Pollen grains must land on the stigma while still viable to achieve fertilization.
Una volta rilasciati, i granuli pollinici devono atterrare sullo stigma prima di perdere la vitalità, se devono portare alla fecondazione.
| Text | When once they are shed, pollen grains have to land on the stigma before they lose viability if they have to bring about fertilisation. |
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