| 词汇 | gymnosperm |
| 释义 | gymnosperm noun[ C ] biology specializeduk /ˈdʒɪm.nə.spɜːm/ us /ˈdʒɪm.nə.spɝːm/ any plant of a group of plants that produce seeds but no flowers, including conifers and cycads: 裸子植物 Gymnosperms grow only from seeds without the protective case.裸子植物只能从没有保护壳的种子开始生长。 Plant life was mainly primitive gymnosperms, with ferns and conifers dominant. It's a deciduous gymnosperm, originally from China. In gymnosperms, the seeds lie exposed on the cone scales. Only conifers, cycads, ferns, and horsetails today are gymnosperms. Early gymnosperms were abundant during the Carboniferous period. The redwood is a conifer whose ancient lineage connects it to the gymnosperms alive when dinosaurs still roamed our world. Types of plant acanthus air plant amaranth Andromeda angiosperm early emergent evergreen fiddlehead grower mossy mugwort mustard non-hardy non-legume spleenwort starter plug succulent sundew tenderness Compareangiosperm spermatophyte Examples of gymnospermgymnosperm The molecular organic and stable isotopic composition of this material indicated a terrestrial source for the hydrocarbon layer, with evidence of significant contributions from gymnosperms. The landscape then was dominated by mountain streams and deep lakes surrounded by forests of gymnosperm trees. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. The receptive part of the gymnosperm ovule is called the "micropyle". From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Dominant gymnosperm genera were replaced post-boundary by lycophytesextant lycophytes are recolonizers of disturbed areas. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. It is found in both gymnosperm and angiosperm plants. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. And some of the gymnosperm families have been revised. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. The gymnosperm vegetative meristem lacks organization into distinct tunica and corpus layers. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. The former, a plant pathogen, causes leafy gall disease in both angiosperm and gymnosperm plants. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. The gymnosperm trees include conifers, cycads, ginkgophytes and gnetales. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. The foliage of this tropical angiosperm tree looks like that of gymnosperm pine trees which typically grow in temperate climates. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. More than one embryo is usually initiated in each gymnosperm seed. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Polypores are often restricted to either deciduous (angiosperm) or conifer (gymnosperm) host trees. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Since its seeds are not protected by an ovary wall, it can morphologically be considered a gymnosperm. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. The life cycle of a gymnosperm is similar. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. The most common example of germination is the sprouting of a seedling from a seed of an angiosperm or gymnosperm. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. These examples are from corpora and from sources on the web. Any opinions in the examples do not represent the opinion of the Cambridge Dictionary editors or of Cambridge University Press or its licensors. |
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