Organs of locomotion are absent in

Options

A. Dinoflagellates
B. Sporozoans
C. sarcodines
D. Ciliates

Answer

**Step-by-Step Solution:**

1. **Understanding the Question**: The question asks which organisms lack organs of locomotion. Organs of locomotion are structures that allow an organism to move from one place to another.

2. **Identifying Organisms**: We need to evaluate the given options to determine which organism is an absolute parasite and lacks locomotory organs.

3. **Analyzing the Options**:
- **Dinoflagellates**: These are flagellated organisms found in aquatic environments. They possess flagella, which are locomotory organs, allowing them to swim.
- **Sporozoans**: These are a group of protozoans that are known to be parasites. They do not have locomotory organs because they live inside hosts and absorb nutrients directly from them.
- **Sarcodines**: These organisms, such as amoeba, use pseudopodia for movement and feeding. Therefore, they do have locomotory organs.
- **Ciliates**: These organisms have cilia, hair-like structures that help them move. Thus, they also possess locomotory organs.

4. **Conclusion**: Among the options, sporozoans are the only group that is entirely parasitic and lacks any organs of locomotion.

5. **Final Answer**: Organs of locomotion are absent in **Sporozoans**.

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