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A seed plant or spermatophyte ( lit. 'seed plant'; from Ancient Greek σπέρματος (spérmatos) 'seed', and φυτόν (phytón) 'plant'), also known as a phanerogam (taxon Phanerogamae) or a phaenogam (taxon Phaenogamae ), is any plant that produces seeds. It is a category of embryophyte (i.e. land plant) that includes most of the ...
seed plant, any of the more than 300,000 species of seed -bearing vascular plants. Although the taxonomic division Spermatophyta is no longer accepted, the term spermatophyte is used to refer collectively to the angiosperms (flowering plants) and gymnosperms ( conifers, cycads, and allies). See also seed. seed fern.
- The Editors of Encyclopaedia Britannica
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Seed plants consist of approximately 1,000 species of non-angiosperms ( gymnosperms) and about 250,000 species of angiosperms. They have a sporic life-cycle with sporophyte predominance, and seeds. The gametophyte is reduced to cells inside the ovule or pollen grain. Males have a minimum number of cells being three and females being four.
The spermatophytes, which means "seed plants", are some of the most important organisms on Earth. Life on land as we know it is shaped largely by the activities of seed plants. Soils, forests, and food are three of the most apparent products of this group. Seed-producing plants are probably the most familiar plants to most people, unlike mosses ...
Spermatocyte. Spermatogenesis as the cells progress from spermatogium, to primary spermatocytes, to secondary spermatocytes, to spermatids and to sperm. Spermatocytes are a type of male gametocyte in animals. They derive from immature germ cells called spermatogonia. They are found in the testis, in a structure known as the seminiferous tubules ...
The sperms (spermatia) come through the pollen tube (like in conifers and gnetophytes). One sperm fertilizes the egg cell, and the other sperm fertilizes the biggest cell of embryo sac (Figure 8.1.1 8.1. 1 ). While the first fertilization results in a “normal” diploid zygote which grows into embryo, the second fertilization ignites the ...
BSC2011C: Principles of Biology 2. Seed plants (Division Spermatophyta) are the most common plants on earth today. In the fossil record, there are examples of now extinct tree ferns that had seeds, indicating seed plants likely originated from ferns. Seedless plants reproduce via spores, which are single-celled zygotes with a tough cell wall.
