Question

If a live earthworm is pricked with a needle on its outer surface without damaging its gut, the fluid that comes out is

• A. coelomic fluid
• B. haemolymph
• C. slimy mucus
• D. excretory fluid

Answer 1

The correct option is A coelomic fluid

Earthworm has true coelom. A fluid filled cavity which is lined by the mesoderm and is present between the gastrointestinal tract and body wall is called a true coelom. The fluid present inside the coelom is called coelomic fluid. Thus when pricked with a needle on its outer surface without damaging the gut, the fluid that comes out is the coelomic fluid. Coelomic fluid is alkaline and milky. The fluid that runs in the circulatory system of cockroaches is called haemolymph