Question

A nephridium of an earthworm removes waste materials directly from the

• A. Gut
• B. Coelom
• C. Lymph
• D. Blood

Answer 1

Answer: (B)

Coelom

Nephridium occurs in pairs in the invertebrates. It performs the same function as that of the kidneys in the vertebrates and removes the metabolic wastes from the animal's body. Earthworms have metanephridia which are made up of a ciliated funnel that opens into the body cavity or coelom and is connected to a duct which may be glandular, folded or expanded opening into the organisms exterior. The metabolic wastes are therefore removed directly from the coelom.