Differentiate between radial and bilateral symmetry.

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Solution

Bilateral symmetry is defined as body symmetry where the body can be divided into two identical halves in only one plane.
Radial symmetry is a type of body symmetry, where any plane passing through the center divides the body into two equal halves. E.g. Echinoderms
The difference between radial and bilateral symmetry is shown below -
S.No. Radial Symmetry Bilateral Symmetry
1 Limbs and organs occur all around the central axis. Limbs and organs are paired.
2 Cephalization is absent. Cephalization is present.
3 The animal's body can be divided into two equal halves by any vertical plane passing through the central axis. The animal's body can be divided into two equal halves by only one plane.
4 Example - Hydra Example - Earthworm

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S.No.	Radial Symmetry	Bilateral Symmetry
1	Limbs and organs occur all around the central axis.	Limbs and organs are paired.
2	Cephalization is absent.	Cephalization is present.
3	The animal's body can be divided into two equal halves by any vertical plane passing through the central axis.	The animal's body can be divided into two equal halves by only one plane.
4	Example - Hydra	Example - Earthworm