Monocystis differs from Paramoecium due to the absence of ?

Options

A. Contractile vacuole
B. Cilia
C. Dimorphic nucleus
D. All of the above

Answer

To solve the question "Monocystis differs from Paramecium due to the absence of?", we will analyze the characteristics of both organisms and identify the organelles that are absent in Monocystis.

### Step-by-Step Solution:

1. **Identify the Organisms**:
- Monocystis and Paramecium both belong to the group Protozoa. They share some similarities but also have distinct differences.

2. **Examine the Options**:
- The question provides several options regarding the organelles that may be absent in Monocystis compared to Paramecium.

3. **Option Analysis**:
- **Contractile Vacuole**:
- This organelle is responsible for maintaining osmotic balance by expelling excess water. Monocystis lacks a contractile vacuole, while Paramecium has one.
- **Conclusion**: Monocystis does not have a contractile vacuole.

- **Cilia**:
- Cilia are hair-like structures that aid in locomotion and feeding. Paramecium is covered with cilia, which it uses for movement and capturing food. Monocystis, on the other hand, does not possess cilia.
- **Conclusion**: Monocystis lacks cilia.

- **Dimorphic Nucleus**:
- Paramecium has two types of nuclei (a macronucleus and a micronucleus), which is a characteristic feature of this organism. Monocystis does not exhibit this dimorphism in its nuclear structure.
- **Conclusion**: Monocystis does not have a dimorphic nucleus.

4. **Final Conclusion**:
- Since Monocystis lacks the contractile vacuole, cilia, and dimorphic nucleus, it differs from Paramecium due to the absence of all these organelles. Therefore, the correct answer is that Monocystis differs from Paramecium due to the absence of **all of the above**.

### Final Answer:
Monocystis differs from Paramecium due to the absence of **contractile vacuole, cilia, and dimorphic nucleus**.

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