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Animated coloured scanning electron micrograph (SEM) of two types of pollen grains. At the start is shown pollen from a sunflower (Helianthus annuus), before the view pulls back to show the much larger pollen grains of the hollyhock (Althaea rosa). The outer walls (exine) of each pollen grain have a spiky structure, thought to help the grains adhere to their insect pollinators. The pollen is transferred to the stigma of the flower, where it fertilises the ovules in the female ovary to form seeds.
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