Sunflower pollen, SEM

Sunflower pollen, SEM

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Caption: Sunflower pollen grains. Coloured scanning electron micrograph (SEM) of pollen grains on the stigma (female reproductive structure) of a sunflower (Helianthus annuus). The grains have a spiked outer wall (exine), which may assist in their dispersal by improving their adherence to pollinating insects. The characteristic surface of pollen grains is used by botanists to recognise and classify plants. Pollen grains are the male sex cells of a flowering plant.

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Keywords: asteraceae, biological, biology, botanical, botany, cells, coloured, compositae, dispersal, exine, false-colour, false-coloured, gamete, gametes, grain, grains, helianthus annuus, male, nature, outer wall, pollen, reproduction, reproductive, scanning electron micrograph, scanning electron microscope, sem, sex cell, spiked, spikes, spiky, stigma, sunflower

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