Pollen grains

Pollen grains

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Credit: BSIP/SCIENCE PHOTO LIBRARY

Caption: Pollen grains. Coloured scanning electron micrograph (SEM) of pollen grains from a false acacia tree (Robinia pseudoacacia). There is great variation in the size, shape and surface texture of pollen. The outer wall is highly sculpted in many plants, which may assist in dispersal. The characteristic surface of a plant's pollen grains is used by botanists to recognise and classify species. Each grain contains a male gamete, which fertilises the eggs or ovules, initiating the formation of the plant seeds. The false acacia originated in eastern North America. Magnification: x1900 at 35mm size.

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Keywords: biology, botany, coloured, eastern american, false acacia, flora, male gametes, nature, plant, plants, pollen grains, reproduction, reproductive, robinia pseudoacacia, scanning electron micrograph, sem, tree, united states, usa, wildlife

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