| 单词 | seed plant |
| 例句 | Were those naive villagers collecting every type of seed plant that they found, bringing it home, poisoning themselves on most of the species, and nourishing themselves from only a few species? Guns, Germs, and Steel: The Fates of Human Societies 1997-03-01T00:00:00Z Instead, they evidently knew the local wild plants as intimately as do modern New Guineans, and they used that knowledge to select and bring home only the most useful available seed plants. Guns, Germs, and Steel: The Fates of Human Societies 1997-03-01T00:00:00Z Aboriginal Australians who never reached the stage of farming yams and seed plants nonetheless anticipated several elements of farming. Guns, Germs, and Steel: The Fates of Human Societies 1997-03-01T00:00:00Z They managed the landscape by burning it, to encourage the growth of edible seed plants that sprout after fires. Guns, Germs, and Steel: The Fates of Human Societies 1997-03-01T00:00:00Z The seed plants, or spermatophytes, form the largest group of all existing plants, and hence dominate the landscape. Fundamentals of Biology 2015-01-01T00:00:00Z Heterospory is observed in a few seedless vascular plants and in all seed plants. Concepts of Biology 2013-04-25T00:00:00Z In the spring and fall, it is released from seed plants, and flies through the wind to fertilize other plants. Why are allergies so bad this spring? 2023-04-27T04:00:00Z Despite ferns' unique physiology and their relationship to seed plants, however, these strange genomes have been largely neglected by researchers. Strange Tree Fern Has a Surprisingly Enormous Genome 2022-09-23T04:00:00Z Their roles in the fern are unclear, but seven of these genes are active in leaves where spores are produced, suggesting they play a role in reproduction in ferns as well as in seed plants. Genes for seeds arose early in plant evolution, ferns reveal 2022-09-22T04:00:00Z Vascular plants are divided into seedless and seed plants. Fundamentals of Biology 2015-01-01T00:00:00Z The spores of seedless plants and the pollen of seed plants are surrounded by thick cell walls containing a tough polymer known as sporopollenin. Concepts of Biology 2013-04-25T00:00:00Z The roots of seed plants have three major functions: anchoring the plant to the soil, absorbing water and minerals and transporting them upwards, and storing the products of photosynthesis. Biology for AP Courses 2022-06-09T00:00:00Z This species might be hoarding chromosomes, Li says: “I call this the Marie Kondo hypothesis. The chromosomes spark joy for ferns, but they don't spark joy for seed plants.” Strange Tree Fern Has a Surprisingly Enormous Genome 2022-09-23T04:00:00Z Its DNA contains genes for transcription factors called EMS1 and TPD1, proteins that in maize and other seed plants regulate genes involved in pollen development, Yan’s team reported in the same issue of Nature Plants. Genes for seeds arose early in plant evolution, ferns reveal 2022-09-22T04:00:00Z For millennia, human societies have depended on seed plants for nutrition and medicinal compounds: and more recently, for industrial by-products, such as timber and paper, dyes, and textiles. Fundamentals of Biology 2015-01-01T00:00:00Z Fossils place the earliest distinct seed plants at about 350 million years ago. Concepts of Biology 2013-04-25T00:00:00Z In seed plants, such as magnolia trees and daisies, the gametophyte is composed of only a few cells and, in the case of the female gametophyte, is completely retained within the sporophyte. Biology for AP Courses 2022-06-09T00:00:00Z Adaptations that allow seed plants to reproduce without standing water include a reproductive process that takes place in cones or flowers, the transfer of sperm by pollination, and the protection of embryos in seeds. Miller & Levine Biology 2018-01-01T00:00:00Z The cycad genome contains similar networks, showing they were active in the earliest seed plants, notes Shouzhou Zhang, the botanist at the Fairy Lake Botanical Garden in Shenzan, who led its sequencing. Genes for seeds arose early in plant evolution, ferns reveal 2022-09-22T04:00:00Z With such evolutionary advantages, seed plants have become the most successful and familiar group of plants, in part because of their size and striking appearance. Fundamentals of Biology 2015-01-01T00:00:00Z The two innovative structures of pollen and seed allowed seed plants to break their dependence on water for reproduction and development of the embryo, and to conquer dry land. Concepts of Biology 2013-04-25T00:00:00Z Earth’s seed plants are disappearing 500 times faster than they would without human influence. Daily briefing: Fertilize oceans or seed clouds? No one knows 2019-06-10T04:00:00Z In seed plants, male and female gametophytes grow and mature directly within the sporophyte inside cones or flowers. Miller & Levine Biology 2018-01-01T00:00:00Z “The major innovations in the seed plants were