Seed Plants (Division Spermatopsida)
Gymnosperms
Fossil from the Devonian period reveal fernlike plants that were heterosporous; that is, produced two kinds of spores.
microspores (male) and
megaspores (female).
seed plant
any plant that bears seeds. Most seed plants, have flowers and produce seeds in fruits; some, such as the pines, form seeds on cones.
segment
a division; a section.
Seed Plants
Fossil range: ???
Welwitschia mirabilis a member of the Gnetophyta
Scientific classification ...
seed plants retain the female gametophyte on the sporophyte
Spores/Pollen
spores for resisting environmental degradation ...
seed plant Common term for gymnosperms and angiosperms.
seed-scale complex The spirally arranged scales on a female strobilus in gymnosperms.
ovule In seed plants, a protective structure in which the female gametophyte develops, fertilization occurs, and seeds develop; contained within the ovary.
ovule -- In seed plants, the structure which gives rise to the seed.
Pollen: The cells that carry the male DNA of a seed plant.
Prion-related protein (PrP): A normal protein, expressed in the nervous system of animals, ...
a characteristic reproductive structure of seed plants that consists of an embryo, enclosed by a seed coat, and a food-storage tissue; see endosperm
Source: Noland, George B. 1983. General Biology, 11th Edition. St. Louis, MO. C. V. Mosby ...
- Cultivar of the rapeseed plant from which rapeseed oil is obtained
Carotenoids ...
(Science: plant biology) A haploid spore produced by a plant sporophyte that develops into a male gametophyte. In seed plants, it corresponds to the developing pollen grain at the uninucleate stage.
[Gk. mikros, small + spora, a sowing]
In plants, a haploid (n) spore that develops into a male gametophyte; in seed plants, it becomes a pollen grain.
microtubule ...
fruit - the developing and mature, ripened ovary of a seed plant, e.g. pea pod, nut, tomato ...
Angiosperms represent approximately 80 percent of all the known green plants now living. The angiosperms are vascular seed plants in which the ovule (egg) is fertilized and develops into a seed in an enclosed...
Full article ...
Double fertilization: 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.
 See also: Plant, Seed, Tissue, Animal, Organ
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