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The pistil's ability to discriminate between compatible and incompatible pollen depends on:
AThe size of the pollen alone
BThe shape of the stigma alone
CA chemical dialogue mediated by interactions between pollen and pistil components
DThe colour of the pollen
Answer & Solution
Correct answer: C. A chemical dialogue mediated by interactions between pollen and pistil components
**Pollen-pistil recognition** is a chemical dialogue: pollen-surface molecules interact with stigma-surface molecules → pistil decides to promote pollen-tube growth (compatible) or inhibit it (incompatible / self-incompatible).
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