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24099C

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Image #   24099C
Name:   Daisy pollen (Helianthus sp.)
Copyright:   Copyright 2004 Dennis Kunkel Microscopy, Inc.
Description:   Caption: Daisy pollen (Helianthus sp.). The outer wall (exine) has many small spiky projections. The pollen gets caught in the body hairs of insects visiting the flower. Cross pollination occurs when insects fly to another similar flower and pollen is left behind. Pollen contains the male reproductive cells of a plant. When the pollen grain, containing the male gametes, lands on the stigma of a flower, it germinates. A pollen tube grows out from the germinal pore, down through the stigma, to the ovary. The male nuclei pass down the tube, fertilize the ovules and seed is formed. Humans can also be allergic to daisy pollen.
Magnification*: x260
Type: SEM
    *(Magnifications are based on a 35mm slide image of 24mm in the narrow dimension.)
Keywords:   24099C 03.01.04 allergen allergenic pollen allergic Asteraceae compositae composite flower cross pollination daisy flower daisy pollen exine Helianthus plant plant reproduction plants pollen pollen wall SEM

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