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pollen grain

   Also found in: Medical, Encyclopedia, Wikipedia, Hutchinson 0.01 sec.
pollen grain
n.
A microspore of seed plants, containing a male gametophyte.


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Outdoor allergens are almost always in the form of pollen grains These grains might belong to trees, grasses, and even weeds Outdoor allergens are almost always in the form of pollen grains.
In these sediment layers, Bernhardt and his colleagues took samples of embedded ancient pollen grains to look for shifts from primarily native plants to those associated with agriculture.
A hard coat covering the pollen grain protects the sperm cells during the process of their movement between the stamens of the flower to the pistil of the next flower.
 
 
 
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