Question

Fill in the blanks from the given characters with respect to A , B, C and D and choose the correct option.
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, 0-2
• 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 but got their names because of the presence of calcareous ossicles present as an endoskeleton that gives a spiny body.
Molluscs have a mantle cavity. Mantle or pallium is a fold of a body wall that leaves between itself the main body, mantle cavity.