Study the following statements and select the incorrect option.

Options

A. Tapetum nourishes the developing pollen grains
B. Hilum represents the junction between ovule and funicle
C. In aquatic plants such as water hyacinth and water lily, pollination occurs by water
D. The primary endosperm nucleus is triploid

Answer

To solve the question, we need to analyze each of the provided statements and identify which one is incorrect.

### Step-by-Step Solution:

1. **Statement Analysis**:
- **Statement 1**: "Apetum nourishes the developing pollen grains."
- This statement is actually about the tapetum, not "apetum." The tapetum is responsible for nourishing the developing pollen grains. Therefore, this statement is correct.

- **Statement 2**: "Hylam represents the junction between ovula and fungal."
- The hylam is indeed the junction between the ovule and the funiculus (not "fungal"). This statement is also correct.

- **Statement 3**: "In aquatic plants such as water hyacinth and water lily, pollination occurs by water."
- This statement is incorrect. While these plants are aquatic, they are primarily pollinated by wind or insects, not by water. Therefore, this is the incorrect statement we are looking for.

- **Statement 4**: "Primary endosperm nucleus is triploid."
- This statement is correct. The primary endosperm nucleus is formed when the diploid polar nuclei fuse with a haploid male gamete, resulting in a triploid (3N) condition.

2. **Conclusion**:
- The incorrect statement among the options provided is **Statement 3**.

### Final Answer:
The incorrect option is **Statement 3**: "In aquatic plants such as water hyacinth and water lily, pollination occurs by water."