in Sexual reproduction in flowering plants by
What changes take place in a flower after fertilization?

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After fertilization, a series of changes takes place in the flower. The diploid zygote divides and redivides by mitosis to form a multicellular embryo.

The endosperm develops from the Primary Endospermic Nucleus (PEN). The ovules mature to form seeds and ovary develops into fruit.

The post-fertilization changes include:

  1. Formation of embryo.
  2. Formation of endosperm.
  3. Disorganization of nucellus.
  4. Formation of seed.
  5. Formation of fruit.
  6. Calyx, Corolla, Androecium and Style get dried and fall off.

Fate of different parts of a flower post-fertilization

No.

Before fertilization

After fertilization

1.

Ovary

Fruit

2.

Ovary wall

Pericarp (wall of fruit)

3.

Ovule

Seed

4.

Inner integument

Tegmen (Inner seed coat)

5.

Outer integument

Testa (Outer seed coat)

6.

Funicle

Stalk of seed

7.

Egg

Embryo

8.

Secondary nucleus (2n)

Primary Endospermic nucleus / Endosperm (3n)

9.

Antipodal cells

Degenerate

10.

Synergids

Degenerate

11.

Nucellus

Perisperm

12.

Hilum

Scar

 

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