Unicellularity is characteristic of

Options

A. Cyanobacteria
B. Monera
C. Protista
D. All the above.

Answer

To solve the question "Unicellularity is characteristic of," we will analyze the options provided: cyanobacteria, Mondra, Protista, and all of the above.

### Step-by-Step Solution:

1. **Understanding Unicellularity**:
- Unicellularity refers to organisms that consist of a single cell. These organisms are known as unicellular organisms.

2. **Analyzing the Options**:
- **Cyanobacteria**:
- Cyanobacteria are a group of photosynthetic bacteria. They are prokaryotic organisms, meaning they lack a true nucleus and membrane-bound organelles. They can exist as unicellular organisms or in colonial forms, but they are fundamentally unicellular.

- **Mondra**:
- The term "Mondra" appears to refer to a classification that includes various types of prokaryotes, such as Eubacteria and Archaebacteria. All these organisms are also unicellular. Therefore, this option is correct as well.

- **Protista**:
- The kingdom Protista consists of unicellular eukaryotic organisms. Eukaryotes have a true nucleus and membrane-bound organelles. All members of this kingdom are unicellular, making this option correct too.

3. **Conclusion**:
- Since all three options (Cyanobacteria, Mondra, and Protista) consist of unicellular organisms, the correct answer to the question is **D) all of the above**.

### Final Answer:
Unicellularity is characteristic of **all of the above** (Cyanobacteria, Mondra, Protista).

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