Q. 20 Triploblastic animals with only mouth which serves in both ingestion and also egestion are
1)
Ctenophora
2)
Aschel minthes
3)
Platyhelminthes
4)Cnidarians
Answers
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Answer: Platyhelminthes
Explanation:
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Answer:
3-Platyhelminthes
Explanation:
An undifferentiated layer, mesoglea, is present in between the ectoderm and the endoderm. These animals in which the developing embryo has a third germinal layer, mesoderm, in between the ectoderm and endoderm , are called triploblastic animals( from phylum platyhelminthes to phylum chordata).
So, 1-Ctenophora and 4-Cnidarians(which is also called coelenterons) belong to diploblastic animals.
Phylum Platyhelminthes has only single opening and these form have an incomplete alimentary canal.
Note- Refer class X1 Biology NCERT text book pg.no.47-48.
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