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Q.
Most of the asymmetrical acoelomates belong to phylum?
NTA AbhyasNTA Abhyas 2022
Solution:
Types of animals on the basis of symmetry -
$1.$ Asymmetrical - No particular symmetry. Examples : Most of sponges.
$2.$ Radially symmetrical - When any plane passing through the central axis of the body divides the organism in 2 equal halves. Examples : Few sponges, coelenterates, ctenophores and adult echinodermates.
$3.$ Bilaterally symmetrical - Body of organism is divisible into 2 equal halves only in one plane. Examples : Platyhelminthes, aschelminthes, annelids, arthropods, molluscs, echinodermates and chordates.