One of these is a cell organelle common in both Monera and Protista

Options

A. Ribosome
B. Lysosome
C. Mitochondria
D. chloroplast

Answer

To solve the question of which cell organelle is common in both Monera and Protista, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Groups**:
- Monera consists of unicellular prokaryotic organisms (like bacteria).
- Protista consists of unicellular eukaryotic organisms (like amoeba and paramecium).

2. **Identify the Options**:
- The question provides four options: Ribosome, Lysosome, Mitochondria, and Chloroplast.

3. **Evaluate Each Option**:
- **Ribosome**:
- Ribosomes are present in both prokaryotic and eukaryotic cells. They are essential for protein synthesis.
- Conclusion: This is a common organelle in both Monera and Protista.
- **Lysosome**:
- Lysosomes are membrane-bound organelles found only in eukaryotic cells.
- Conclusion: This is not common in Monera.
- **Mitochondria**:
- Mitochondria are also found only in eukaryotic cells and are involved in cellular respiration.
- Conclusion: This is not common in Monera.
- **Chloroplast**:
- Chloroplasts are found in plant cells and some protists but are not present in Monera.
- Conclusion: This is not common in Monera.

4. **Final Decision**:
- Based on the evaluations, the only organelle that is common in both Monera and Protista is **Ribosome**.

### Answer:
The cell organelle common in both Monera and Protista is **Ribosome**.

---