cotyledon

(noun)

the leaf of the embryo of a seed-bearing plant; after germination it becomes the first leaves of the seedling

Related Terms

  • synergid
  • dicot
  • heterosporous
  • angiosperm
  • basal angiosperm
  • monocot

Examples of cotyledon in the following topics:

  • Double Fertilization in Plants

    • In dicots (eudicots), the developing embryo has a heart shape due to the presence of the two rudimentary cotyledons.
    • In this case, the food reserves are moved into the two cotyledons.
    • As the embryo and cotyledons enlarge, they become crowded inside the developing seed and are forced to bend.
    • Ultimately, the embryo and cotyledons fill the seed, at which point, the seed is ready for dispersal .
    • (b) In the second stage, the developing embryo has a heart shape due to the presence of cotyledons.
  • Development of the Seed

    • Monocot and dicot seeds develop in differing ways, but both contain seeds with a seed coat, cotyledons, endosperm, and a single embryo.
    • The portion of the embryo between the cotyledon attachment point and the radicle is known as the hypocotyl.
    • In monocots, the single cotyledon is called a scutellum; it is connected directly to the embryo via vascular tissue.
    • Dicots (left) have two cotyledons.
    • The embryonic axis comprises everything between the plumule and the radicle, not including the cotyledon(s).
  • Diversity of Angiosperms

    • Angiosperm diversity is divided into two main groups, monocot and dicots, based primarily on the number of cotyledons they possess.
    • Flowering plants are divided into two major groups according to the structure of the cotyledons and pollen grains, among others.
    • Plants in the monocot group are primarily identified as such by the presence of a single cotyledon in the seedling.
    • Eudicots, or true dicots, are characterized by the presence of two cotyledons in the developing shoot.
  • Development of the Extraembryonic Coelom

    • Blood is carried to the villi by the paired umbilical arteries, which branch into chorionic arteries and enter the chorionic villi as cotyledon arteries.
  • The Life Cycle of an Angiosperm

    • The zygote develops into an embryo with a radicle, or small root, and one (monocot) or two (dicot) leaf-like organs called cotyledons.
    • The cotyledons serve as conduits to transmit the broken-down food reserves from their storage site inside the seed to the developing embryo.
  • Chance Models in Genetics

  • Placenta

    • On the maternal side, these tree structures are grouped into lobules called cotyledons.
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