Question

How do the body plans of animals with bilateral and radial symmetry differ?

Answer 1

Bilateral symmetry cut into equal halves through one radius, while radial symmetry animals cut into two equal halves through radii.

Explanation:

1. The bilateral symmetry animals body are divided into two equal halves from a particular radius passing through the centre. The direction of cutting is fixed. We can cite the example of human beings, fish, etc.
2. The radial symmetry animals body are cut into two equal halves from all the radii of the animals body passing through the centre. We can cite the examples of the members Coelentrates. Thank You.

Answer 2

Bilaterally symmetrical organisms could be divided into two mirror halves by cutting only along a single plane. It is possible to divide radially symmetrical organisms into two mirror halves by cutting through several planes.

Explanation:

All radially symmetrical animals are aquatic and their body has an oral and another aboral side. Compared to this a bilaterally symmetrical organism has anterior/posterior, left/right and dorsal/ventral sides.

Bilaterally symmetrical organisms develop head-like structure or proper head, i.e. there is cephalisation. From platyhelminthes onwards all animal phyla are primarily bilaterally symmetrical.

Secondary pentaradial symmetry appear in echinodermata as all larval forms are bilaterally symmetrical.