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Hypocotyl
• The hypocotyl (short for "hypocotyledonous stem",
meaning "below seed leaf") is the stem of a germinating seedling, found below the
cotyledons (seed leaves) and above the radicle (root).
Epicotyl
• the epicotyl is the embryonic shoot above the cotyledons. In
most plants the epicotyl will eventually develop into the
leaves of the plant.
Radicle
• the radicle is the first part of a seedling (a growing plant
embryo) to emerge from the seed during the process of
germination
Cotyledon
• A cotyledon is a significant part of the embryo within the seed of
a plant. Upon germination, the cotyledon may become the
embryonic first leaves of a seedling.
Endosperm
• Endosperm is the tissue produced inside the seeds of most flowering plants around the time of fertilization. It surrounds the embryo and provides nutrition in the form of starch, though it can also contain oils and protein.
Embryo
• the part of a seed that develops into a plant, consisting (in the mature embryo of a higher plant) of a plumule, a radicle, and one or two cotyledons.
Seed coat
• A seed is an embryonic plant enclosed in a protective outer covering called the seed coat, usually with some stored food.