Determine the statement that is not related to sporopollenin .

Options

A. The hard outer layer of pollen grain is called exine which is made up of sporopollenin.
B. It is one of the most resistant organic material which is produced by endothecium
C. No enzyme is known yet which degrades sporopollenin.
D. It can withstand high temperature and strong and alkali.

Answer

To determine the statement that is not related to sporopollenin, we can analyze the statements provided about sporopollenin and its characteristics.

### Step-by-Step Solution:

1. **Understanding Sporopollenin**: Sporopollenin is a tough, protective substance found in the outer layer of pollen grains. It is known for its resistance to degradation by enzymes, acids, and bases.

2. **Identifying the Role of Sporopollenin**: Sporopollenin serves as a protective layer for pollen grains, which are crucial for the male gametophyte in flowering plants (angiosperms). Its primary function is to safeguard the pollen grains during their development and transport.

3. **Analyzing the Statements**:
- **Statement A**: "It is a hard outer layer of pollen grain which makes up the enzyme."
- This statement is incorrect because sporopollenin is not an enzyme; it is a substance that forms the outer layer of the pollen grain.

- **Statement B**: "It is the most resistant organic material, which is produced by endothelium."
- This statement is partially correct in that sporopollenin is resistant, but it is incorrect in stating that it is produced by the endothelium. The endothelium does not secrete sporopollenin; this function is performed by the tapetum.

- **Statement C**: "We don't know any enzyme that can degrade or break sporopollenin."
- This statement is correct as there are no known enzymes that can break down sporopollenin.

- **Statement D**: "It can withstand high temperature and strong alkali and acid."
- This statement is also correct, as sporopollenin is known for its stability under extreme conditions.

4. **Conclusion**: The statement that is not related to sporopollenin is **Statement A**, as it incorrectly describes sporopollenin as an enzyme.

### Final Answer:
The statement that is not related to sporopollenin is **Statement A**: "It is a hard outer layer of pollen grain which makes up the enzyme."