pollen grains The containers for male gametophytes of seed plants produced in a microsporangium by meiosis. Microspores produced by seed plants that contain the male gametophyte. PICTURE ...
pollen grain
A small structure of higher plants that contains haploid male gamete nuclei and is surrounded by a double wall, the exine and intine.
Pollen grains (from the greek palynos for dust or pollen) contain the male gametophyte (microgametophyte) phase of the plant.
pollen grain The structure into which a haploid microspore develops; contains a halpoid tube nucleus and two haploid sperm nuclei at maturity.
pollen The collective term for pollen grains, the male gametophytes.
All pollen grains — incompatible as well as compatible — germinate forming pollen tubes that begin to grow down the style.
tube formed by a pollen grain; transports sperms to the eggs in an ovary
Source: Noland, George B. 1983. General Biology, 11th Edition. St. Louis, MO. C. V. Mosby
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After the pistil is pollinated, the pollen grain germinates in a response to a sugary fluid secreted by the mature stigma called semen.
The male organ of angiosperm flowers where pollen grains are produced in the anther component of the stamen. These pollen grains are produced by meiosis and provide the building blocks required for reproduction of an angiosperm species.
[Gk. anthos, flower]
The terminal pollen sac of a stamen, inside which pollen grains with male gametes form in the flower of an angiosperm.
antheridium pl. antheridia
In plants, the male gametangium, a moist chamber in which gametes develop.
pollen tube -- In seed plants, the extension of the male gametophyte as it emerges from the pollen grain in search of the female gametophyte.
Use this animation to compare the relative sizes of cells and organisms sitting on a pinhead. Nearly invisible without magnification, dust mites dwarf pollen grains and human cells. In turn, bacteria and viruses are even smaller.
pollen - in plants, the male germ cells produced in the anther. When ripe, pollen sacs at the end of the anthers split open to release the pollen. Each ripe pollen grain contains two male nuclei equivalent to male gametes. (Glossary of PM) ...
Double fertilization: The union of one male gametophyte nucleus with the ovum nucleus and another male gametophyte nucleus with the polar nuclei to form the endosperm in seed plants. See also pollen grain.
 See also: Plant, Species, Cells, Sperm, Organ
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