Protists having noncontractile pusule are
ciliates
dinoflagellates
sporozoans
euglenoids

Options

A. ciliates
B. dinoflagellates
C. sporozoans
D. euglenoids

Answer

To solve the question regarding which protists have non-contractile pusule, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Protists**:
- Protists are a diverse group of eukaryotic microorganisms that belong to the kingdom Protista. They can be unicellular or multicellular and exhibit various forms of nutrition and locomotion.

2. **Identifying Types of Protists**:
- The question provides four options: ciliates, dinoflagellates, sporozoans, and euglenoids. Each of these groups has distinct characteristics.
- Ciliates are known for their cilia used for movement and feeding.
- Sporozoans are primarily parasitic and do not have specialized structures for movement.
- Euglenoids are photosynthetic protists that have a flagellum for movement.

3. **Focusing on Vacuoles**:
- A key feature mentioned in the question is the type of vacuole present in these protists.
- Contractile vacuoles are used for expelling excess water in many protists, while non-contractile vacuoles serve different functions.

4. **Identifying the Unique Feature**:
- Dinoflagellates are noted for having a non-contractile vacuole, which is referred to as a "pusule" or "pissle." This structure is located near the base of their flagella and is involved in flotation and osmoregulation.

5. **Conclusion**:
- Based on the characteristics of the different types of protists and the specific feature of the non-contractile pusule, we can conclude that the correct answer to the question is **dinoflagellates**.

### Final Answer:
**Dinoflagellates** (Option 2)

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