Select correct statement w.r.t. Monera
(a) All are autotrophic prokaryotes
(b) All are chemoheterotrophs
(c) Unicellular, colonial or filamentous organisms
(d) Prokaryotes with 70 S ribosome and histonic DNA

Options

A. All are autotrophic prokaryotes
B. All are chemoheterotrophs
C. Unicellular, colonial or filamentous organisms
D. Prokaryotes with 70 S ribosome and histonic DNA

Answer

To solve the question regarding the correct statement with respect to Monera, we will analyze each option one by one.

### Step-by-Step Solution:

1. **Understanding Monera**:
- Monera is a kingdom that includes prokaryotic organisms, which means they do not have a defined nucleus. They are primarily unicellular and include bacteria and cyanobacteria (blue-green algae).

2. **Analyzing Option (a)**:
- **Statement**: "All are autotrophic prokaryotes."
- **Evaluation**: This statement is incorrect because not all organisms in Monera are autotrophic. Some are heterotrophic, meaning they obtain their food from other sources.

3. **Analyzing Option (b)**:
- **Statement**: "All are chemoheterotrophs."
- **Evaluation**: This statement is also incorrect. Monera includes both autotrophic and heterotrophic organisms. Therefore, it cannot be said that all are chemoheterotrophs.

4. **Analyzing Option (c)**:
- **Statement**: "Unicellular, colonial or filamentous organisms."
- **Evaluation**: This statement is correct. Monera includes unicellular organisms, and some can form colonies or filamentous structures, especially cyanobacteria.

5. **Analyzing Option (d)**:
- **Statement**: "Prokaryotes with 70 S ribosome and histonic DNA."
- **Evaluation**: This statement is partially correct. While Monera does have 70 S ribosomes, the DNA in these organisms does not have histones. Instead, their DNA is circular and double-stranded. Therefore, this statement is incorrect.

6. **Conclusion**:
- The only correct statement regarding Monera is option (c): "Unicellular, colonial or filamentous organisms."

### Final Answer:
The correct statement with respect to Monera is **(c) Unicellular, colonial or filamentous organisms.**

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