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Traductions de „gymnosperms“ dans le dictionnaire anglais » arabe

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gymnosperms
gymnosperm: Substantif

gymnosperms BOT

gymnosperms

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gymnosperm <gymnosperm; gymnosperms> SUBST

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In gymnosperms the megagametophyte consists of several thousand cells and produces one to several archegonia, each with a single egg cell. en.wikipedia.org

More complex tracheids with valve-like perforations called bordered pits characterise the gymnosperms. en.wikipedia.org

In many gymnosperms and all angiosperms, the male gametophytes have been reduced to pollen grains and their antheridia have been reduced to a single generative cell within the pollen grain. en.wikipedia.org

They are instead cone-bearing gymnosperms that are most closely related to ferns, conifers and ginkgo. en.wikipedia.org

Such arils are also found in a few species of gymnosperms, notably the yews and related conifers. en.wikipedia.org

The larvae are polyphagous, but prefer small-leaved, hard-leaved gymnosperms and dicotyledonous angiosperms. en.wikipedia.org

However, examination of fossil mecopterans show they had siphon feeding apparatus that could fertilize early gymnosperms by feeding on their nectar and pollen. en.wikipedia.org

Once the pollen grain lands on the stigma of a receptive flower (or a female cone in gymnosperms), it takes up water and germinates. en.wikipedia.org

Flowering plants do not produce flagellate cells, but ferns, mosses, green algae, some gymnosperms and other closely related plants do. en.wikipedia.org

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