| 单词 | angiosperm |
| 例句 | Edward collected the state’s angiosperms and gymnosperms in an herbarium, and Orra drew and painted them. Mushrooms, Magma and Love in a Time of Science 2018-07-26T04:00:00Z It may have helped them weather the dramatic shift in climate or it may have allowed them to compete better with the faster-growing angiosperm plants that flourished after the extinction, "or it could be both." Plants that survived dinosaur extinction pulled nitrogen from air 2023-11-16T05:00:00Z Seed plants are in the Spermatophyte group and consist of gymnosperms and angiosperms. Fundamentals of Biology 2015-01-01T00:00:00Z Modern angiosperms appear to be a monophyletic group, which means that they originate from a single ancestor. Concepts of Biology 2013-04-25T00:00:00Z The mass extinction event reduced the number of ferns and angiosperms. Biology for AP Courses 2022-06-09T00:00:00Z As angiosperm seeds mature, ovary walls thicken to form a fruit that encloses the developing seeds. Miller & Levine Biology 2018-01-01T00:00:00Z "Generally, it is well known from the fossil record that angiosperms started to evolve large, fleshy fruit during this time, and palms simply followed the same pattern," Onstein told Salon. When dinosaurs died, Earth's plants were left with big shoes to fill 2022-05-03T04:00:00Z The lifecycle of bryophytes and pterophytes is characterized by the alternation of generations, like gymnosperms and angiosperms; what sets bryophytes and pterophytes apart from gymnosperms and angiosperms is their reproductive requirement for water. Fundamentals of Biology 2015-01-01T00:00:00Z Basal angiosperms are a group of plants that are believed to have branched off before the separation into monocots and eudicots because they exhibit traits from both groups. Concepts of Biology 2013-04-25T00:00:00Z Based on their reduced pollen counts found in the samples, the mass extinction event clearly reduced the number of ferns and angiosperms. Biology for AP Courses 2022-06-09T00:00:00Z But the angiosperm seed, protected by a fruit, was an even better adaptation. Miller & Levine Biology 2018-01-01T00:00:00Z "We therefore challenge the previous assumption that dinosaurs and angiosperms did not really influence each other's evolution and ecology, as was previously thought," Onstein explained. When dinosaurs died, Earth's plants were left with big shoes to fill 2022-05-03T04:00:00Z New data in comparative genomics and paleobotany have, however, shed some light on the evolution of angiosperms. Fundamentals of Biology 2015-01-01T00:00:00Z Like angiosperms, but unlike other gymnosperms, all gnetophytes possess vessel elements in their xylem. Concepts of Biology 2013-04-25T00:00:00Z Ferns, having a selective advantage of being early colonizers, grew fast on poor soil and reproduced rapidly, thus replaced angiosperms in the landscape. Biology for AP Courses 2022-06-09T00:00:00Z Once fertilization of an angiosperm is complete, nutrients flow from the vascular system into the flower to support the growing embryo within the seed. Miller & Levine Biology 2018-01-01T00:00:00Z The team found that, as with the outer seed coat in modern angiosperm seeds, the cupule tissue curved around the developing seeds. Exquisite fossils unearthed in Inner Mongolia reveal how peas got their hard coat 2021-05-26T04:00:00Z The most primitive living angiosperm is considered to be Amborella trichopoda, a small plant native to the rainforest of New Caledonia, an island in the South Pacific. Fundamentals of Biology 2015-01-01T00:00:00Z Basal angiosperms belong to a lineage older than monocots and eudicots. Concepts of Biology 2013-04-25T00:00:00Z Students are sorting fossils of angiosperm pollen grains, some recovered from layers below the Cretaceous- Paleogene boundary and some from layers above the Cretaceous-Paleogene boundaries. Biology for AP Courses 2022-06-09T00:00:00Z The mystery centres on the rise of the flowering plants, or angiosperms, the family of plants that produce flowers and bear their seeds in fruits. New light shed on Charles Darwin's 'abominable mystery' 2021-01-22T05:00:00Z Now, thanks to cutting-edge technology and a chance find in the Inner Mongolian countryside, researchers have taken a big step toward understanding how flowering plants, or angiosperms, came to be. Exquisite fossils unearthed in Inner Mongolia reveal how peas got their hard coat 2021-05-26T04:00:00Z Analysis of the genome of A. trichopoda has shown that it is related to all existing flowering plants and belongs to the oldest confirmed branch of the angiosperm