Silicon is present in cell walls of

Options

A. Monera
B. Protista
C. Fungi
D. Plantae

Answer

**Step-by-Step Solution:**

1. **Understand the Question:** The question asks about the presence of silicon in the cell walls of certain organisms.

2. **Identify the Organisms:** The options to consider include:
- Monera (bacteria)
- Protista (protists)
- Fungi
- Plantae (plants)

3. **Analyze the Cell Wall Composition:**
- **Monera:** The cell wall is primarily composed of peptidoglycans.
- **Protista:** The cell wall can consist of cellulose or silica. Some protists, especially diatoms, have silica in their cell walls.
- **Fungi:** The cell wall is made up of chitin.
- **Plantae:** The cell wall is mainly composed of cellulose, pectin, and hemicellulose.

4. **Determine the Correct Answer:** Based on the analysis, silicon is present in the cell walls of protists, particularly in the form of silica.

5. **Conclude:** Therefore, the correct answer to the question is that silicon is present in the cell walls of protists.

**Final Answer:** Silicon is present in the cell walls of protists.

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