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 1: Identify the Classes of Protozoa
Protozoa are classified into several classes, including:
- Rhizopoda (Amoeboid protozoa)
- Ciliata (Ciliated protozoa)
- Sporozoa (Spore-forming protozoa)
- Flagellata (Flagellated protozoa)

### Step 2: Analyze Each Class for Locomotory Structures
1. **Rhizopoda**: This class includes amoeboid protozoa that use pseudopodia for movement. Example: *Entamoeba*.
2. **Ciliata**: Members of this class possess cilia, which are hair-like structures that aid in locomotion. Example: *Paramecium*.
3. **Sporozoa**: This class is characterized by the absence of locomotory structures. They are mostly parasitic and do not move independently. Example: *Plasmodium* (causes malaria).
4. **Flagellata**: This class has flagella, which are whip-like structures used for movement. Example: *Trypanosoma*.

### Step 3: Conclusion
Based on the analysis, the class of protozoa that lacks locomotory structures is **Sporozoa**.

### Final Answer
In protozoa, locomotory structures are absent in the class **Sporozoa**.

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