family tree. Fundamentals of Biology 2015-01-01T00:00:00Z Gnetophyta are considered the closest group to angiosperms because they produce true xylem tissue that contains both tracheids and vessel elements. Concepts of Biology 2013-04-25T00:00:00Z Students are sketching diagrams of the reproductive system of angiosperms for a plant anatomy class. Biology for AP Courses 2022-06-09T00:00:00Z "Why isn't there a gradual evolution of the angiosperms? Why can't we see intermediate forms between the gymnosperms - things like conifers - and the flowering plants? And why, when they appear, are they already so diverse?" New light shed on Charles Darwin's 'abominable mystery' 2021-01-22T05:00:00Z But angiosperms evolved some key innovations for seed production that likely enabled their success. Exquisite fossils unearthed in Inner Mongolia reveal how peas got their hard coat 2021-05-26T04:00:00Z A few other angiosperm groups called basal angiosperms, are viewed as primitive because they branched off early from the phylogenetic tree. Fundamentals of Biology 2015-01-01T00:00:00Z The wood of conifers is more primitive than the wood of angiosperms; it contains tracheids, but no vessel elements, and is referred to as “soft wood.” Concepts of Biology 2013-04-25T00:00:00Z Both share the genus cannabis in the plant family cannabaceae among the major group angiosperms or flowering plants. Kentucky editorial roundup 2019-09-11T04:00:00Z The baobab “is famous because it is the biggest angiosperm, and it is the most iconic tree of Africa,” Patrut said. Africa’s most famous trees are dying, and scientists suspect a changing climate 2018-06-11T04:00:00Z They called the outer coat a cupule and proposed that it was the precursor to the outer coat, or integument, of angiosperm seeds. Exquisite fossils unearthed in Inner Mongolia reveal how peas got their hard coat 2021-05-26T04:00:00Z Most modern angiosperms are classified as either monocots or eudicots, based on the structure of their leaves and embryos. Fundamentals of Biology 2015-01-01T00:00:00Z What are the two structures that allow angiosperms to be the dominant form of plant life in most terrestrial ecosystems? Concepts of Biology 2013-04-25T00:00:00Z The team estimates that the tree was 2,450 years old, making it the oldest known accurately dated African baobab and angiosperm. Africa’s majestic baobab trees are mysteriously dying 2018-06-11T04:00:00Z The researchers say genome-downsizing happened only in the angiosperms, and this was ''a necessary prerequisite for rapid growth rates among land plants''. How flowering plants conquered the world 2018-01-13T05:00:00Z Until now, researchers had focused on a fossil cupule plant called Caytonia, discovered in Yorkshire, U.K., as the closest relative to angiosperms. Exquisite fossils unearthed in Inner Mongolia reveal how peas got their hard coat 2021-05-26T04:00:00Z Basal angiosperms, such as water lilies, are considered more primitive because they share morphological traits with both monocots and eudicots. Fundamentals of Biology 2015-01-01T00:00:00Z Double fertilization is an event unique to angiosperms. Concepts of Biology 2013-04-25T00:00:00Z Comparisons between related angiosperms ancestors whittled away at the database until they arrived at the first ancestral flower. The Hunt for the First Flower 2017-09-02T04:00:00Z Before now, we didn’t understand much about the origin of most of today’s flowering plants, called angiosperms. The earliest flower ancestor had both male and female parts 2017-08-01T04:00:00Z Most of the trees that shifted west were angiosperms, or flowering trees. Trees in eastern US head west as climate changes 2017-05-16T04:00:00Z In some cases, prior results from morphological studies have been confirmed: for example, confirming Amborella trichopoda as the most primitive angiosperm known. Fundamentals of Biology 2015-01-01T00:00:00Z By promoting the reproduction of angiosperms, or flowering plants, bees are also central to the survival of countless other animal species that rely on those plants and their fruits to survive. “The bees are trying to tell us something”: We may want to listen to the animal our survival depends on 2015-10-06T04:00:00Z But because it contains seeds enclosed in a fruit, the basic characteristic of angiosperms, it is classified as a flowering plant. Ancient Aquatic Flora Was Among the First Flowering Plants 2015-08-18T04:00:00Z And another “first flower” contender—also an aquatic angiosperm—arose in China 125 million years ago, as Dilcher and his colleagues described in 1998. World’s