Pseudopodia occur in

Options

A. Sarcodina
B. Sporozoa
C. Ciliata
D. Mastigophora.

Answer

**Step-by-Step Solution:**

1. **Understanding the Question**: The question asks where pseudopodia occur. Pseudopodia are temporary projections of eukaryotic cells, often used for movement and feeding.

2. **Identifying the Options**: The options given are:
- Sarcodena
- Sporozoa
- Ciliata
- Mastigophora

3. **Classifying Protozoans**: Protozoans are classified based on their locomotory structures. Each of the options represents a different group of protozoans:
- **Sarcodena**: Characterized by the presence of pseudopodia.
- **Sporozoa**: Lacks locomotory structures.
- **Ciliata**: Moves using cilia.
- **Mastigophora**: Moves using flagella.

4. **Analyzing Each Group**:
- **Sarcodena**: These organisms, such as amoebas, utilize pseudopodia for movement. The term "pseudopodia" literally means "false feet."
- **Sporozoa**: These do not have any locomotory structures. An example is Plasmodium, which is a parasite.
- **Ciliata**: These organisms use cilia for movement. An example is Paramecium.
- **Mastigophora**: These organisms use flagella for movement. An example is Euglena.

5. **Conclusion**: Based on the classification and the characteristics of each group, pseudopodia are specifically found in **Sarcodena**.

**Final Answer**: Pseudopodia occur in **Sarcodena**.

---