Which of the following is endoparasitic protozoan?

Options

A. Paramoecium
B. Euglena
C. Amoeba
D. Plasmodium

Answer

To determine which of the following is an endoparasitic protozoan, we will analyze the characteristics of each option provided.

### Step-by-Step Solution:

1. **Understanding Endoparasitic Protozoans**:
- Endoparasitic protozoans are organisms that live inside the host's body and derive nutrients from it. They often inhabit areas like the intestines or bloodstream.

2. **Analyzing Each Option**:
- **Paramecium**:
- Paramecium is a unicellular organism that is known for being a heterotroph. However, it is not an endoparasite as it typically lives in freshwater environments and does not invade host bodies.
- **Euglena**:
- Euglena is a free-living organism that can be autotrophic (producing its own food) or heterotrophic (consuming nutrients). It is not an endoparasite as it does not live inside a host.
- **Amoeba**:
- Amoeba is also a unicellular organism that engulfs food through pseudopodia. While it is a heterotroph, it is not specifically an endoparasite since it does not primarily live inside a host.
- **Plasmodium**:
- Plasmodium is a genus of protozoan parasites known to invade the host's bloodstream. It is responsible for diseases such as malaria. Plasmodium is indeed an endoparasitic protozoan as it derives nutrients from the host and causes disease.

3. **Conclusion**:
- Based on the analysis, the only organism that qualifies as an endoparasitic protozoan is **Plasmodium**.

### Final Answer:
The endoparasitic protozoan among the options is **Plasmodium**.