taking place in drier environments.” Dead Sea fossils hint at earlier start for some ancient plants 2018-12-19T05:00:00Z The fossil plant Elkinsia polymorpha, a “seed fern” from the Devonian period—about 400 million years ago—is considered the earliest seed plant known to date. Fundamentals of Biology 2015-01-01T00:00:00Z In both seedless and seed plants, the female gametophyte provides nutrition, and in seed plants, the embryo is also protected as it develops into the new generation of sporophyte. Concepts of Biology 2013-04-25T00:00:00Z In angiosperms and other seed plants, that gametophyte phase is still there, but is neatly bundled away inside organs on the sporophyte, and the sporophyte phase is the only bit you ever see externally. Spore heroes: unlocking the life-cycle secrets of the earliest land plants 2018-05-24T04:00:00Z The entire male gametophyte of a seed plant is found in a pollen grain. Miller & Levine Biology 2018-01-01T00:00:00Z There's also Brian Atkinson, a postdoctoral researcher at the University of Kansas who focuses on seed plants from the Cretaceous period, which is after the Permian. Five New Fossil Forests Found in Antarctica 2018-03-16T04:00:00Z This gave a reproductive edge to seed plants, which are better adapted to survive dry spells. Fundamentals of Biology 2015-01-01T00:00:00Z With such evolutionary advantages, seed plants have become the most successful and familiar group of plants. Concepts of Biology 2013-04-25T00:00:00Z Ackerly, D. D. & Reich, P. B. Convergence and correlations among leaf size and function in seed plants: a comparative test using independent contrasts. Evolutionary history resolves global organization of root functional traits 2018-02-20T05:00:00Z In an experiment published in the scientific journal, Nature, earlier this year, Cutler’s team used the re-engineered protein in tomato plants and Arabidopsis, a relative of the mustard seed plant. BrandVoice: How One Scientist Is Helping Plants Survive California's Worst Drought 2015-03-30T04:00:00Z Mammals, including humans, were more sensitive to radioactivity than insects, seed plants, or bacteria. We tried to weaponize the weather 2013-04-27T19:00:00Z While seed plants developed adaptations that allowed them to populate even the most arid habitats on Earth, full independence from water did not happen in all plants. Fundamentals of Biology 2015-01-01T00:00:00Z Heterosporous seedless plants are seen as the evolutionary forerunners of seed plants. Concepts of Biology 2013-04-25T00:00:00Z Those plants date back to the Mesozoic “age of the dinosaurs” and form the base of the evolutionary tree of seed plants. Green Blog: The Tree of Life Gets a Makeover 2011-12-19T21:11:21Z The other took place about 320 million years ago in the ancestor of seed plants, the researchers report online today in Nature. Double the Genes, Double the Flora 2011-04-10T18:00:00Z Ferns are growing about everywhere, though they are not exactly our ferns, but are rather a sort of intermediate form between these and the present seed plants. The Meaning of Evolution Heterospory is observed in a few seedless vascular plants and in all seed plants. Fundamentals of Biology 2015-01-01T00:00:00Z The seed plants form the largest group of all existing plants and, hence, dominate the landscape. Concepts of Biology 2013-04-25T00:00:00Z For example, gnetophytes, a group that consists of shrubs and woody vines, are the most primitive non-flowering seed plants, according to the researchers’ analysis. Green Blog: The Tree of Life Gets a Makeover 2011-12-19T21:11:21Z The seed plants are there selected in June, at the time of heading, and allowed to stand until the seed matures. The Cauliflower The seed plants should be left standing some six or eight weeks after the other plants have been harvested. Tobacco; Its History, Varieties, Culture, Manufacture and Commerce They are considered the most advanced seedless vascular plants and display characteristics commonly observed in seed plants. Fundamentals of Biology 2015-01-01T00:00:00Z Its fan-shaped leaves, unique among seed plants because they feature a dichotomous venation pattern, turn yellow in autumn and fall from the plant. Concepts of Biology 2013-04-25T00:00:00Z Researchers mapped evolutionary relationships among families of seed plants. Green Blog: The Tree of Life Gets a Makeover 2011-12-19T21:11:21Z In the selection of plants from which to get seed, you must know what kind of plants are really the best seed plants. Agriculture for Beginners Revised Edition The last and highest great division of the vegetable kingdom has been named Spermaphyta, “seed plants,” from the fact that the structures known as seeds are peculiar to them. Elements of Structural and Systematic Botany For High Schools and Elementary College Courses What makes them the first true seed plants is that they developed structures called cupules to enclose and protect the