Which of these is a special feature of porifera?

All are marine

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Tissue level organization

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Canal system

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Bodies are symmetrical

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Solution

The correct option is D Canal system
A. Sponges may be marine (for example, Sycon) or freshwater (for example, Spongilla).
B. Tissues are not well differentiated in sponges. They show the cellular level of organization.
C. Canal system is a characteristic feature of phylum Porifera i.e. sponges. The canal system helps in respiration, circulation, excretion and nutrition.
D. Their bodies are asymmetrical.
Hence the correct option is C.

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