Q. In which one of the following, the genus name, its two characters and its phylum are not correctly matched, whereas the remaining three are correct ?
A) Periplaneta – (a) jointed appendages, (b) chitinous exoskeleton – Arthropoda
B) Pila – (a) body segmented, (b) mouth with radula – Mollusca
C) Asterias – (a) spiny skinned, (b) water vascular system – Echinodermata
D) Sycon – (a) pore bearing, (b) canal system – Porifera
Explanation
[Solution from source] Pila (apple snail) is a mollusc with a radula, but its body is unsegmented, so the pair given for it is wrong. Periplaneta (jointed appendages, chitinous exoskeleton), Asterias (spiny skin, water vascular system) and Sycon (pores, canal system) are correctly matched. Answer (2).
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.