Symmetry – Class 11 | Chapter – 4 | Short Notes Series PDF

Symmetry: Animals can be categorised on the basis of their symmetry. Sponges are mostly asymmetrical, i.e., any plane that passes through the centre does not divide them into equal halves.

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Types of Symmetry

Radial symmetry: A symmetry where any plane passing through the central axis divides the body into two equal halves is called the radial symmetry. Examples are Coelenterates, ctenophores and echinoderms.

Bilateral symmetry: In bilateral symmetry, only a single plane divides the body into two equal halves, e.g. Annelids, Arthropods, Molluscs, etc.


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