Question

Give the differences between two types of symmetry that animals show.

• A. (i) Bilateral symmetry : Organism having same design on left and right halves of the body are called as bilateral symmetrical.
  (ii) Radial symmetry: Organisms with a body design such that it can be divided into two equal halves from any radius are known as radially symmetrical.
• B. (i) Bilateral symmetry : Organisms with a body design such that it can be divided into two equal halves from any radius are known as bilateral symmetrical.
  (ii) Radial symmetry: Organism having same design on left and right halves of the body are called as radially symmetrical
• C. (i) Bilateral symmetry : Organism having different design on left and right halves of the body are called as bilateral symmetrical.
  (ii) Radial symmetry: Organisms with a body design such that it can not be divided into two equal halves from any radius are known as radially symmetrical.
• D. None of these.

Answer 1

The correct option is A (i) Bilateral symmetry : Organism having same design on left and right halves of the body are called as bilateral symmetrical.

(ii) Radial symmetry: Organisms with a body design such that it can be divided into two equal halves from any radius are known as radially symmetrical.
The difference between bilateral symmetry and radial symmetry are as follows:
(i) Bilateral symmetry: Organism having same design on left and right halves of the body are bilaterally symmetrical. Examples: earthworm, spider, cockroach
(ii) Radial symmetry: Organisms with a body design such that it can be divided into two equal halves from any diameter are known as radially symmetrical. Examples: starfish, sea-urchins.

So, the correct answer is 'option A'