1.

(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» (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.


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