Concept: This question tests your knowledge of floral formulae and their association with specific plant families, a key aspect of plant taxonomy.

Why (B) is correct: The given floral formula, $\mathrm{EBr}\oplus \text{♀}{\mathrm{K}}_{(5)}{\mathrm{C}}_{(5)}{\mathrm{A}}_0{\underline{\mathrm{G}}}_{(3)}$, indicates several characteristic features:

• $\mathrm{EBr}$: Ebracteate (no bracts).
• $\oplus$: Actinomorphic symmetry (radial symmetry).
• $\text{♀}$: Female flower (unisexual).
• ${\mathrm{K}}_{(5)}$: Calyx with 5 fused sepals.
• ${\mathrm{C}}_{(5)}$: Corolla with 5 fused petals.
• ${\mathrm{A}}_0$: Androecium absent (no stamens).
• ${\underline{\mathrm{G}}}_{(3)}$: Gynoecium with 3 fused carpels and a superior ovary.

These features, particularly the unisexual flower (often monoecious or dioecious plants), actinomorphic symmetry, pentamerous fused sepals and petals, and tricarpellary superior ovary, are characteristic of the family Cucurbitaceae (e.g., gourds, pumpkins, cucumbers). The formula specifically represents a female flower of a cucurbit.

Why other options are wrong:

• (A) Solanaceae: Typically has bisexual flowers, epipetalous stamens, and a bicarpellary ovary.
• (C) Gramineae (Poaceae): Has highly reduced flowers (florets) with lodicules instead of sepals/petals, and a monocarpellary ovary.
• (D) Liliaceae: Has trimerous flowers, perianth (tepals), and a tricarpellary superior ovary, but typically bisexual flowers and 6 stamens.

NEET Tip: Memorize the key distinguishing features and floral formulae of important families like Solanaceae, Liliaceae, Fabaceae, and Poaceae. Pay attention to symmetry, number of parts, fusion, and ovary position.

Correct Answer: (B)