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Question
Which of the following dose not belong to the phylum Platyhelminthes?
Which of the following dose not belong to the phylum Platyhelminthes?
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Solution
The correct option is B Ascaris
Characteristic features of Phylum Platyhelminthes are:
- Their body is dorsoventrally flattened.
- They exhibit bilateral symmetry.
- Also, they are triploblastic (There are three layers of cells from which differentiated tissues can be made).
- They do not have a body cavity and are acoelomate.
- The body is soft and unsegmented.
- They are mostly parasitic with a few free-living.
- Hence, Planaria, tape worm and liverfluke belong to Platyhelminthes
Whereas, the Ascaris is a Nematoda (Aschelminthes) having a cylindrical body.
So, the correct answer is option B.
Characteristic features of Phylum Platyhelminthes are:
- Their body is dorsoventrally flattened.
- They exhibit bilateral symmetry.
- Also, they are triploblastic (There are three layers of cells from which differentiated tissues can be made).
- They do not have a body cavity and are acoelomate.
- The body is soft and unsegmented.
- They are mostly parasitic with a few free-living.
- Hence, Planaria, tape worm and liverfluke belong to Platyhelminthes
Whereas, the Ascaris is a Nematoda (Aschelminthes) having a cylindrical body.
So, the correct answer is option B.
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