Q. What external changes are visible after the last moult of a cockroach nymph?
A) Mandibles become harder
B) Anal cerci develop
C) Both fore wings and hind wings develop
D) Labium develops
Explanation
[Solution from source] Cockroach nymphs resemble adults but lack wings; wing pads grow with successive moults and fully formed fore wings (tegmina) and hind wings appear after the last moult. Mouthparts and anal cerci are already present in nymphs. Answer (3).
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.