First slide

Classification of Animals

Question

All of the following are the features of sponges, except

Moderate

A

intracellular digestion
B

indirect development
C

external fertilisation
D

canal system

Solution

Fertilisation in sponges is internal and takes place in the mesohyl. Sperms produced by a sponge are carried by water current and enter the spongocoel of another sponge. Choanocytes carry the sperms into the mesohyl where fertilisation occurs.

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