Which one is not a protozoan protist

Options

A. Plasmodium vivax
B. Paramecium coudatum
C. Enterobius vermiclaris
D. Trypanosoma gambiense.

Answer

To determine which of the given options is not a protozoan protist, we will analyze each option step by step.

### Step-by-Step Solution:

1. **Identify the Options**: The options provided are:
- A) Plasmodium vivax
- B) Paramecium caudatum
- C) Enterobius vermicularis
- D) Trypanosoma gambiense

2. **Analyze Plasmodium vivax**:
- Plasmodium vivax is a unicellular organism that belongs to the kingdom Protista. It is a protozoan parasite responsible for malaria and requires two hosts: humans and female Anopheles mosquitoes.
- **Conclusion**: This is a protozoan protist.

3. **Analyze Paramecium caudatum**:
- Paramecium caudatum is a well-known example of a ciliated protozoan. It is unicellular and uses cilia for locomotion.
- **Conclusion**: This is also a protozoan protist.

4. **Analyze Enterobius vermicularis**:
- Enterobius vermicularis is commonly known as the pinworm. It is classified as a nematode (roundworm) and belongs to the phylum Helminthes. It is an intestinal parasite and does not belong to the kingdom Protista.
- **Conclusion**: This is NOT a protozoan protist; it is a nematode.

5. **Analyze Trypanosoma gambiense**:
- Trypanosoma gambiense is a pathogenic protozoan that causes sleeping sickness. It is a unicellular organism and is classified under the kingdom Protista.
- **Conclusion**: This is a protozoan protist.

6. **Final Conclusion**:
- Among the options, Enterobius vermicularis is the only organism that is not a protozoan protist. Therefore, the correct answer is **C) Enterobius vermicularis**.