By the presence of which of the following can the family Brassicaceae be immediately identified ?

Options

A. Inferior ovary and cruciform corolla
B. Tetradynamous stamens and axile placentation
C. Tetradynamous stamens and replum
D. Cruciform corolla and indehiscent fruit

Answer

To identify the family Brassicaceae, we need to focus on specific characteristics that are unique to this family. Here’s a step-by-step solution to the question:

### Step-by-Step Solution:

1. **Understand the Family Brassicaceae**: The Brassicaceae family, also known as the mustard family, includes many plants that are important in agriculture and horticulture.

2. **Identify Key Features**: The family is characterized by specific floral structures, particularly the arrangement of stamens and the structure of the gynoecium.

3. **Stamen Arrangement**: In Brassicaceae, the stamens are arranged in a unique way known as the **tetradynamous condition**. This means there are:
- **Four long stamens**: These are the inner stamens.
- **Two short stamens**: These are the outer stamens.
- This specific arrangement is a defining characteristic of the family.

4. **Gynoecium Structure**: Another important feature is the presence of a structure called the **replum**. The replum is:
- A false partition that separates two carpels in the gynoecium.
- It is a key characteristic that differentiates Brassicaceae from other families.

5. **Evaluate Options**: Based on the characteristics discussed:
- **Tetradynamous stamens** is a correct option.
- **Replum** is also a correct option.
- Other options like inferior ovary, cruciform corolla, and indehiscent fruit do not specifically identify the Brassicaceae family.

6. **Conclusion**: The family Brassicaceae can be immediately identified by the presence of **tetradynamous stamens** and the structure of the gynoecium which includes the **replum**.

### Final Answer:
The family Brassicaceae can be immediately identified by the presence of **tetradynamous stamens**.

---