Question

Define radial symmetry and exoskeleton.

Answer 1

Answer:

Radial symmetry is the arrangement of body parts around a central axis, like rays on a sun or pieces in a pie. Radially symmetrical animals have top and bottom surfaces, but no left and right sides, or front and back.

a rigid external covering for the body in some invertebrate animals, especially arthropods.

Explanation:

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Answer 2

Answer:

Radial Symmetry:-

• In this kind of symmetry, the individual's body can be divided into equal halves by any plane passing through the centre.

• This symmetry is generally seen in sponges, cnidarians (Jelly fish, Hydra) and echniderms (star fish).

Exoskeleton:-

• Exoskeleton is a hard external structure of animal body.

• It is present outside the body.

• It is formed from ectoderm or mesoderm.

• Example: calcareous shell of molluscs, chitinous covering of insects, scales, feathers, horns, claws and hairs of vertebrates.