"Keiselgurh" a heat resistant material is obtained from :-

Options

A. Red Algae
B. Brown Algae
C. Diatoms
D. Fungi

Answer

To solve the question "Keiselgurh, a heat-resistant material, is obtained from:", we will analyze the options provided and determine which one is correct.

### Step-by-Step Solution:

1. **Understanding Keiselgurh**:
- Keiselgurh, also known as diatomaceous earth, is a heat-resistant material. It is important to identify the source of this material.

2. **Analyzing the Options**:
- **Option A: Red Algae**:
- Red algae contain calcium carbonate in their cell walls and are known for forming red coral. They do not produce Keiselgurh.
- **Conclusion**: Incorrect option.

- **Option B: Brown Algae**:
- Brown algae have a cell wall composed of cellulose and a gelatinous outer coat. They are not associated with the production of Keiselgurh.
- **Conclusion**: Incorrect option.

- **Option C: Diatoms**:
- Diatoms have a unique cell wall made of silica. The silica makes their shells resistant to decomposition. When diatoms die, their silica shells accumulate on the ocean floor, forming diatomaceous earth, which is the source of Keiselgurh.
- **Conclusion**: Correct option.

- **Option D: Fungi**:
- Fungi have cell walls made of chitin and do not produce Keiselgurh.
- **Conclusion**: Incorrect option.

3. **Final Answer**:
- Based on the analysis, the correct answer is **C: Diatoms**. Keiselgurh is obtained from diatoms due to their silica-rich cell walls.