Q.

The main function of protonephridia is

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a

excretion

b

osmoregulation

c

regeneration

d

respiration

answer is B.

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Detailed Solution

Protonephridia or flame cells are the excretory structures in Platyhelminthes (Flatworms, e.g., Planaria), rotifers, some annelids and the cephalochordate – Amphioxus. Protonephridia are primarily concerned with ionic and fluid volume regulation - osmoregulation.
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The main function of protonephridia is