First slide

Classification of Animals

Question

Which of the following is not true about sponges?

Easy

A

Most of them are asymmetrical.
B

The cells are arranged as loose cell aggregates.
C

Some division of labour occurs among the cells.
D

The cells performing the same function are arranged into tissues.

Solution

In sponges, the cells are arranged as loose cell aggregates, i.e., they exhibit cellular level of organisation (not tissue level). Some division of labour (activities) occur among the cells. Tissues are absent.

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