Question

The property by which an imaginary line or lines can divide an animal into two or more equal halves is called .

• A. segmentation
• B. symmetry
• C. organisation
• D. metamerism

Answer 1

The correct option is B symmetry

The property by which an imaginary plane or planes can divide an animal into two or more equal halves is called symmetry.

• When any plane passing through the central axis of the body divides the organism into two identical halves, it is called radial symmetry. Cnidarians (Jelly fish), ctenophores (Comb jellies) and echinoderms (Star fish) have this kind of body plan.
• Animals in which the body can be divided into identical left and right halves along just one plane, exhibit bilateral symmetry, such as the annelids (earthworms), arthropods (insects) and most chordates.