, they help in the
locomotion.
So, the correct answer is 'Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion'.
Except the first, the last and clitellar segments of earthworm, each
segment bears a ring of tiny curved, chitinous structures known as setae
or chaetae. They are embedded in the skin. Each seta (singular .of
setae) lies in a setal sac, which is a small pit in the skin. the sac
has special muscles to move the seta out or in and to bend it forward or
backward. The setae hold the substratum firmly. Thus, they help in the
locomotion.
So, the correct answer is 'Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion'.
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