Q. If an earthworm is left in 40% KOH solution for a long time, which part would be left undissolved?
A) Setae
B) Spermathecae
C) Sand particles
D) Circular muscles
Explanation
Setae are S-shaped rod-like, chitinous structures.
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.