Q.
Which of the following animals have different symmetry in comparison to the other three?
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NTA AbhyasNTA Abhyas 2020Animal Kingdom
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Solution:
Types of animals on the basis of symmetry -
A. Asymmetrical - No particular symmetry. Examples - Most of the sponges
B. Radially symmetrical - When any plane passing through the central axis of the body divides the organism into 2 equal halves. Examples - Few sponges, coelenterates, ctenophores and adult echinoderms.
C. Bilaterally symmetrical - If the body of an organism is divisible into 2 equal halves only in one plane. Examples - Platyhelminthes, aschelminthes, annelids, arthropods, molluscs, the larva of echinoderms and chordates.