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单词 gymnosperm
释义
gymnosperm
noun[C]
biologyspecialized
uk/ˈdʒɪm.nə.spɜːm/us/ˈdʒɪm.nə.spɝːm/
anyplantof agroupofplantsthatproduceseedsbut noflowers,includingconifersandcycads:
Gymnospermsgrowonly fromseedswithout theprotectivecase.
Plantlifewasmainlyprimitivegymnosperms, withfernsandconifersdominant.
It's adeciduousgymnosperm,originallyfromChina.
More examples
  • In gymnosperms, theseedslieexposedon theconescales.
  • Onlyconifers, cycads,ferns, and horsetails today are gymnosperms.
  • Early gymnosperms wereabundantduring theCarboniferousperiod.
  • Theredwoodis aconiferwhoseancientlineageconnectsit to the gymnospermsalivewhendinosaursstillroamedourworld.
SMART Vocabulary: related words and phrases
Types of plant
  • amaranth
  • Andromeda
  • annual
  • arborescent
  • beanstalk
  • grower
  • hardiness
  • hardy
  • herb
  • herbaceous
  • mugwort
  • mustard
  • non-hardy
  • non-legume
  • non-leguminous
  • succulent
  • sundew
  • tenderness
  • tomatillo
  • trailing
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angiosperm
spermatophyte
(Definition ofgymnospermfrom theCambridge Advanced Learner's Dictionary & Thesaurus© Cambridge University Press)

Examplesofgymnosperm

gymnosperm
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.
From theCambridge English Corpus
The landscape then was dominated by mountain streams and deep lakes surrounded by forests ofgymnospermtrees.
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The receptive part of thegymnospermovule is called the "micropyle".
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Dominantgymnospermgenera were replaced post-boundary by lycophytesextant lycophytes are recolonizers of disturbed areas.
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It is found in bothgymnospermand angiosperm plants.
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And some of thegymnospermfamilies have been revised.
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Thegymnospermvegetative meristem lacks organization into distinct tunica and corpus layers.
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The former, a plant pathogen, causes leafy gall disease in both angiosperm andgymnospermplants.
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Thegymnospermtrees include conifers, cycads, ginkgophytes and gnetales.
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The foliage of this tropical angiosperm tree looks like that ofgymnospermpine trees which typically grow in temperate climates.
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More than one embryo is usually initiated in eachgymnospermseed.
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Polypores are often restricted to either deciduous (angiosperm) or conifer (gymnosperm) host trees.
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Since its seeds are not protected by an ovary wall, it can morphologically be considered agymnosperm.
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The life cycle of agymnospermis similar.
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The most common example of germination is the sprouting of a seedling from a seed of an angiosperm orgymnosperm.
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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.
#https://dictionary.cambridge.org//dictionary/english/gymnosperm##
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更新时间：2025/2/10 20:12:09