If a live earthworm is pricked with a needle on its outer surface without damaging its gut, the fluid that comes out is
- coelomic fluid
- haemolymph
- slimy mucus
- excretory fluid
Answer
(1) coelomic fluid
Solution
The earthworm is a true coelomate (annelid); its body wall encloses a fluid-filled coelom around the gut.
⇒ A needle that pierces the body wall without damaging the gut enters the coelom, so coelomic fluid oozes out.
∵ Haemolymph is the blood of arthropods (open circulation), whereas the earthworm has a closed circulatory system,
∴ the fluid is coelomic fluid.
Answer: (1)