To solve the question regarding the characteristics of the family Fabaceae, we will analyze each option provided and determine which accurately describes the family.
### Step-by-Step Solution:
1. **Understanding the Family Fabaceae**:
- Fabaceae, also known as Leguminosae, is a family of flowering plants commonly referred to as legumes. It was previously known as Papilionaceae.
2. **Analyzing the Options**:
- **Option 1**: "Pinnately compound leaf, zygomorphic flower, racemose inflorescence."
- **Pinnately Compound Leaf**: This is correct as many plants in the Fabaceae family have leaves that are pinnately compound, meaning they consist of multiple leaflets arranged along a central axis.
- **Zygomorphic Flower**: This is also correct. Flowers in this family are often zygomorphic, meaning they can be divided into two equal halves along one plane.
- **Racemose Inflorescence**: This is correct as well. In racemose inflorescence, the flowers are borne on a central stem and do not terminate in a flower, allowing continuous growth.
- **Option 2**: "Reticulate venation, zygomorphic, simose."
- **Reticulate Venation**: This is correct for many plants, but not all in the family Fabaceae exhibit this.
- **Zygomorphic**: Correct.
- **Simose**: This is incorrect. Simose inflorescence involves the main axis terminating in a flower, which is not characteristic of Fabaceae.
- **Option 3**: "Extipulate, actinomorphic."
- **Extipulate**: This is incorrect as many Fabaceae plants have stipules.
- **Actinomorphic**: This is incorrect; flowers are typically zygomorphic.
- **Option 4**: "Alternate leaf, bisexual, bicarpillary."
- **Alternate Leaf**: This can be correct, but not all species have alternate leaves.
- **Bisexual**: This is correct as most flowers are bisexual.
- **Bicarpillary**: This is incorrect; many species are monocarpillary (having one carpel).
3. **Conclusion**:
- The correct option that describes the characteristics of the family Fabaceae is **Option 1**: "Pinnately compound leaf, zygomorphic flower, racemose inflorescence."
