Question

(a) How do sponges reproduce asexually ?
(b) Which system helps them in nutrition , respiration and excretion ?
(c ) How do sponges maintain their shapes ? Explain.

Answer 1

(a) Sponges reproduce asexually by budding or by special cell masses, termed gemmules.
(b) Canal system.
(c ) Sponges maintain their shapes by having internal skeleton consisting of tiny calcareous or siliceous spicules, or fine spongin fibres or of both, located in the mesenchyme.