EVERYDAY SCIENCE

Detailed explanation-1: -∙ Nephridia are the tubular excretory structures present in earthworms and other annelids. ∙ They perform functions similar to the kidney and help in removing waste products out from the body.

Detailed explanation-2: -The nephridium (plural nephridia) is an invertebrate organ, found in pairs and performing a function similar to the vertebrate kidneys (which originated from the chordate nephridia). Nephridia remove metabolic wastes from an animal’s body. Nephridia come in two basic categories: metanephridia and protonephridia.

Detailed explanation-3: -(i) Nephridia are segmentally arranged excretory organs present in earthworms. (ii) On the basis of their location, three types of nephridia are found in earthworms.

Detailed explanation-4: -nephridium, unit of the excretory system in many primitive invertebrates and also in the amphioxus; it expels wastes from the body cavity to the (usually aquatic) exterior.

Detailed explanation-5: -The excretory organs are not well developed in the lower organisms. Nephridia are segmentally arranged excretory organs present in annelids like earthworms. On the basis of their location, three types of nephridia are found in earthworms. They are: