Which one of the following exhibits concentric tube within tube plan?

Arthropoda

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Oligochaeta

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Mollusca

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Echinodermata

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Solution

The correct option is B Oligochaeta
Annelids like oligochaetes exhibit tube within a tube body plan with multicellularity and bilateral symmetry. It refers to the development of a fluid-filled cavity between the outer body wall and the digestive tube. This plan calls for two openings, one for food to enter the body (mouth), one for wastes to leave the body.
So, the correct answer is option B.

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