Keel petals in Fabaceae are

Options

A. Small and posterior
B. Large and anterior
C. Small and lateral
D. Small and anterior

Answer

### Step-by-Step Solution:

1. **Understanding the Fabaceae Family**: The question is about the keel petals in the Fabaceae family, which is known for its unique flower structure.

2. **Identifying Petal Types**: In Fabaceae, there are typically five petals. These petals can be categorized into three types:
- **Standard Petal**: This is the largest petal, often referred to as the "banner."
- **Wing Petals**: There are two lateral petals that are smaller than the standard petal.
- **Keel Petals**: These are the smallest petals and are located at the bottom of the flower.

3. **Estivation**: The arrangement of petals in Fabaceae is known as vexillary or papillonaceous estivation. This means that the petals are arranged in a specific overlapping pattern.

4. **Analyzing the Options**:
- **Small and Posterior**: This option is incorrect because the keel petals are not positioned at the back.
- **Large and Anterior**: This option is incorrect because the keel petals are not large; they are the smallest.
- **Small and Lateral**: This option is incorrect because the keel petals are not lateral; they are at the bottom.
- **Small and Anterior**: This option is correct because the keel petals are indeed small and located at the anterior position of the flower.

5. **Conclusion**: The correct answer is that the keel petals in Fabaceae are **small and anterior**.