Question

Which of the following does not belong to phylum Platihelminthes?

• A. Roundworm
• B. Tapeworms
• C. Rhabditophora
• D. Flukes

Answer 1

The correct option is A

Roundworm

The correct option is A.

Explanation for Correct Option:

1. Roundworm or Ascaris lumbricoides belong to the phylum Nematoda.
2. They have a body that is cylindrical, bilaterally symmetrical, and triploblastic.
3. They contain a pseudocoelom.

Explanation for Incorrect Options:

Option B:

1. Tapeworms or flatworms belong to class Cestoda and phylum Platyhelminthes.
2. Their body is flattened from top to bottom, so they are also known as flatworms.

Option C:

Rhabditophora is a class of parasitic flatworms that belong to the phylum Platyhelminthes.

Option D:

Fluke or blood fluke or trematode belongs to class Trematoda and phylum Platyhelminthes.

Final answer: Roundworms do not belong to the phylum Platyhelminthes.