Hibiscus pollen grains, SEM

Hibiscus pollen grains, SEM

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Caption: Chinese hibiscus pollen. Coloured scanning electron micrograph (SEM) of pollen grains on the anther of a Chinese hibiscus (Hibiscus rosa-sinensis) flower. Pollen grains are the male gametes (sex cells) of a plant. The grain has a highly sculptured outer wall (exine), which may assist in its dispersal by improving its adherence to pollinating insects. The characteristic surface of a pollen grain is used by botanists to recognise and classify plants. Pollen grains are microscopic, usually about 15 to 100 microns across, and just a pinch of pollen powder contains thousands and thousands of grains. Magnification: x400 when printed at 10 centimetres wide.

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