Q83 of 525 Page 254

What is the skeleton of sponges made up of?

The body of sponges is supported by a skeleton made up of spicules or spongin fibres.

Spicules are formed of calcium carbonate and silica.


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81

Name a fresh water sponge?

 82

Name the following:

(a) Cavity present in the body of sponges.


(b) Cavity present in the body of cnidarians

 84

Name the following :

(a) Simplest sponges;


(b) Commonly known as bath sponge.

 85

Write down two unique characters of Porifera.