Characteristic of ciliata are

Options

A. Cilia
B. Sexual reproduction
C. Free living
D. Two nuclei.

Answer

To answer the question about the characteristics of Ciliata, we can follow these steps:

### Step-by-Step Solution:

1. **Definition of Ciliata**:
- Ciliata are a group of unicellular eukaryotic organisms that are characterized by the presence of cilia, which are hair-like structures that help in movement and feeding. An example of a Ciliata is Paramecium.

2. **Cilia**:
- While cilia are a prominent feature of Ciliata, they are primarily used for locomotion and are not considered a defining characteristic of the group itself.

3. **Reproduction**:
- Ciliata can reproduce sexually and asexually. However, sexual reproduction involves the participation of sex organs, which is not a characteristic that applies universally to all Ciliata.

4. **Living Conditions**:
- Many Ciliata are free-living, but not all of them are. Therefore, stating that they are all free-living is incorrect.

5. **Nuclei**:
- A key characteristic of Ciliata is that they possess two types of nuclei: a macronucleus and one or more micronuclei. This is a defining feature of the group.

6. **Conclusion**:
- The characteristic that is true for Ciliata is the presence of two nuclei.

### Final Answer:
The characteristic of Ciliata is the presence of two nuclei.

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