- A Physical separation of stamens and pistil onto entirely different flowers altogether
- B Molecular recognition between pollen and pistil S-gene products rejecting same-genotype pollen
- C Releasing volatile insect repellents that actively prevent pollinator visits to the flower
- D Producing no functional pollen grains whatsoever throughout anther development
Correct answer: B. Molecular recognition between pollen and pistil S-gene products rejecting same-genotype pollen
Explanation: SI: stigma or pistil cells express S-gene products that recognize matching pollen S-alleles. If pistil and pollen share S alleles, pollen tube growth is inhibited, preventing inbreeding.
Concept context
Flower structure, pollination, double fertilization, and seed/fruit development — the highest-scoring Class 12 biology chapter in NEET.
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