Concept: This question tests your knowledge of floral morphology, specifically the type of aestivation found in different plant families.

Why (B) is correct: Vexillary aestivation is a characteristic feature of the family Fabaceae (also known as Papilionaceae or Leguminosae). In this type of aestivation, the largest petal (called the standard or vexillum) overlaps the two lateral petals (wings), which in turn overlap the two smallest anterior petals (keel). This arrangement is typical of pea-like flowers.

Why other options are wrong:

• (A) Brassicaceae: This family typically shows valvate aestivation or imbricate aestivation, not vexillary.
• (C) Asteraceae: This family has capitulum inflorescence and various aestivation types, but not vexillary.
• (D) Solanaceae: This family often exhibits valvate or imbricate aestivation, but not vexillary.

NEET Tip: Remember that vexillary aestivation is a strong identifying feature for the Fabaceae family, often seen in plants like peas, beans, and lentils.

Correct Answer: (B)