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Sunflower pollen, SEM

Sunflower pollen, SEM

C002/3595

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Credit

SUSUMU NISHINAGA / SCIENCE PHOTO LIBRARY SUSUMU NISHINAGA / SCIENCE PHOTO LIBRARY

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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