Q.

Setae of earthworm are

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a

L-shaped and are present on the intersegmental grooves

b

S-shaped and are present on the intersegmental grooves

c

L-shaped and are present in the middle of the segments

d

S-shaped and are present in the middle of the segments

answer is D.

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Detailed Solution

In each body segment, except the first, last and clitellar segments, there are rows of S-shaped setae, embedded in the epidermal pits in the middle of each segment. Setae can be extended or retracted. Their principal role is in locomotion.

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