Question

There are three set of animals C, D and E. Which of the following types of organisms show cephalisation?

• A. Type C- Bilateral symmetry
• B. Type D- Radial symmetry
• C. Type E- No symmetry
• D. Both B and C

Answer 1

The correct option is A Type C- Bilateral symmetry

Cephalization is the process of development of a distninct head, the brain and nervous system during the development of an embryo. Of the given three options, it is possible only in the first choice which is bilateral symmetry. Bilateral symmetry is characterised by the division of the body into two exact mirror halves. Such organisms have distinct heads and thus show cephalization. In the case of radial symmetry, animals just have a mouth and pore. The last type of organism is asymmetrical.

Therefore, the correct answer is option A.