Embryo Formation

Embryo formation: Embryo develops at the micropylar end of the embryo sac where
the zygote is situated. Most of the zygotes divide only after certain amount of endosperm is formed to provide  assured nutrition to the developing embryo.Early stages of embryo development is known as Embryogeny

The zygote gives rise to the proembryo and then to the globular, heart-shaped and mature embryo.

Dicotyledonous embryo consists of an embryonal axis and two cotyledons.

Epicotyl: It is the portion of embryonal axis above the level of cotyledons, which terminates with the plumule.

 Hypocotyl: It is the the cylindrical portion below the level of cotyledons  that terminates at its lower end in the root tip.

Embryos of monocotyledons  possesses only one cotyledon.

Scutellum : In the grass family the cotyledon which is situated towards one side (lateral) of the embryonal axis is called Scutlleum.

Coleorrhiza: The radical and root cap is enclosed in an undifferentiated sheath called coleorrhiza.

Epicotyl is  the portion of the embryonal axis above the level of attachment of scutellum .



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