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Pollinisation Chez certaines espèces, la fécondation des gamètes femelles par les gamètes mâles de la même fleur est possible, voire obligatoire. Dans les autres cas, elle est rendue Impossible par divers mécanismes d'incompatibilité. La fécondation croisée implique une mobilité des grains de pollen d'une plante à une autre. Dans une majorité de cas, la pollinisation repose sur une collaboration entre plante et pollinisateur en relation avec la structure florale; le vent peut aussi transporter le pollen. A l'issue de la fécondation, la fleur qui porte des ovules se transforme en un fruit qui renferme des graine
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