Pollen grains have a hard coat that protects the sperm cells during the process of their movement between the stamens to the pistil of flowering plants or from the male cone to the female cone of coniferous plants.
Zempova abe elingenamikhono kanzima eyenziwe sporopollenin ukuthi ivikela gametophytes phakathi kwenqubo ukunyakaza kwabo kusukela stamens kuya pistil ezimila eziqhakazayo, noma kusukela Isigaxa zesilisa Isigaxa lensikazi izitshalo coniferous.