Which of the following is universally found in all protozoans ?

Options

A. Pseudopodia
B. Presence of pellicle
C. Eukaryotic organisation
D. Contractile vacuole

Answer

To determine which feature is universally found in all protozoans, we can follow these steps:

### Step 1: Understand what protozoans are
Protozoans are single-celled organisms that belong to the kingdom Protista. They are characterized as eukaryotic, meaning their cells contain a nucleus and other organelles.

**Hint:** Remember that all protozoans are unicellular and belong to the kingdom Protista.

### Step 2: Analyze the options provided
We need to evaluate each option to see if it is universally present in all protozoans.

1. **Pseudopodia**: This structure is used for movement and feeding in some protozoans, such as amoeba, but it is not found in all protozoans. Therefore, this option is not universally applicable.

**Hint:** Consider whether the feature is present in all types of protozoans or just some.

2. **Pellicle**: A pellicle is a flexible outer covering found in some protozoans, but not all. Thus, this option is also not universally applicable.

**Hint:** Think about whether this feature is a common characteristic across all protozoans.

3. **Eukaryotic organization**: All protozoans are eukaryotic, meaning they all have a complex cell structure with a nucleus. This feature is universally found in all protozoans.

**Hint:** Recall the definition of eukaryotic cells and their significance in distinguishing protozoans.

4. **Contractile vacuole**: This structure helps in osmoregulation and is present in some protozoans, such as amoeba, but not in all. Therefore, this option is not universally applicable.

**Hint:** Assess whether this structure is essential for all protozoans or just specific types.

### Step 3: Conclusion
After evaluating all the options, we find that the only feature that is universally found in all protozoans is **eukaryotic organization**.

**Final Answer:** The correct answer is option 3: **Eukaryotic organization**.