first flowers may have come from fresh water 2015-08-17T04:00:00Z Because evolutionary pressures on primary and specialized metabolism differ, we investigated differences in the emergence and maintenance of these processes across 16 species encompassing major plant lineages from algae to angiosperms. [Report] Genomic Signatures of Specialized Metabolism in Plants 2014-05-01T18:26:38.354Z Illustration shows the life cycle of angiosperms, which includes a microgametophyte stage and a megagametophyte stage. Fundamentals of Biology 2015-01-01T00:00:00Z Flowering plants - also known as angiosperms - are the most numerous and diverse group of seed-producing plants on land. Earlier origin for flowering plants 2013-10-01T19:40:40Z Montsechia places the Ceratophyllumlineage as one of the oldest of all the flowering plants and suggests that we need to reevaluate the nature of the evolution of the original angiosperm again. Ancient Aquatic Flora Was Among the First Flowering Plants 2015-08-18T04:00:00Z Finding more fossils of aquatic flowering plants and placing those fossils in the family tree “will tell us whether the first angiosperms were aquatic or terrestrial.” World’s first flowers may have come from fresh water 2015-08-17T04:00:00Z We therefore manually identified P. abies loci homologous to genes known to be centrally involved in these processes in angiosperms. The Norway spruce genome sequence and conifer genome evolution 2013-05-29T17:21:22.577Z The evolution of plants has resulted in widely varying levels of complexity, from the earliest algal mats, to bryophytes, lycopods, and ferns, to the complex gymnosperms and angiosperms of today. Fundamentals of Biology 2015-01-01T00:00:00Z "With a few differences... the pollen from the Middle Triassic look exactly the same as the angiosperm pollen from the Early Cretaceous," explained Prof Hochuli. Earlier origin for flowering plants 2013-10-01T19:40:40Z The leaves of angiosperm trees vary wildly in size, but the range of size narrows among taller trees. Simple Physics May Limit the Size of Leaves 2013-01-04T17:10:00Z "The paper offers fresh evidence that early angiosperms invaded freshwater aquatic habitats," agrees Taylor Feild, a botanist at James Cook University in Townsville, Australia. World’s first flowers may have come from fresh water 2015-08-17T04:00:00Z MADS-box genes are involved in controlling most aspects of angiosperm development. The Norway spruce genome sequence and conifer genome evolution 2013-05-29T17:21:22.577Z That algal line evolved into the Charophytes, and eventually into the modern mosses, ferns, gymnosperms, and angiosperms. Fundamentals of Biology 2015-01-01T00:00:00Z Overall, flowering plants—the angiosperms—were at greater risk than pine trees and their relatives—the gymnosperms. Trees Living on the Edge 2012-11-21T18:00:00Z And as tree height increases, the two limits converge and cross at roughly 100 meters: the height of the tallest angiosperms. Simple Physics May Limit the Size of Leaves 2013-01-04T17:10:00Z If the close connection to Montsechia is true, then the foxtails would be 10 million years older than previously thought, he says, placing them closer to the time when angiosperms originated. World’s first flowers may have come from fresh water 2015-08-17T04:00:00Z Two major differences between angiosperms and gymnosperms are their contrasting reproductive development and the development of water-conducting xylem cells. The Norway spruce genome sequence and conifer genome evolution 2013-05-29T17:21:22.577Z Fossilized pollen recovered from Jurassic geological material has been attributed to angiosperms. Fundamentals of Biology 2015-01-01T00:00:00Z This supports previous findings that the tomato genome is unusual among angiosperms by being largely comprised of low-copy DNA. The tomato genome sequence provides insights into fleshy fruit evolution 2012-05-30T17:51:43.433Z The range narrows as tree height increases, with the tallest angiosperms all sprouting leaves that are 10 to 20 centimeters long. Simple Physics May Limit the Size of Leaves 2013-01-04T17:10:00Z In addition, other ancient aquatic angiosperms arose independently around the same time as Montsechia. World’s first flowers may have come from fresh water 2015-08-17T04:00:00Z The oak, apple, beech, etc., are angiosperms, while the pines, spruce, hemlock, and the allied varieties, are gymnosperms. Webster's Unabridged Dictionary 2012-03-24T02:00:23.513Z A few early Cretaceous rocks show clear imprints of leaves resembling angiosperm leaves. Fundamentals of Biology 