Q. If a live earthworm is pricked with a needle on its outer surface without damaging its gut, the fluid that comes out is
A) Excretory fluid
B) Coelomic fluid
C) Haemolymph
D) Slimy mucus
Explanation
The body cavity of earthworm is true coelom (schizicoel) as it is formed by the division of mesoderm. The coelom is filled with milky, alkaline coelomic fluid, which contains different types of corpuscles. Thus, if a live earthworm is prickled with a needle on its outer surface, the coelomic fluid will come out.
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.