Write down four characteristics of Ctenophora and give two examples.

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Solution

Characteristics of Ctenophora:

(i) They have a transparent body with biradial symmetry and are triploblastic.
(ii) They bear two tentacles and eight longitudinal rows of ciliary comb-plates for locomotion.
(iii) They are marine, solitary or free-swimming.
(iv) They lack nematocysts but adhesive cells (colloblasts) are present.
Examples: Pleurobrachia (comb jelly) and Ctenoplana

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