2015-01-01T00:00:00Z Solanum is one of the largest angiosperm genera and includes annual and perennial plants from diverse habitats. The tomato genome sequence provides insights into fleshy fruit evolution 2012-05-30T17:51:43.433Z Jensen and Zwieniecki considered only flowering plants, or angiosperms, such as maples and oaks, but not gymnosperms, such as pines and redwoods. Simple Physics May Limit the Size of Leaves 2013-01-04T17:10:00Z In terms of the apparent expansion and divergence of NACHT-encoding genes, the coral resembles amphioxus, the sea urchin and angiosperms. Using the Acropora digitifera genome to understand coral responses to environmental change 2011-08-17T17:22:15.917Z The endosperm formed in the embryo-sac of angiosperms after fertilization, and found previous to it in gymnosperms, consists of cells containing nitrogenous and starchy or fatty matter, destined for the nutriment of the embryo. Encyclopaedia Britannica, 11th Edition, Volume 11, Slice 3 "Frost" to "Fyzabad" 2011-08-15T02:00:28.473Z Paleobotanists debate whether angiosperms evolved from small woody bushes, or were basal angiosperms related to tropical grasses. Fundamentals of Biology 2015-01-01T00:00:00Z As the first genome sequence of an asterid, the potato genome reveals 2,642 genes specific to this large angiosperm clade. Genome sequence and analysis of the tuber crop potato 2011-07-13T17:21:42.673Z A leaf of an angiosperm produces a sugary sap that flows into a network of pipelike cells called the phloem, which transports the sap down the tree's trunk and through the roots. Simple Physics May Limit the Size of Leaves 2013-01-04T17:10:00Z In angiosperms when the pollen-tube reaches the micropyle it passes down into the canal, and this portion of it increases considerably in size. Encyclopaedia Britannica, 11th Edition, Volume 10, Slice 5 "Fleury, Claude" to "Foraker" 2011-04-03T02:00:20.883Z Thus, the acquisition of sophisticated metabolic controls of stomatal function occurred after lineages for modern ferns and angiosperms diverged many millions of years ago. This Week in Science 2011-02-03T19:25:00.683Z Both views draw support from cladistics studies, and the so-called woody magnoliid hypothesis—which proposes that the early ancestors of angiosperms were shrubs—also offers molecular biological evidence. Fundamentals of Biology 2015-01-01T00:00:00Z The former are angiosperms, and constitute the principal part of the species; the latter are gymnosperms, and chiefly consist of the Conifer� and Cycadace�. The New Gresham Encyclopedia. Vol. 1 Part 2 Amiel to Atrauli The theory could be further tested by seeing if the pattern of leaf sizes is the same for different families within the angiosperm group, he says. Simple Physics May Limit the Size of Leaves 2013-01-04T17:10:00Z Gradually, however, they took a subordinate place, and by the close of the Cretaceous period the angiosperms had gained the upper hand. Encyclopaedia Britannica, 11th Edition, Volume 7, Slice 6 "Coucy-le-Château" to "Crocodile" I neither care to know or tell whether the shrubs and trees in my evergreen pictures are angiosperms or gymnosperms; we have no 'transportation' for text books for students! The Continental Monthly, Vol. 4, No. 2, August, 1863 Devoted to Literature and National Policy The success of angiosperms is due to two novel reproductive structures: flowers and fruit. Fundamentals of Biology 2015-01-01T00:00:00Z In Palæozoic strata the entire want of plants of the most complex organisation is very striking, for not a single dicotyledonous angiosperm has yet been found, and only one undoubted monocotyledon. The World's Greatest Books — Volume 15 — Science Their flowers are rather more highly differentiated than those of the other gymnosperms, and are said to show some approach in structure to those of the angiosperms. Elements of Structural and Systematic Botany For High Schools and Elementary College Courses The earliest of these fossil angiosperms is not in a true sense a primitive form, and no records of such types have yet been discovered. Encyclopaedia Britannica, 11th Edition, Volume 7, Slice 6 "Coucy-le-Château" to "Crocodile" The most advanced type of fertilization is that of angiosperms. Scientific American Supplement, No. 531, March 6, 1886 This difference in the number of embryonic leaves is the basis for the two major groups of angiosperms: the monocots and the eudicots. Fundamentals of Biology 2015-01-01T00:00:00Z The only phaenogamous plants were constitute any feature in the coal are the coniferae; monocotyledonous angiosperms