Question

Explain double fertilisation and trace the post fertilisation events in sequential order leading to seed formation in a typical dicotyledonous plant.

Answer 1

After the process of pollination, the pollen grains germinate and thereby the pollen tube is formed. Each pollen grain has two male gametes they are carried to the ovary and eventually the ovule via the pollen tube. Tip of the tube bursts and the 2 male gametes are released in the embryo sac. One of the male gamete fuses with the egg cell this is called as fertilisation. The other male gamete unite with the two polar nuclei and this is termed as double fertilisation. After fertilisation the ovule develops into seed and the ovary into fruit.