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Primary function of enteronephric nephridia of Pheretima :
A
Osmoregulation
B
Excretion of nitrogenous waste
C
Respiration
D
Locomotion
Detailed Solution
Earthworm has three types of nephridia: septal, integumentary and pharyngeal.
Septal and pharyngeal nephridia open into the gut (alimentary canal); they are called enteronephric nephridia. They discharge their wastes into the gut, which helps conserve water.
Nephridia remove nitrogenous wastes (ammonia, urea) and also help in osmoregulation.
So, as per the answer key, their primary function is excretion of nitrogenous waste.
Septal and pharyngeal nephridia open into the gut (alimentary canal); they are called enteronephric nephridia. They discharge their wastes into the gut, which helps conserve water.
Nephridia remove nitrogenous wastes (ammonia, urea) and also help in osmoregulation.
So, as per the answer key, their primary function is excretion of nitrogenous waste.