ANIMAL KINGDOM Part-2, NCERT Class-11

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Symmetry

•Asymmetrical:

Any plane that passes through the center doesn't divide the following organism into two equal half
e.g. sponges

•Radial Symmetry:

Any plane that passes through the central axis of the body divides the following organism into two equal halves
e.g. Coelenterates, Ctenophores, Adult Echinoderms
     Radial Symmetry(Hydra sp.)



•Bilateral Symmetry:

The body of the following organism can be divided into two equal halves if and only if the cutting plane pass through in a particular way through central axis
e.g. Annelids, Arthropods etc.

Bilateral Symmetry(Brachyura sp.)

Click Here for part 1 of this chapter

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