Gymnosperm

Gymnosperm - Gymnosperms Phylum Pinophytapines,spruce, fir...

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Gymnosperms Phylum Pinophyta —pines,spruce, fir Un-named phylum—redwoods et al. Phylum Ginkgophyta Ginkgo Phylum Cyadophyta —cycads Phylum Gnetophyta Ephedra & Welwitschia
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The Seed Plants Are a Monophyletic Group Land plants Seed plants Gymnosperms Cycads Gingko Redwoods et al. Gnetophytes Pines et al. Angiosperms
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Gymnosperm characteristics Life cycle—sporic with sporophyte dominant , gametophyte dependent Last group of plants with archegonia First group of plants with non-motile sperm—allows life in dryer habitats First group of plants with seeds, but not enclosed within a fruit i.e. naked seeds Heterosporous
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Seed Components All seeds consist of the following: 1. an embryo plant with a root, a stem, and leaves 2. Stored food 3. Protective covering (seed coat / testa) Seedcoat Stored food Embryo
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Phylum Pinophyta Pinus
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Pine summary life cycle
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Male strobilus l.s. microsporangium microsporophyll developing microspores / pollen Male strobili Microsporangia are formed on the underside of each microsporophyll (cone scale) Within each microsporangium, microspore mother cells (2n) undergo meiosis to produce microspores (n)
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Gymnosperm - Gymnosperms Phylum Pinophytapines,spruce, fir...

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