Pollen grain

Pollen grains (from the greek palynos for dust or pollen) contain the male gametophyte (microgametophyte) phase of the plant.
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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.
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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 are transported from the male stamen to the female stigma in a process called pollination.
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All pollen grains — incompatible as well as compatible — germinate forming pollen tubes that begin to grow down the style.
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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. From each pollen grain, a pollen tube grows out attempting to travel into the ovary by creating a path.
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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.
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minute spore that grows into a male gametophyte; in seed plants the microspore is the young pollen grain
Source: Noland, George B. 1983. General Biology, 11th Edition. St. Louis, MO. C. V. Mosby
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pollen tube -- In seed plants, the extension of the male gametophyte as it emerges from the pollen grain in search of the female gametophyte.
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: 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
.
Double heterozygote ...
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In these the gametophyte stage is completely reduced, and the sporophyte begins life inside an enclosure called a seed, which develops while on the parent plant, and with fertilisation by means of pollen grains.
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