Which of the following is incorrect pairing of plant and the characteristic ?

Options

A. Variation in the length of filaments within a flower : Salvia
B. Polycarpellary syncarpous gynoecium : Tomato
C. Ovary is one - charmbered but it becomes two chambered due to formation of a false septum : Argemone
D. The gynoecium occupies the highest position while the other parts are situated below it : Guava

Answer

To solve the question regarding the incorrect pairing of a plant and its characteristic, we will analyze each option one by one.

### Step-by-Step Solution:

1. **Identify the first statement**:
- **Pair**: Variation in length of filaments within a flower - **Plant**: Salvia
- **Analysis**: Salvia exhibits a condition called "dynamous," where the stamens (filaments) are of unequal lengths. This pairing is **correct**.

2. **Identify the second statement**:
- **Pair**: Polycarpillary syncarpous gynoecium - **Plant**: Tomato
- **Analysis**: In tomatoes, the gynoecium consists of multiple carpels that are fused together, which is characteristic of a polycarpillary syncarpous structure. This pairing is **correct**.

3. **Identify the third statement**:
- **Pair**: Ovary is one-chambered but becomes two-chambered due to the formation of the false septum - **Plant**: Argemone
- **Analysis**: In the Brassicaceae family, Argemone has an ovary that starts as unilocular (one chamber) and can develop a false septum, making it appear bilocular (two chambers). This pairing is **correct**.

4. **Identify the fourth statement**:
- **Pair**: Gynoecium occupies the highest position while other parts are situated below it - **Plant**: Guava
- **Analysis**: The description given here is incorrect for guava. In guava, the gynoecium is situated below the other floral parts, making it a hypogynous flower. The correct example for a flower with the gynoecium at the highest position (epigynous) would be Mustard. Therefore, this pairing is **incorrect**.

### Conclusion:
The incorrect pairing is:
- **Gynoecium occupies the highest position while other parts are situated below it - Guava**.