Animal Kingdom Question 7
7. Radial symmetry is usually associated with
(a) aquatic mode of life
(b) lower grade of organisation
(c) creeping mode of locomotion
(d) sedentary mode of life
Show Answer
Answer : d
Hints & Solutions
(d) Radial Symmetry is usually associated with sedentary mode of life (e.g. cnidarians). It permits an animal to detect food or danger approaching from any side. In radial symmetry body is in the form of flat or tall cylinder and can be divided into similar halves by more than two planes passing through one main axis. It is found in some sponges, hydras, jellyfish, sea urchin, etc.
