Pollen from Ragweed flower

Pollen from Ragweed flower

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Caption: Ragweed pollen grains. Coloured Scanning Electron Micrograph (SEM) of pollen grains from a ragweed (Ambrosia artemisiifolia). Pollen grain size, shape and surface texture differs from one plant species to another. The outer wall (exine) of these grains is highly sculpted and may assist in wind, water or insect dispersal. Such pollen sculpting variation between species is used by botanists to recognise plant species. Pollen grains contain the plant's male gametes which fertilise the female egg or ovule, with subsequent formation of plant seeds. Pollen also causes allergies and hay fever. Magnification: x1040 at 6x6cm size.

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Keywords: ambrosia artemisiifolia, botany, cause, grain, hay fever, hayfever, nature, of pollen, plant, plants, polle, pollen, pollen grains, pollinosis, ragweed, reproduction, reproductive, sem

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