Genera Petunia and Datura belong to the family

The correct option is Solanaceae.

Step-by-Step Explanation:

1. Understanding Families in Plant Taxonomy:
In biological classification, plants that share similar vegetative and reproductive features are grouped together into taxonomic categories called families. Genera (plural of genus) sharing common characteristics are placed under the same family.

2. Analyzing the Genera Petunia and Datura:
Both Petunia and Datura are genera of flowering plants. They exhibit characteristics such as a bisexual, actinomorphic flower structure, five fused sepals (persistent in nature), five fused petals, five epipetalous stamens, and a bicarpellary, syncarpous superior ovary with swollen placenta containing many ovules.

3. Identifying the Family:
These vegetative and floral characteristics are the hallmark features of the nightshade family, scientifically known as Solanaceae. Other common plants belonging to this family include potato (Solanum tuberosum), tomato (Solanum lycopersicum), and brinjal (Solanum melongena).

4. Comparing with Other Options:
- Fabaceae: This is the legume or pea family, characterized by zygomorphic flowers, diadelphous stamens, and marginal placentation.
- Liliaceae: This is the lily family, which is a monocot family characterized by trimerous flowers, six tepals, and axile placentation.

Therefore, the genera Petunia and Datura belong to the family Solanaceae.