Which one of the following statement is wrong ?

Options

A. Pollen grains in some plants remain viable for months
B. Intine is made up of cellulose and pectin
C. When pollen is sheed at two -celled state, double fertilization does not take place
D. Vegetative cell is larger than generative cell

Answer

To determine which statement is wrong, we will analyze each statement provided in the question regarding pollen grains and fertilization in flowering plants.

### Step-by-Step Solution:

1. **Analyze the First Statement**:
- **Statement**: "Pollen grains in some plants remain viable for months."
- **Explanation**: Pollen grains can indeed remain viable for extended periods, sometimes from six months to a year. This is true for certain families of plants, such as Araceae and Rosaceae.
- **Conclusion**: This statement is true.

2. **Analyze the Second Statement**:
- **Statement**: "Intine is made up of cellulose and pectin."
- **Explanation**: The pollen grain has two layers: the inner layer (intine) and the outer layer (exine). The intine is indeed made up of cellulose and pectin, while the exine is made up of sporopollenin.
- **Conclusion**: This statement is also true.

3. **Analyze the Third Statement**:
- **Statement**: "When pollen is said at two cell state, double fertilization does not take place."
- **Explanation**: In the two-celled state, the mature pollen grain contains one generative cell and one vegetative cell. The generative cell divides to form two male gametes. One male gamete fuses with the female gamete to form the zygote, and the other fuses with the polar nuclei to form the primary endosperm nucleus. This process is known as double fertilization.
- **Conclusion**: This statement is incorrect because double fertilization does occur in the two-celled state.

4. **Analyze the Fourth Statement**:
- **Statement**: "Vegetative cell is larger than generative cell."
- **Explanation**: The vegetative cell is indeed larger than the generative cell. The vegetative cell develops into the pollen tube, while the generative cell divides to form the two sperm cells.
- **Conclusion**: This statement is true.

### Final Conclusion:
The wrong statement among the options provided is the third one: "When pollen is said at two cell state, double fertilization does not take place."

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