For a concept-based MCQ, read this case: an arthropod and a nematode are grouped together in modern discussions because both shed an outer cuticle during growth. Select the strongest explanation. (264)

Correct Answer: B

ecdysis of a cuticle

Molting or ecdysis is a key ecdysozoan character. Arthropods molt a chitinous exoskeleton, and nematodes molt a cuticle during growth. This question is designed as a comparison-based item to reduce thin-content style repetition and improve conceptual depth.