Question

Excretion is carried out by Nephridia in
A) Cockroach
B) Amoeba
C) Earthworm
D) Human

Answer 1

The kingdom animalia consists of different phylum and classes that classified the animals according to their characteristics. Annelids are the organisms that have segmented the body and vary in excretion and reproduction process from the other organisms.

Complete answer:
To answer this question, we should know about the nephridia. The Nephridia is a tubule open to the exterior that acts as an organ of osmoregulation and excretion. This organ removes the metabolic wastes from the body of the animals. They are found in many different invertebrate lines and are of two types; Metanephridia and Protonephridia. The Metanephridia is a excretory gland that resent in many types of invertebrates like Mollusca, Arthropods, and Annelids. The Nephridia consists of a nephrostome or ciliated funnel that attaches into the coelom and extends to the nephridial duct. The nephridial duct is may be short, long, or modified depending on the organism. The duct is externally ciliated accompanied by blood vessels, and situated transversely. This nephridial duct opens to an exterior opening considered as nephridiopore.
Now, in Annelids like earthworm, the excretion in takes place through Nephridia that are arranged metamerically and the inner aperture of the nephridium found in the coele, and the outer aperture is present in the integument. The nephridium of Annelids is of two types; provisional Nephridia and permanent Nephridia. The provisional Nephridia are temporary structure that appear one the permanent Nephridia start developing. The permanent Nephridia is found in the adult Annelids or Earthworm.

Thus, the correct option is ‘C’. Earthworm.

Note: The Molluscs also comprise Nephridia but there it functions as osmoregulation. Osmoregulation is a process in maintaining the amount of water in the interior and exterior part of the body.