Multiple choice

Coelentrates differ from other animals in having :

  1. nematocysts

  2. polymorphism

  3. blateral symmetry

  4. skeleton
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A Correct answer
Explanation

Nematocysts are the characteristic feature of phylum Coelenterate. These are sac like organelles located at the centre of cnidocyte. Cnidocytes or stringing cells occur in entire epidermis except that of basal disc. The free end of each cnidocyte at epidermal surface bears a small and stiff conical spine-like projection called cnidocil or trigger. 

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