One of the following statements does not apply to the Cruciferae family ?

Options

A. Flowers are tetramerous
B. Ovary shows false septum (replum) and parietal placentation
C. Fruit is siliqua/silicula
D. Androecium is didynamous

Answer

To determine which statement does not apply to the Cruciferae family (also known as Brassicaceae), we will analyze each of the provided statements one by one.

### Step-by-Step Solution:

1. **Understanding the Family**: The Cruciferae family, commonly known as the mustard family, includes plants like Brassica rapa and other species.

2. **Analyzing the Statements**:
- **Statement A**: "Flowers are tetramerous."
- This statement is true. The flowers of the Cruciferae family typically have four petals, which makes them tetramerous.

- **Statement B**: "Ovary shows false septum i.e. replum and parietal placentation."
- This statement is also true. The ovary in Cruciferae has a false septum (replum) and exhibits parietal placentation.

- **Statement C**: "Fruit is silica or silicula."
- This statement is true as well. The fruits of the Cruciferae family are often siliques or silicles.

- **Statement D**: "Androsium is didynamous."
- This statement is false. The androsium of Cruciferae is typically tetradynamous, meaning it has four long stamens and two short stamens, not didynamous (which refers to having two pairs of stamens).

3. **Conclusion**: The statement that does not apply to the Cruciferae family is option D: "Androsium is didynamous."

### Final Answer:
The statement that does not apply to the Cruciferae family is: **"Androsium is didynamous."**

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