Alder pollen grain, SEM

Alder pollen grain, SEM

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Credit: MARTIN OEGGERLI/SCIENCE PHOTO LIBRARY

Caption: Alder pollen grain, coloured scanning electron micrograph (SEM). The pollen grain of the alder plant (Alnus) is highly allergic. It is transported by the wind, and so is light with a smooth, non-sticky surface to aid its dispersal over distances of thousands of kilometres. Pollen grains are reproductive structures produced by the male parts of flowering plants.

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Keywords: 1, alder, allergen, allergic, allergy, alnus, angiosperm, angiosperms, biological, biology, botanical, botany, coloured, false-color, false-colored, false-coloured, flora, flower, flowering plants, hayfever, male sex cells, nature, one, plant reproduction, pollen, pollen grain, reproductive, scanning electron micrograph, scanning electron microscope, sem, single

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