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Q.

Excretory structures in rotifers are

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a

flame cells

b

interstitial cells

c

dieter cells

d

stinging cells

answer is A.

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Detailed Solution

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Protonephridia or flame cells are the excretory structures in Platyhelminthes (Planaria), rotifers, some annelids and the cephalochordate (Amphioxus). Protonephridia are primarily osmoregulatory and secondarily excretory in function.

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