Question

Study the following and choose the correct pair.

Class	Feature	Example
A. Cephalopoda	Closed circulatory system	Pinctada
B. Echinoidea	Aristotle's Lantern	Sea-Urchin
C. Tentaculata	Cnidoblasts	Pleurobrachia
D.Hexactinellida	Siliceous spicules	Venus flower basket

• A. B, D
• B. A, D
• C. C, D
• D. A, C

Answer 1

The correct option is A B, D

Cephalopods are the only mollusc that has closed circulatory system. Option A is mismatch as Pinctada belongs to class bivalvia. The compex dental apparatus of Echinoidea is termed as Aristotle's lantern.
Option B is correct match as sea-urchins are echinoderms.
Option C is mismatch as Tentaculata is a class that includes comb jellies; Pleurobrachia is common genus of this class but Cnidoblasts are the explosive cells that belong to phylum Cnideria.
Hexactinellida is a class of sponges that is characterized by presence of silicious spicules as the structural component of their skeleton.
Venus' flower basket, Euplectella aspergillum, is a hexactinellid sponge. Option D is correct match. Options B and D are correct matches.