Primary function of enteronephric nephridia of Pheretima:
- Osmoregulation
- Excretion of nitrogenous waste
- Respiration
- Locomotion
The Correct Option is B
Solution and Explanation
Enteronephric nephridia are a type of excretory organ found in earthworms and play a crucial role in eliminating nitrogenous waste products, such as ammonia and urea, from the body. These nephridia are part of the earthworm's excretory system and help maintain the osmotic balance and overall internal homeostasis of the organism.
So, the correct option is (B): Excretion of nitrogenous waste
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Concepts Used:
Earthworm
An earthworm is a terrestrial invertebrate that is to the phylum Annelida. They display a tube-within-a-tube body plan; they are externally subdivided with corresponding internal subdivision, and they usually have setae on all divisions. They arise worldwide where soil, water, and temperature allow.
Generally, earthworms are found in soil, eating a wide variety of organic matter. This organic matter incorporates plant matter, rotifers, nematodes, bacteria, living protozoa, fungi, and other microorganisms. An earthworm's digestive system runs the expanse of its body. An earthworm respires throughout its skin. It has a double transport system made up of coelomic fluid that goes within the fluid-filled coelom and a simple, closed circulatory system.
It has a nervous system - “central and peripheral”. Its central nervous system comprises two ganglia above the mouth, one on either side, connected to a nerve running along its length to motor neurons and sensory cells in each segment. Large numbers of chemoreceptors concentrate close to its mouth.
Read More: Reproductive System of Earthworm