Explain briefly how animals can be classified based on body symmetry.

Explanation

Based on body symmetry, animals can be classified into three groups:
i.Asymmetrical body: In this type of symmetry, there is no such imaginary axis of the body through which we can get two equal halves. e.g. Amoeba, Paramoecium, some sponges.
ii. Radial symmetry: In this type of symmetry, if an imaginary cut passes through the central axis of any plane of the body, it gives two equal halves, e.g. Starfish.In starfish, there are five different planes passing through the central axis of the body, through which we can get two equal halves.
iii. Bilateral symmetry: In this type of symmetry,there is only one such imaginary axis of the body through which we can get two equal halves. e.g. Insects, fishes, frog, birds, human, etc.