First slide

Classification of Animals

Question

Which of the following statement is correct without exception?

Easy

A

All sponges have calcareous spicules.
B

All sponges undergo only sexual reproduction.
C

All sponges are aquatic organisms.
D

All sponges are radially symmetrical.

Solution

All sponges are aquatic organisms.
Some of the sponges are made of siliceous spicules or spongin fibres too.
Sponges undergo both sexual and asexual reproduction.
Most of the sponges are asymmetrical and few are radially symmetrical.

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