Which of the folliwng statement is wrongs?

Options

A. pollen grains remain viable for several months because their outer covering is made of sprorpollenin
B. no enzyme can degrade spororpollenin
C. pollen grains are well repersented in fossil strata due to sprorpollenin
D. pollenwall was cavities containing proteins

Answer

To solve the question "Which of the following statements is wrong?" regarding the structure of pollen grains, we will analyze each statement provided and determine which one is incorrect.

### Step-by-Step Solution:

1. **Understanding Pollen Grain Structure**:
- Pollen grains consist of a pollen wall that has two layers: the inner layer called the *intine* and the outer layer called the *exine*.
- The intine is relatively thin and is composed of pectin and cellulose, which are polysaccharides.
- The exine is much thicker than the intine and is made of a substance called *sporopollenin*, which is highly resistant to degradation.

2. **Analyzing Each Statement**:
- **Statement 1**: "Pollen grains remain viable for several months in a pea."
- This statement is true. Pollen grains can remain viable for extended periods due to the protective nature of sporopollenin.

- **Statement 2**: "No enzyme can degrade sporopollenin."
- This statement is also true. Sporopollenin is known to be highly resistant to degradation by enzymes, acids, and alkalis.

- **Statement 3**: "Pollen grains are well represented as fossils in strata."
- This statement is true as well. The durability of sporopollenin allows pollen grains to be preserved as fossils in geological strata.

- **Statement 4**: "Pollen wall has cavities containing proteins."
- This statement is incorrect. The pollen wall does not have cavities containing proteins; instead, it is a solid structure without such cavities.

3. **Conclusion**:
- The statement that is wrong is **Statement 4**: "Pollen wall has cavities containing proteins."

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

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