explain the formation of mature embryo from embry sac?
Asked by vasturushi | 2nd Jun, 2017, 10:50: PM
The development of an embryo from a zygote is called embryogeny. The development takes place at the micropylar end of the embryo sac. Most of the zygotes divide only after a certain amount of endosperm is formed. This provides assured nourishment to the developing embryo.
Development of Embryo in Dicots:

- The zygote divides into two unequal cells, larger suspensor cell towards the micropyle and a smaller embryonal cell towards the antipodal region.
- The suspensor cell undergoes transverse division to form 6-10 celled suspensor.
- The suspensor cell towards the micropylar end is large and is called haustorium or vesicular cell.
- The suspensor cell towards the embryonal cell is called hypophysis which forms the radicle tip.
- The embryonal cell divides twice vertically and once transversely to produce a two-tiered eight-celled embryo.
- The epibasal tier forms two cotyledons and a plumule while the hypobasal tier produces only hypocotyl and most of the radicle.
- The octant embryo undergoes periclinal divisions to produce protoderm, procambium and ground meristem.
- Protoderm forms epidermis, procambium forms stele and ground meristem produces cortex and pith.
- Initially, the embryo is globular and undifferentiated and is called proembryo.
- It is then transformed into embryo with the development of radicle, plumule and cotyledons.
The development of an embryo from a zygote is called embryogeny. The development takes place at the micropylar end of the embryo sac. Most of the zygotes divide only after a certain amount of endosperm is formed. This provides assured nourishment to the developing embryo.
Development of Embryo in Dicots:
- The zygote divides into two unequal cells, larger suspensor cell towards the micropyle and a smaller embryonal cell towards the antipodal region.
- The suspensor cell undergoes transverse division to form 6-10 celled suspensor.
- The suspensor cell towards the micropylar end is large and is called haustorium or vesicular cell.
- The suspensor cell towards the embryonal cell is called hypophysis which forms the radicle tip.
- The embryonal cell divides twice vertically and once transversely to produce a two-tiered eight-celled embryo.
- The epibasal tier forms two cotyledons and a plumule while the hypobasal tier produces only hypocotyl and most of the radicle.
- The octant embryo undergoes periclinal divisions to produce protoderm, procambium and ground meristem.
- Protoderm forms epidermis, procambium forms stele and ground meristem produces cortex and pith.
- Initially, the embryo is globular and undifferentiated and is called proembryo.
- It is then transformed into embryo with the development of radicle, plumule and cotyledons.
Answered by Sheetal Kolte | 3rd Jun, 2017, 12:45: PM
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