Gymnosperm

gymnosperm
plant whose seeds are not enclosed by carpels, that is, ovary; contrast to angiosperm
Source: Noland, George B. 1983. General Biology, 11th Edition. St. Louis, MO. C. V. Mosby ...
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Definition of gymnosperm :
a vascular plant that bears naked seeds not enclosed in any specialized chambers.
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Gymnosperms have seeds but not fruits or flowers. Gymnos means naked, sperm means seed: gymnosperm = naked seeds. Gymnosperms developed during the Paleozoic Era and became dominant during the early Mesozoic Era.
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Gymnosperm seedlings also have cotyledons, and these are typically numerous (multicotyledonous) but variable.
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gymnosperm -- n. A plant that produces seeds, which are not enclosed; includes any seed plant that does not produce flowers.
gynostemium -- The central reproductive stalk of an orchid, which consists of a stamen and pistil fused together.
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Gymnosperms
Fossil from the Devonian period reveal fernlike plants that were heterosporous; that is, produced two kinds of spores.
microspores (male) and
megaspores (female).
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gymnosperms: vascular plants having naked seeds, such as the conifers.
H
haploid: cells containing one copy of each chromosome.
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gymnosperm
(jim-noh-spurm) [Gk. gymnos, naked + sperma, seed]
A vascular plant that bears naked seeds not enclosed in any specialized chambers.
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gymnosperm Seed-producing plants in which the seed is not enclosed in an ovary as in angiospems. Ginkgos, cycads, and conifers are examples.
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Gymnosperm
(Gr.
gymnos
=naked; sperm=seed): Woody plants whose life histories include alternation of generations and ovules are not enclosed in a carpel. The pollen typically germinates on the surface of the ovule. A
superclass ...
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Pinaceae Gymnosperm family in which the leaves are needle-shaped
(pine; -aceae = ending for plant families)
Pistil a "female" plant part consisting of ovary style and stigma
(pistillum pestle = to pound beat) ...
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Early seed plants are referred to as gymnosperms (naked seeds), as the seed embryo is not enclosed in a protective structure at pollination, with the pollen landing directly on the embryo.
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Angiosperms evolved from gymnosperms, their closest relatives are Gnetae. Two key adaptations allowed them to displace gymnosperms as the dominant fauna -- fruits and flowers.
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Transfer of pollen from the anther to the stigma in angiosperms or from the microsporangium to the micropyle in gymnosperms.
Clone bank
See genomic library.
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