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.
GYMNOSPERMS - FIRST PLANTS WITH SEEDS
So you've got a vascular system. What comes next? Seeds. Seeds let you send your offspring out into the world.
gymnosperm -- n. A plant that produces seeds, which are not enclosed; includes any seed plant that does not produce flowers.
Gymnosperms
Fossil from the Devonian period reveal fernlike plants that were heterosporous; that is, produced two kinds of spores.
microspores (male) and
megaspores (female).
gymnosperms Flowerless, seed-bearing land plants; the ?rst seed plants; living groups include the pines, ginkgos, and cycads. Naked seeds.
gymnosperm
(jim-noh-spurm) [Gk. gymnos, naked + sperma, seed]
A vascular plant that bears naked seeds not enclosed in any specialized chambers.
gymnosperm
A vascular plant that bears naked seeds not enclosed in any specialized chambers.
gynoecium
The female reproductive organs of a flower, consisting of one or more carpels.
[edit] Gymnosperm stems
All gymnosperms are woody plants. Their stems are similar in structure to woody dicots except that most gymnosperms produce only tracheids in their xylem, not the vessels found in dicots.
Gymnosperms have seeds but not fruits or flowers. Gymnos means naked, sperm means seed: thus the term gymnosperm = naked seeds.
Gymnosperms
Gyrase
(Date:3/28/2011)... have completed the first human randomized controlled trial ... uses a catheter-based probe inserted into the renal ... nerves near the kidneys (or in the renal ...
gymnosperm Seed-producing plants in which the seed is not enclosed in an ovary as in angiospems. Ginkgos, cycads, and conifers are examples.
The gymnosperms and angiosperms have stems above ground and roots below. The stems can grow thicker and taller each year and therefore they can reach great heights. Both groups have seeds which are dormant embryos released by the parent plant.
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) ...
Angiosperms evolved from gymnosperms, their closest relatives are Gnetae. Two key adaptations allowed them to displace gymnosperms as the dominant fauna -- fruits and flowers.
A Class of the Gymnospermae which includes needle-leaved trees such as pines and cypresses. Their flowers are in cones, and male and flower cones are separate.
woody, usually tall, perennial higher plants (angiosperms, gymnosperms, and some pterophyta) having usually a main stem and numerous branches.
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Pollination
Transfer of pollen from the anther to the stigma in angiosperms or from the microsporangium to the micropyle in gymnosperms.
Cf. autogamy.
Related Terms:
Pollination
Transfer of pollen from the anther to the stigma in angiosperms or from the microsporangium to the micropyle in gymnosperms.
By the Carboniferous Period, about 355 million years ago, most of the Earth was covered by forests of primitive vascular plants, such as lycopods (scale trees) and gymnosperms (pine trees, ginkgos).
 See also: Plant, Species, Gymnosperms, Organ, Angiosperm
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