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Q.

Following are the statements about prostomium of earthworm.
(a) It serves as a covering for mouth.
(b) It helps to open cracks in the soil into which it can crawl.
(c) It is one of the sensory structures.
(d) It is the first body segment.
Choose the correct answer from the options given below.

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a

(b) and (c) are correct

b

(a), (b) and (c) are correct

c

(a), (b) and (d) are correct

d

(a), (b), (c) and (d) are correct.

answer is B.

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Detailed Solution

Anterior end consists of the mouth and the prostomium, a lobe which serves as a covering for the mouth and as a wedge to force open cracks in the soil into which the earthworm may crawl. The prostomium is sensory in function. The first body segment is called the peristomium (buccal segment) which contains the mouth.

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Following are the statements about prostomium of earthworm.(a) It serves as a covering for mouth.(b) It helps to open cracks in the soil into which it can crawl.(c) It is one of the sensory structures.(d) It is the first body segment.Choose the correct answer from the options given below.