ovule—the female gametophyte and associated tissues—which develops into a seed upon fertilization. Fundamentals of Biology 2015-01-01T00:00:00Z Gymnosperms are heterosporous seed plants that produce naked seeds. Concepts of Biology 2013-04-25T00:00:00Z It is also fertile in the same products, although less abundantly than Calamian the great, but it is so overrun with rats or moles that no seed plant can live, for they destroy everything. The Philippine Islands, 1493-1898 — Volume 21 of 55 1624 Explorations by early navigators, descriptions of the islands and their peoples, their history and records of the catholic missions, as related in contemporaneous books and manuscripts, showing the political, economic, commercial and religious conditions of those islands from their earliest relations with European nations to the close of the nineteenth century. Do not use it merely as a seed plant, but carefully plant its seeds apart and tend carefully. Agriculture for Beginners Revised Edition In the full-grown ovule the macrospore, which in the seed plants is generally known as the “embryo sac,” is completely filled with the prothallium or “endosperm.” Elements of Structural and Systematic Botany For High Schools and Elementary College Courses Two major innovations—seed and pollen—allowed seed plants to reproduce in the absence of water. Fundamentals of Biology 2015-01-01T00:00:00Z Near the villages were ornamental lines of chilies and beans and seed plants for oil, with occasional clusters of kowliang, fully twelve and thirteen feet high. Korea's Fight for Freedom As the plant was not a native of our country, but was brought from the West Indies, it became necessary either to import more seed plants, or to raise some other staple. A School History of the United States Cuttings usually give best results in the Northern states, as the seasons are not long enough for seed plants to give good bloom. Manual of Gardening (Second Edition) No spermatozoids are produced, the seed plants differing in this respect from all pteridophytes. Elements of Structural and Systematic Botany For High Schools and Elementary College Courses The gametophytes of seed plants shrank, while the sporophytes became prominent structures and the diploid stage became the longest phase of the lifecycle. Fundamentals of Biology 2015-01-01T00:00:00Z From this seed plants of a wholly different type came the next year, of smaller stature, and with more brownish and rounded kernels. Species and Varieties, Their Origin by Mutation Fibers of seed plants such as cotton, flax, and hemp are woven into cloth. Fundamentals of Biology 2015-01-01T00:00:00Z Lastly, it is more difficult to quantify the benefits of ornamental seed plants. Fundamentals of Biology 2015-01-01T00:00:00Z In the seed plants the macrosporangia remain attached to the parent plant, in nearly all cases, until the archegonia are fertilized and the embryo plant formed. Elements of Structural and Systematic Botany For High Schools and Elementary College Courses Staple crops are not the only food derived from seed plants. Fundamentals of Biology 2015-01-01T00:00:00Z Because ecosystems are in a delicate balance, and seed plants maintain close symbiotic relationships with animals—whether predators or pollinators—the disappearance of a single plant can lead to the extinction of connected animal species. Fundamentals of Biology 2015-01-01T00:00:00Z In both seedless and seed plants, the female gametophyte provides protection and nutrients to the embryo as it develops into the new generation of sporophyte. Fundamentals of Biology 2015-01-01T00:00:00Z In seed plants, which use pollen to transfer the male sperm to the female egg, the toughness of sporopollenin explains the existence of well-preserved pollen fossils. Fundamentals of Biology 2015-01-01T00:00:00Z This type of bundle, called “collateral,” is the common form found in the stems and leaves of seed plants. Elements of Structural and Systematic Botany For High Schools and Elementary College Courses Additionally, no discussion of seed plant contribution to human diet would be complete without the mention of alcohol. Fundamentals of Biology 2015-01-01T00:00:00Z Its fan-shaped leaves—unique among seed plants because they feature a dichotomous venation pattern—turn yellow in autumn and fall from the tree. Fundamentals of Biology 2015-01-01T00:00:00Z Gametangia are prominent in seedless plants, but are very rarely found in seed plants. Fundamentals of Biology 2015-01-01T00:00:00Z Fossils indicate that by the end of the Devonian period, ferns, horsetails, and seed plants populated the landscape, giving rising to trees and forests. Fundamentals of Biology 2015-01-01T00:00:00Z Many societies eat almost exclusively vegetarian fare and depend solely on seed plants for their nutritional needs. Fundamentals of Biology 2015-01-01T00:00:00Z |
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