In protozoa, locomotory structures are absent in the class

Options

A. Rhizopoda
B. Ciliata
C. Sporozoa
D. Flagellata

Answer

To solve the question regarding which class of protozoa lacks locomotory structures, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Question**: The question asks which class of protozoa does not have locomotory structures. Locomotory structures are the parts of an organism that help it move.

2. **Identify the Classes of Protozoa**: Protozoa are generally classified into four main groups based on their locomotion:
- Rhizopoda (Amoeboids)
- Ciliata (Ciliates)
- Flagellata (Flagellates)
- Sporozoa (Sporozoans)

3. **Analyze Each Class**:
- **Rhizopoda**: These protozoans, like amoebas, move using pseudopodia (false feet).
- **Ciliata**: These protozoans have cilia (tiny hair-like structures) that help them move.
- **Flagellata**: These protozoans use flagella (long whip-like structures) for movement.
- **Sporozoa**: This group is characterized by being non-motile. They do not have any specialized locomotory structures and are often parasitic.

4. **Determine the Correct Answer**: Since the question specifies the absence of locomotory structures, the class that fits this description is **Sporozoa**. They do not possess any organ for locomotion.

5. **Final Answer**: The class in protozoa where locomotory structures are absent is **C. Sporozoa**.