Select the incorrect option w.r.t. male reproductive system of a flower.

Options

A. It is third whorl of the flower which arises just inner to the calyx and is composed of stamens.
B. A stamen consists of anther and filament
C. Anthers are usually bilobed
D. Staminode is the sterile stamen

Answer

To solve the question regarding the incorrect option related to the male reproductive system of a flower, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Structure of the Flower**:
- The male reproductive system of a flower is known as the **Androsium**.
- It consists of **stamens**, which are the male reproductive organs.

2. **Identify the Parts of the Stamen**:
- Each stamen is made up of two parts:
- **Anther**: The upper part that is usually bilobed and contains microsporangia.
- **Filament**: The stalk that supports the anther.

3. **Know the Arrangement of Floral Whorls**:
- Flowers have different whorls:
- **Calyx**: The outermost whorl made of sepals.
- **Corolla**: The whorl inside the calyx made of petals.
- **Androsium**: The male reproductive whorl, which consists of stamens, located inside the corolla.
- **Gynosium**: The female reproductive whorl, consisting of carpels, located at the center.

4. **Analyze the Statements**:
- The question asks to select the incorrect option regarding the male reproductive system.
- One statement claims that the androsium arises just inner to the calyx. This is incorrect because the androsium is actually located inner to the corolla, not the calyx.

5. **Conclusion**:
- The incorrect statement is the one that says the androsium arises inner to the calyx. Therefore, this statement is the answer to the question.

### Final Answer:
- The incorrect option is the one that states: "The androsium arises just inner to the calyx."

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