In which of the following protozoans locomotory structure are absent

Options

A. Sarcodina
B. Sporozoans
C. Ciliata
D. Mastigophores

Answer

To solve the question "In which of the following protozoans locomotory structures are absent?", we will analyze each option provided.

### Step-by-Step Solution:

1. **Understanding the Question**: The question asks us to identify which protozoan lacks any locomotory structures. Locomotory structures are parts of the organism that aid in movement.

2. **Analyzing Option 1: Sarcodina**:
- Sarcodina, such as Amoeba, use pseudopodia for movement. Pseudopodia are temporary extensions of the cell that help in locomotion and capturing food.
- **Conclusion**: Sarcodina has locomotory structures (pseudopodia), so this option is incorrect.

3. **Analyzing Option 2: Sporozoa**:
- Sporozoa, such as Plasmodium (the causative agent of malaria), do not have any locomotory structures. They are typically non-motile in their adult form.
- **Conclusion**: Sporozoa is the correct answer as they lack locomotory structures.

4. **Analyzing Option 3: Ciliata**:
- Ciliata, such as Paramecium, possess cilia, which are hair-like structures that aid in movement.
- **Conclusion**: Ciliata has locomotory structures (cilia), so this option is incorrect.

5. **Analyzing Option 4: Mastigophora**:
- Mastigophora, such as Euglena, have flagella that help in movement.
- **Conclusion**: Mastigophora has locomotory structures (flagella), so this option is incorrect.

6. **Final Conclusion**: After analyzing all the options, the only protozoan that lacks locomotory structures is **Sporozoa**.

### Answer:
The correct answer is **Option 2: Sporozoa**.

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