Alder tree pollen, SEM

Alder tree pollen, SEM

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This image is part of the feature Pollen: a closer look

Credit: EYE OF SCIENCE/SCIENCE PHOTO LIBRARY

Caption: Alder tree pollen. Coloured scanning electron micrograph (SEM) of a pollen grain (yellow) from an alder tree (Alnus sp.). A pollen grain contains a male sex cell from a flowering plant. Millions of pollen grains are produced by each flowering plant. In the process of pollination, some of these pollen grains are transported from a flower's anthers to the female reproductive parts of a plant. This allows the female and male sex cells to combine in the formation of a seed. Alder trees are fast-growing deciduous trees found mostly in the temperate areas of the Northern Hemisphere. Magnification: x3200 at 10 centimetres wide.

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Keywords: alder, alnus, biological, biology, botanical, botany, coloured, false-colour, false-coloured, gamete, male, nature, one, pollen, pollen grain, reproduction, reproductive, scanning electron micrograph, scanning electron microscope, sem, single, tree

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