All these trees belong to one phylum of gymnosperms, Pinophyta—the conifers, ... At maturity, the scales of the cones separate, and the seeds are released into the air to be carried sometimes considerable distances by the wind. Click on the ANIMATION tab to follow the life cycle of a typical pine tree.
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bcs.whfreeman.com/thelifewire/content/chp30/30020.html
bcs.whfreeman.com/thelifewire/content/chp30/30020.html
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The life cycle of "gymnosperms" depicts a dominant sporophyte and reduced gametophytes with the female gametophyte retained on the sporophyte (see illustration of conifer life cycle).
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courses.washington.edu/bot113/summer/WebReadings/gymnos...
courses.washington.edu/bot113/summer/WebReadings/gymnospermPlants/gymnosperms.html
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Gymnosperm life cycle; ... Text material 2005 by Steven M. Carr...
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www.mun.ca/biology/scarr/Gymnospermae.html
www.mun.ca/biology/scarr/Gymnospermae.html
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Life Cycle of Seed Plants ... The life cycle of flowering plants is similar to that of gymnosperms. It involves alternation of generations. A diploid sporophyte alternates with a haploid gametophyte.
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faculty.clintoncc.suny.edu/faculty/Michael.Gregory/file...
faculty.clintoncc.suny.edu/faculty/Michael.Gregory/files/Bio%20102/Bio%20102%20lectures/Seed%20Plants/seed%20plants.htm
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two of the major classes of tracheophytes are gymnosperms (conifers) and angiosperms (flowering plants). Tracheophytes, unlike bryophytes, have developed seeds that encase and protect their embryos. The dominant phase in the tracheophyte life cycle is the diploid (sporophyte) stage.
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www.sparknotes.com/biology/plants/lifecycle/section1.ht...
www.sparknotes.com/biology/plants/lifecycle/section1.html
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The Life Cycle of Gymnosperms. Gymnosperms are plants that have seeds but no flowers or fruits. The term originates from "gymnos," meaning naked, and "sperm," meaning seed. Gymnosperms developed during the Paleozoic Era and... ... eHow Article: The Life Cycle of Gymnosperms...
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www.ehow.com/about_5456257_life-cycle-gymnosperms.html
www.ehow.com/about_5456257_life-cycle-gymnosperms.html
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The pollen grain, containing the male gametophyte (also known as the microgametophyte) arrives on the wind to the mature ovulate cone. At this time the pine cone is usually green, and the scales are closed tight to protect the developing structures inside. ... ; Ovulate pine cone ... The pollen grain enters the micropylar chamber,
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hypnea.botany.uwc.ac.za/phylogeny/bioCycles/sporic8e.ht...
hypnea.botany.uwc.ac.za/phylogeny/bioCycles/sporic8e.htm
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Within the ovule, the megaspore mother cell undergoes meiosis and produces four megaspores, each of which is haploid (N). Most commonly, only one of the four megaspores is viable ... The megaspore develops into the female gametophyte, ... The haploid nucleus within the megaspore undergoes around 11 nuclear divisions by mitosis,
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hypnea.botany.uwc.ac.za/phylogeny/bioCycles/sporic8d.ht...
hypnea.botany.uwc.ac.za/phylogeny/bioCycles/sporic8d.htm
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Click on a section of Gymnosperm Life Cycle for more information ... The dominant generation of the gymnosperm life cycle is the long lived sporophyte, and the gametophyte generation is inconspicuous. The male gametophyte, the pollen grain, is not dependent on water for sperm transfer.
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fybio.bio.usyd.edu.au/VLE/L1/ResourceCentre/GraphicFile...
fybio.bio.usyd.edu.au/VLE/L1/ResourceCentre/GraphicFiles/FS_LCPine.html
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