OBJECTIVE LIFE SCIENCE
EVOLUTION
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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This animal phyla does not have a body cavity, is asymmetrical and has no segmentation
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Porifera
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Cnidaria
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Platyhelmintha
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Mollusca
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Chordata
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Explanation:
Detailed explanation-1: -Platyhelminthes do not have a body cavity, that is they do not have a coelom and are acoelomates.
Detailed explanation-2: -True body cavity is not present in sponges. These are non-motile animals attached to some solid support which have holes or ‘pores’ all over the body. They belong to the phylum Porifera.
Detailed explanation-3: -Asymmetry. Only members of the phylum Porifera (sponges) have no body plan symmetry. There are some fish species, such as flounder, that lack symmetry as adults. However, the larval fish are bilaterally symmetrical.
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