- A Leaf identity only, having absolutely no documented role whatsoever in determining the fate of any floral organ
- B Which floral organs form in which whorl (A genes: sepals/petals, B genes: petals/stamens, C genes: stamens/carpels)
- C Root system formation specifically through direct control over lateral root primordia initiation and emergence
- D Pollen tube growth rate and its precise chemotropic guidance pathway toward the awaiting ovule structure
Correct answer: B. Which floral organs form in which whorl (A genes: sepals/petals, B genes: petals/stamens, C genes: stamens/carpels)
Explanation: ABC model of floral development: A alone = sepals; A+B = petals; B+C = stamens; C alone = carpels. MADS-box TFs (AP1, AP3/PI, AG) control floral organ identity in Arabidopsis.
Concept context
Flower structure, pollination, double fertilization, and seed/fruit development — the highest-scoring Class 12 biology chapter in NEET.
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