First slide

Classification of Animals

Question

Which of the following is not true about sponges?

Easy

A

Fertilisation is internal
B

Development is direct
C

Sexes are not separate
D

All are aquatic

Solution

The development in sponges is indirect and includes a larval stage (e.g., amphiblastula, parenchymula) which is morphologically distinct from the adult. All sponges are aquatic. Most of them are marine; some (e.g., Spongilla) live in freshwater.

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