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Sponges are ______(a) Asymmetrical(b) Radially Symmetrical(c) Bilaterally symmetrical(d) Bimedially symmetricalThe question was asked in a national level competition.My question is taken from Basis of Classification in Animals in division Animal Kingdom of Biology – Class 11

Answer»

Right choice is (b) Radially SYMMETRICAL

The best explanation: Sponges are asymmetrical. They contain UNEVEN branches growing on their surface that MAKES them asymmetrical. Symmetry is also considered as the basis of classification. An animal is considered to be radially symmetrical if their body looks similar when cut in any radial direction. Examples: Colentrates and echinodermata. An animal is considered to be bilaterally symmetrical if their body looks when cut along the LATERAL direction. Examples: Annelids, Arthropods and humans.


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