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Q.

Most numerous external apertures in earthworm are

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a

spermathecal pores

b

genital pores

c

nephridiopores

d

dorsal pores

answer is C.

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Detailed Solution

Nephridiopores are the most numerous external apertures in earthworm. From 3rd segment onwards, each segment has 200-250 nephridiopores on the entire surface of the body. 

The number of genital pores is three (two male apertures and one female genital aperture). 

The number of spermathecal pores is 4 pairs. 

Each intersegmental groove has a single dorsal pore, starting from 12th/13th segment.

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