Q.

Forests of nephridia in Pheretima are

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a

typical nephridia present in 1st, 2nd and 3rd segments

b

pharyngeal nephridia present in 4th, 5th and 6th segments

c

septal nephridia present in 16th, 17th , 18th  segments

d

integumentary nephridia present in 14th,  15th,  16th  segments

answer is A.

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Detailed Solution

In each of the 14th, 15th and 16th clitellar segments of Pheretima, 2000 to 2500 integumentary nephridia are present, so these segments are called forests of integumentary nephridia.

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