question_answer 45)

  Sort out the animals on the basis of their symmetry (radial or bilateral) coelenterates, ctenophores, annelids, arthropods and echinoderms.

Answer:

                  Body symmetry is the similarity of body parts in different region and directions of the body plan. In radial symmetry, body of an individual can be divided into equal halves by any plans passing through the longitudinal axis. (e.g., Coelentrates, Ctenophores, Echinoderms. In bilateral symmetry, body can be divided into two equal halves when the plane passes through the median longitudnal or saggital axis. (e.g., Annelids, Arthropods)