Question

Which of the following is not a feature of flatworms?

• A. endoderm
• B. mesoderm
• C. ectoderm
• D. pseudocoelomate

Answer 1

The correct option is D

pseudocoelomate

The correct option is D.

The explanation for the correct option:

1. Phylum Platyhelminthes comes under the kingdom Animalia.
2. They are also known as flatworms.
3. They are invertebrates, that is, they are devoid of the dorsal notochord.
4. They are acoelomate, that is, they lack a coelom, and they do not possess a body cavity.
5. Examples are tapeworms, turbellaria, flukes, etc.

The explanation for the incorrect options:

Option A:

1. Platyhelminthes are triploblastic.
2. Endoderm is one of the three germ layers found in the Platyhelminthes.
3. The endoderm provides lift to the gut and many organs found internally, it forms the digestive tract.

Option B:

1. Mesoderm is one of the three germ layers found in the Platyhelminthes.
2. It provides growth to the connective tissue and muscle cells, blood and blood vessels, reproductive organs, and organs of excretion in the body.

Option C:

1. Ectoderm is one of the three germ layers found in the Platyhelminthes.
2. Ectoderm gives rise to shells, skin, and other protective coverings, and many nerves and sense organs in the body.

Final answer: Pseudocoelomate is not a feature of flatworms.