Sporopollenin is one of the most resisant organic materia known. It can withstand

Options

A. high temperatures and strong acids
B. strong acids and alkali
C. microbial enzyme
D. all of these

Answer

**Step-by-Step Solution:**

1. **Understanding Sporopollenin**: Sporopollenin is a complex organic polymer that forms the outer layer of pollen grains. It is known for its remarkable resistance to various environmental factors.

2. **Structure of Pollen Grain**: A pollen grain consists of two main layers: an outer layer (exine) and an inner layer (intine). The outer layer is primarily composed of sporopollenin, which provides structural integrity and protection.

3. **Resistance Properties**: Sporopollenin is recognized for its ability to withstand extreme conditions. It is resistant to:
- **High Temperatures**: It can endure elevated temperatures without degrading.
- **Strong Acids and Bases**: Sporopollenin remains intact when exposed to strong acidic or basic environments.
- **Microbial Enzymes**: No known enzymes have been identified that can break down sporopollenin, making it resistant to microbial degradation.

4. **Conclusion**: Given these properties, sporopollenin is one of the most resistant organic materials known, capable of withstanding high temperatures, strong acids and bases, and microbial enzymes.

5. **Options Analysis**:
- **Option A**: It can withstand high temperatures and strong acids - Correct.
- **Option B**: It can withstand strong acids and alkalis - Correct.
- **Option C**: It can withstand microbial enzymes - Correct.
- **Option D**: All of the above - Correct.

Thus, the correct answer is **Option D: All of the above**.

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