Question

what are the post-fertilization events which takes place in a flower after fertilization?

Answer 1

After fertilisation, formation of diploid cells, ovary changes to fruit and ovule into seed

Answer 2

Answer for Class 12 Biology Students

Post- Fertilization events:

 Development of endosperm.

 Development of embryo.

 Maturation of ovules into seeds.

 Maturation of ovary into fruit.

Development of Endosperm:

 Endosperm development precedes embryo development.

 The primary endosperm cell divides repeatedly and forms a triploid endosperm tissue.

 This tissue is filled with reserved food material which is used to nourish developing embryo.

 Generally PEN undergoes successive nuclear division, to give rise to free nuclei. This stage of endosperm development is called free nuclear endosperm. Later cell wall formation occurs and the endosperm becomes cellular. Example: Coconut water is free nuclear endosperm and the surrounding white kernel is the cellular endosperm.

 Endosperm may either be completely consumed by developing embryo (For example: Pea and groundnut) before seed maturation and it may persist in mature seed (Example: Castor and coconut).

Development of Embryo (Embryogenesis):

 Embryo develops at micropylar end of embryo sac where zygote is situated.

 Most zygotes divide only after some amount of endosperm is formed. This is an adaptation to provide assured nutrition to the developing embryo.

 The process of development of embryo is called embryogenesis.

 The process of development of embryo is called embryogenesis.

 Zygote elongates and divides to form two unequal cells. The larger basal cell is called suspensor cell and the other cell towards antipodal end is called embryo cell.

 The suspensor cell divides repeatedly to produce filamentous suspensor which helps pushing the embryo into the endosperm.

 Embryo cell undergoes repeated division and forms an undifferentiated globular mass of cells. This stage is called globular stage.

 Later globular mass of cells differentiates into radicle, plumule and cotyledons. At this stage embryo becomes heart shaped and further develops to form mature embryo.

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