Question

Fill in the blanks (A, B, C and D) from the characters given (1 to 6) and choose the option containing the correct matches.
I. Phylum Echinodermata are ...A....
II. Phylum Mollusca has a ...B....
III ....C... of Echinoderms is its distinctive character.
IV Echinodermata got their name from ...D....
Given characters
l . radially symmetrical
2. larvae
3. endoskeleton of calcareous ossicles
4. water vascular system
5. radula
6. mantle cavity

• A. A-1, B-6, C-4, D-3
• B. A-1, B-4, C-3, D-2
• C. A-1, B-5, C-3, D-2
• D. A-1, B-2, C-5, D-6

Answer 1

The correct option is A A-1, B-6, C-4, D-3

Echinoderms are radially symmetrical with a distinctive water vascular system. They got their names because of the presence of calcareous ossicles present as an endoskeleton that gives them a spiny body.
Molluscs have a mantle cavity. Mantle or pallium is a fold of the dorsal body wall that almost covers the body. It encloses a space, called the mantle cavity.