Animal Kingdom Question 1

1. Bilaterally symmetrical and acoelomate animals are exemplified by

(a) Platyhelminthes

(b) Aschelminthes

(c) Annelida

(d) Ctenophora

Show Answer

Answer : a

Hints & Solutions

(a) Platyhelminthes are bilaterally symmetrical, triploblastic and acoelomate animals with organ level of organisation. The body plane of most animals, including humans, exhibit mirror symmetry, also called bilateral symmetry. A body that is bilaterally symmetrical is easier for the brain to recognize while in different orientations and positions, thus making visual perception easier.