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.
