First slide

Classification of Animals

Question

Cnidarians and ctenophores share which of the following characteristics?

Easy

A

Alternation of polyp and medusa stages
B

Tissue level of organisation
C

Colloblasts for anchorage
D

Comb plates for locomotion

Solution

Both Cnidaria and Ctenophora exhibit tissue level of organisation.
Alternation of polyp and medusa stages (metagenesis) is a phenomenon observed in Cnidaria (but not Ctenophora).
Ctenophores have colloblasts for anchorage and comb plates for locomotion. These structures are absent in cnidarians.

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