| 词汇 | angiosperm |
| 释义 | angiosperm noun[ C ] biology specializeduk /ˈæn.dʒi.əʊˌspɜːm/ us /ˈæn.dʒi.oʊˌspɝːm/ any plant of a group of plants that have flowers and seeds: 被子植物 Angiosperms are the dominant order of flora in the world's ecology.被子植物是世界生态系统中的主要植物类群。 Although yams and potatoes are both angiosperms, that is flowering plants, they are not related botanically. Compare gymnosperm spermatophyte Angiosperms began to diverge from their fern ancestors towards the end of the Jurassic era. A botanist and academic, he did pioneering work in the taxonomy of angiosperms. Angiosperms grow from seeds enclosed in a case, whereas gymnosperms grow from seeds with no protective case. Types of plant acanthus air plant amaranth Andromeda annual emergent evergreen fiddlehead grower gymnosperm mossy mugwort mustard non-hardy non-legume spleenwort starter plug succulent sundew tenderness Examples of angiospermangiosperm The angiosperm species have, in general, narrower ranges than those o f other groups. Mutation rates and dominance levels of genes affecting total fitness in two angiosperm species. This suggests that epiphytes should have a greater opportunity to establish on angiosperm trees than on tree ferns. In seed heterogeneity, described in more than 200 species of angiosperms, single individual plants produce seeds differing in their external appearance. The macroscopic forms of aquatic vegetation denoted as aquatic macrophytes include macroalgae, some species of ferns and angiosperms inhabiting a wetland. Environmental triggers of fertility are discussed and phenological patterns are compared with ferns and angiosperms from other habitats. This contrasts with most other multicellular plant systems, including the angiosperms, where fertilisation occurs deep within the maternal tissue. Changing palaeotemperature and angiosperm development impacts upon the faunas. The great majority of whiteflies in existence today colonize only dicotyledonous angiosperms and a smaller, but significant, number feed on monocots, particularly grasses and palms. The second type of angiosperm wood (less common) is characterized by solitary, diffuse porous vessel arrangement. The isolation of egg cells is difficult in angiosperms because the egg cell is deeply embedded within the ovule. This and other rare angiosperm woods cannot at this stage be identified. Since that time, methods for isolating embryo sacs from various angiosperm species have been reported. Evolution of the angiosperms : calibrating the family tree. We suppose that tree fern trunks of the smallest dbh class may be older than angiosperm trunks of the same dbh. 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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