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Question

Pick the odd pair out:

A
Ctenophora : metameres
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B
Mollusca : bivalves
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C
Cnidaria : nematocysts
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D
Porifera : choanocytes
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Solution

The correct option is A Ctenophora : metameres
Members of Ctenophora do not exhibit metameric segmentation and hence metameres are absent. Metameres are linearly arranged repetitive units with atleast some organs repeated.

Mollusca includes a class Bivalvia in which the shell has two valves. Pearl oysters belong to this class.

Cnidarians are characterised by the presence of stinging cells/cnidocytes/nematocysts. These cells help in self defence, capture of prey and anchorage.

Poriferans have choanocytes, also called collar cells. These are flagellated cells that help in intracellular digestion in sponges.


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