Which is not a correct explanation of cross pollination

Options

A. Pollen grains of male flowers are transferred to stigma of female flowers
B. Pollen grains are transferred from one flower to another flower of another plant of the same species
C. Pollen grains are transferred from one flower to another flower situated on the same species
D. Pollen grains of one flower are transferred to the stigma of the same flower.

Answer

To determine which statement is not a correct explanation of cross-pollination, let's analyze the provided options step by step.

### Step-by-Step Solution:

1. **Understanding Cross-Pollination**:
- Cross-pollination is the process where pollen grains from the male reproductive part of one flower are transferred to the stigma of a different flower, typically of the same species. This promotes genetic diversity.

2. **Analyzing the Statements**:
- **Statement 1**: "Pollen grains of male flowers are transferred to the stigma of the female flowers."
- This statement describes a key aspect of cross-pollination. It is correct.

- **Statement 2**: "Pollen grains are transferred from one flower to another flower of another plant of the same species."
- This statement accurately defines cross-pollination, as it involves the transfer of pollen between different plants of the same species. This is correct.

- **Statement 3**: "Pollen grains are transferred from one flower to another flower situated of the same species."
- This statement also correctly describes cross-pollination, emphasizing that the transfer occurs between flowers of the same species. This is correct.

- **Statement 4**: "Pollen grains of one flower are transferred to the stigma of the same flower."
- This statement describes self-pollination, not cross-pollination. In cross-pollination, the pollen must come from a different flower. Therefore, this statement is not a correct explanation of cross-pollination.

3. **Conclusion**:
- The statement that is not a correct explanation of cross-pollination is **Statement 4**.

### Final Answer:
The correct option that is not a correct explanation of cross-pollination is **option number 4**.

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