Which of the following points is incorrect about sporopollenin?

Options

A. It is one of thermoresistant organic material known
B. It can withstand high teperature and striong acids and alkali
C. 2 enzymes that degrade sporopollenin are known so far
D. Pollen grains are well preserved as fossils because of presence of sporopollenin

Answer

**Step-by-Step Solution:**

1. **Understanding Sporopollenin**: Sporopollenin is a complex organic substance found in the outer layer (exine) of pollen grains. It is known for its durability and resistance to degradation.

2. **Evaluating the Statements**: We need to analyze the statements provided in the question to identify which one is incorrect regarding sporopollenin.

3. **Analyzing Each Option**:
- **Option 1**: "It is one of the thermoresistant organic materials known."
- This statement is **true**. Sporopollenin is indeed thermoresistant, meaning it can withstand high temperatures.

- **Option 2**: "It can withstand high temperature and strong acids and alkali."
- This statement is also **true**. Sporopollenin is resistant to both high temperatures and harsh chemical conditions, including strong acids and alkalis.

- **Option 3**: "Two enzymes that degrade sporopollenin are known so far."
- This statement is **incorrect**. Currently, no enzymes have been identified that can degrade sporopollenin, making this the false statement.

- **Option 4**: "Pollen grains are well-preserved as fossils because of the presence of sporopollenin."
- This statement is **true**. The robustness of sporopollenin contributes to the preservation of pollen grains in the fossil record.

4. **Identifying the Incorrect Statement**: After evaluating all the options, the incorrect statement is **Option 3**, which claims that two enzymes that degrade sporopollenin are known.

5. **Conclusion**: The answer to the question is that the incorrect statement about sporopollenin is **Option 3**.

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