Sentence examples for cotyledon from inspiring English sources
noun
The leaf of the embryo of a seed-bearing plant; after germination it becomes the first leaves of the seedling.
Embryos generally have a single terminal cotyledon and a tiny lateral, sometimes sunken primary bud (plumule).
Most of them are distinguished by the presence of only one seed leaf, or cotyledon, in the embryo contained in the seed.
No cotyledon, stem apex, or root apex is organized in this early period; these organs do not appear until after germination has occurred.
The scutellum arises from octant cells, which also contribute to the cotyledon.
The scutellum is thought to be a modified cotyledon, or seed leaf.
The single cotyledon, the parallel-veined leaves, the scattered vascular bundles in the stem, the absence of a typical cambium, and the adventitious root system of monocots are all regarded as derived characteristics within the angiosperms, and any plant more primitive than the monocots in these several respects would certainly be a dicot.
In this manner two cotyledons form.
Dicotyledons, in contrast, ordinarily have two cotyledons.
The seed has virtually no endosperm; its reserve food is stored largely in the two cotyledons (seed leaves) of the embryo.
Other cotyledons may rise above the soil surface (epigean germination) by elongation of the hypocotyl, the embryonic axis between the root and the growing stem, or epicotyl.
A walnut is a drupe in which the pericarp has differentiated into a fleshy outer husk and an inner hard "shell"; the "meat" represents the seed two large convoluted cotyledons, a minute epicotyl and hypocotyl, and a thin papery seed coat.
