What is wrong

Options

A. Pollen grains remain viable for several months because of sporopollenin covering
B. No enzyme can degrade sporopollenin
C. Pollen grains are well represented in fossil strata due to sporopollenin
D. Pollen wall has cavities containing proteins.

Answer

### Step-by-Step Solution:

1. **Understanding Pollen Grains**:
- Pollen grains are the male gametophytes in seed plants. They are crucial for the process of fertilization.

2. **Structure of Pollen Grains**:
- Pollen grains have two main layers: the outer layer and the inner layer.
- The outer layer is composed of a substance called sporopollenin, which is known for its durability and resistance to degradation.

3. **Sporopollenin's Role**:
- Sporopollenin is a highly resistant organic material that protects pollen grains from environmental factors, allowing them to remain viable for several months.

4. **Evaluating Statements**:
- The first statement claims that pollen grains remain viable for several months due to sporopollenin covering. This is **correct**.
- The second statement asserts that no enzyme can degrade sporopollenin. This is also **correct**.
- The third statement states that pollen grains are well represented in fossil strata due to sporopollenin. This is **correct** as well.
- The fourth statement claims that the pollen wall has cavities containing proteins. This is **incorrect**. The outer layer has pores for the formation of the pollen tube but does not contain cavities with proteins.

5. **Conclusion**:
- The only wrong statement among the options provided is the fourth one, which states that the pollen wall has cavities containing proteins.

### Final Answer:
The wrong statement is: "Pollen wall has cavities containing proteins."

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