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Structural Organisation in Animals

Dorsal pores ...

Question

Dorsal pores of Earthworm do not occur in the region of

A

First eleven and last annulus

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B

14-16 annuli

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C

100-110 annusli

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D

26-40 segments

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Solution

The correct option is A First eleven and last annulus
In earthworm, minute dorsal pores are present one in each inter segmental groove in the mid dorsal surface after the 12 segment to the last 2 nd segment. Coelomic fluid released out through these pores kills harmful microbes such as bacteria.
So, the correct answer is 'First eleven and last annulus'.

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