Question

Pick up the correct match.

Common names	Class
A. Star fishes	I. Ophiuroidea
B. Brittle stars	II. Holothuroidea
C. Sea urchins	III. Asteroidea
D. Sea cucumbers	IV. Echinoidea

• A. A - II, B - III, C - I, D - IV
• B. A - III, B - II, C - I, D - IV
• C. A - III, B - I, C - II, D - IV
• D. A - III, B - I, C - IV, D - II

Answer 1

The correct option is D A - III, B - I, C - IV, D - II

Star fishes are the marine invertebrates. They belong to the phylum Echinodermata and the class Asteroidea. Their body is composed of a central disc. They have at least five arms. Some of the species have a smooth body while certain species have spiny bodies. The organism has tube feet which help the starfish to move underwater by creating hydraulic pressure.

Ophiothrix is a large genus of brittle stars. They belong to the class of Ophiuroidea. They are found in oceans and deep waters. They have a central disc shaped body. There is presence of mouth below the disc with jaw plates.

Sea urchins is a species of marine invertebrates. They belong to the family of Echinidae and class Echinoidea. They are found in deep waters. They have elongated and oval shaped body.

Cucumaria is commonly known as sea cucumber. They belong to the class Holothuroidea. They have elongated body. They have leathery body. They are found in the depth of the oceans and feed on the particles of algae and other marine organisms.

Thus, the correct answer is option D.