Pollen grains of the sunflower

Pollen grains of the sunflower

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Credit: BSIP PIR/SCIENCE PHOTO LIBRARY

Caption: Pollen grains. Coloured scanning electron micro- graph (SEM) of pollen grains of the sunflower, Helianthus sp. . Pollen grain size, shape and surface texture differ from one plant species to another. The outer wall (exine) of the pollen in many plant species is highly sculpted which may assist in wind, water or insect dispersal. This pollen sculpting is also used by botanists to recognise plant species. Pores in the pollen wall help in water regulation and germination. Pollen grains contain the plant's male gametes which fertilise the female egg or ovule, with subsequent formation of plant seeds. Pollen causes hay fever. Magnification: x1000 at 35mm size.

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Keywords: botany, cause, grain, hay fever, hayfever, helianthus, helianthus sp., nature, of pollen, plant, plants, pollen, pollen grains, pollinosis, reproduction, reproductive, sunflower, type

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