Sporopollenin in exine of pollen grain can be degraded

Options

A. high temperature
B. low pH (strong acids)
C. some enzymes
D. can't be degraded

Answer

### Step-by-Step Solution:

1. **Understanding Sporopollenin**:
- Sporopollenin is a complex biopolymer found in the exine (outer layer) of pollen grains. It is known for its exceptional resistance to degradation.

2. **Characteristics of Sporopollenin**:
- It is one of the most durable biological materials known. It can withstand various environmental conditions, including high temperatures, strong acids, and alkalis.

3. **Resistance to Degradation**:
- Sporopollenin is resistant to chemical and microbial decomposition. This means that it does not easily break down in the presence of acids, bases, or even enzymes that typically degrade other biological materials.

4. **Implications for Fossilization**:
- Due to its durability, pollen grains can be well-preserved in the fossil record, allowing scientists to study ancient plant life.

5. **Composition of Sporopollenin**:
- Although the exact composition is not fully understood, studies suggest that sporopollenin is made up of long-chain fatty acids and other biopolymers such as phenolics and carotenoids.

6. **Conclusion**:
- Given its properties, the correct answer to the question "Sporopollenin in exine of pollen grain can be degraded" is that it **cannot be degraded**.

### Final Answer:
Sporopollenin in the exine of pollen grain **cannot be degraded**.

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