appear to have been very rare, and the dicotyledonous, with one or two doubtful exceptions, were wanting. The Student's Elements of Geology The angiosperms include an enormous assemblage of plants, all those ordinarily called “flowering plants” belonging here. Elements of Structural and Systematic Botany For High Schools and Elementary College Courses But the gap between this and the structural complexity and diversity of angiosperms is enormous. Darwin and Modern Science Watch this video to see an animation of the double fertilization process of angiosperms. Fundamentals of Biology 2015-01-01T00:00:00Z Gnetophyta are considered the closest group to angiosperms because they produce true xylem tissue. Fundamentals of Biology 2015-01-01T00:00:00Z There can at least be no doubt as to the high grade of its organisation, and that it belongs to the monocotyledonous angiosperms. The Student's Elements of Geology The structure of the embryo sac and ovules is quite constant among the angiosperms, the differences being mainly in the shape of the ovules, and the degree to which its coverings or integuments are developed. Elements of Structural and Systematic Botany For High Schools and Elementary College Courses More than 80 percent of angiosperms depend on animals for pollination: the transfer of pollen from the anther to the stigma. Fundamentals of Biology 2015-01-01T00:00:00Z In angiosperms, the female gametophyte exists in an enclosed structure—the ovule—which is within the ovary; in gymnosperms, the female gametophyte is present on exposed bracts of the female cone. Fundamentals of Biology 2015-01-01T00:00:00Z The wood of conifers is more primitive than the wood of angiosperms; it contains tracheids, but no vessel elements, and is therefore referred to as “soft wood.” Fundamentals of Biology 2015-01-01T00:00:00Z The angiosperms seem, therefore, to have been at the least comparatively rare in these older secondary periods, when more space was occupied by the Cycads and Conifers. The Student's Elements of Geology The pollen spores of many angiosperms will germinate very easily in a solution of common sugar in water: about fifteen per cent of sugar is the best. Elements of Structural and Systematic Botany For High Schools and Elementary College Courses Double fertilization is a key event in the lifecycle of angiosperms, but is completely absent in gymnosperms. Fundamentals of Biology 2015-01-01T00:00:00Z The diploid sporophyte of angiosperms and gymnosperms is the conspicuous and long-lived stage of the life cycle. Fundamentals of Biology 2015-01-01T00:00:00Z All angiosperms have seeds that are covered or protected: this feature separates them from the ‘naked seeds’ of gymnosperms. Fundamentals of Biology 2015-01-01T00:00:00Z Illustration depicts the embryo sac of an angiosperm, which is egg-shaped. Fundamentals of Biology 2015-01-01T00:00:00Z The effect of fertilization extends beyond the ovule, the ovary and often other parts of the flower being affected, enlarging and often becoming bright-colored and juicy, forming the various fruits of the angiosperms. Elements of Structural and Systematic Botany For High Schools and Elementary College Courses These are named respectively “gymnosperms” and “angiosperms,” and to the first our plant belongs. Elements of Structural and Systematic Botany For High Schools and Elementary College Courses The breathing pores are much larger than any we have yet seen, and are of the type common to most angiosperms. Elements of Structural and Systematic Botany For High Schools and Elementary College Courses The male and female gametophyte structures are present on separate male and female cones in gymnosperms, whereas in angiosperms, they are a part of the flower. Fundamentals of Biology 2015-01-01T00:00:00Z The shepherd’s-purse is an admirable plant for the study of the development of the flower which is much the same in other angiosperms. Elements of Structural and Systematic Botany For High Schools and Elementary College Courses The second sub-class of the angiosperms, the dicotyledons, receive their name from the two opposite seed leaves or cotyledons with which the young plant is furnished. Elements of Structural and Systematic Botany For High Schools and Elementary College Courses In the latter family, which is by far the largest of all the angiosperms, including about ten thousand species, the differentiation is carried still further. Elements of Structural and Systematic Botany For High Schools and Elementary College Courses |
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