A cell organelle common in Protista and Monera is

Options

A. Vacuole
B. Chloroplast
C. Lysosome
D. Ribosome

Answer

**Step-by-Step Solution:**

1. **Understand the Groups:** Identify the two groups mentioned in the question: Protista and Monera. Protista consists of unicellular eukaryotes, while Monera consists of unicellular prokaryotes.

2. **Identify Characteristics of Monera:** Recognize that Monera (prokaryotes) lack membrane-bound organelles. This means that organelles like the nucleus, mitochondria, and endoplasmic reticulum are absent in Monera.

3. **Identify Characteristics of Protista:** Understand that Protista (eukaryotes) possess membrane-bound organelles but can also have non-membrane-bound organelles.

4. **Determine the Type of Organelle Needed:** Since the question asks for a common organelle in both groups, it must be a non-membrane-bound organelle, as Monera does not have membrane-bound organelles.

5. **Evaluate the Options:**
- **Vacuole:** A membrane-bound organelle, so it cannot be the answer.
- **Chloroplast:** A double membrane-bound organelle, so it is also not the answer.
- **Lysosome:** A single membrane-bound organelle, thus not present in Monera.
- **Ribosomes:** Non-membrane-bound organelles that are present in both prokaryotes (Monera) and eukaryotes (Protista).

6. **Conclusion:** The correct answer is ribosomes, as they are the only organelle common to both Protista and Monera.

**Final Answer:** Ribosomes

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