- A Root system development through specific control over the formation of lateral root primordia along the main root structure
- B Formation of any floral organs (in sep1 sep2 sep3 triple mutants, all organs become leaf-like despite functional ABC genes)
- C Pollen tube guidance alone, specifically directing tube growth toward the micropyle opening of the developing ovule
- D Seed dormancy mechanisms that are regulated largely independently of any floral organ identity gene activity present
Correct answer: B. Formation of any floral organs (in sep1 sep2 sep3 triple mutants, all organs become leaf-like despite functional ABC genes)
Explanation: SEP genes (SEP1-4): essential cofactors for floral homeotic MADS proteins. Without SEP, ABC proteins cannot form active tetrameric complexes. All organs revert to leaf-like structures in sep triple mutants.
Concept context
Flower structure, pollination, double fertilization, and seed/fruit development — the highest-scoring Class 12 biology chapter in NEET.
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