Hollyhock pollen

Hollyhock pollen

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Caption: Pollen. Coloured scanning electron micrograph (SEM) of a pollen grain of the garden hollyhock, Althaea rosa. Its outer wall (exine) has a spiky structure. When the pollen grain, containing the male gametes, lands on the stigma of a flower of the same species, it germinates. A pollen tube grows from the pollen grain & down to the flower's ovaries. The ovules are then fertilised & a seed is formed. Magnification: x200 at 6x6cm size.

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Keywords: allergen, allergy cause, althaea rosa, botany, coloured, garden hollyhock, grain, hollyhock, nature, plant, plants, pollen, pollen of, reproduction, reproductive, scanning electron micrograph, sem, sneeze, sneezing causing

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