Question

Give definition for bilateral symmetry, radial symmetry and pentaradial symmetry.

Answer 1

bilateral symmetry can be divided only into mirror halves through a single plane.
Radial symmetry a basic body plan in which the organism can be divided into similar halves by passing a plane at any angle along a central axis, characteristic of sessile and bottom-dwelling animals, as the sea anemone and starfish.
Pentaradial
follows a pattern where the parts of the animal branch out into five distinct compartments, or arms. 

Answer 2

Bilateral Symmetry

If a plane figure can be folded along a straight line so that you get 2 parts that coincide, then that plane figure is called a

Bilateral Symmetric

Plane figure.

Radial Symmetry

Radial symmetry is a symmetry in which the sides exhibit correspondence or regularity of parts around a central axis.

Pentaradial Symmetry

Pentaradial symmetry follows a pattern where the parts of the animal branch out into five distinct compartments, or arms.