Post-fertilisation structures and events:-

Post-fertilisation events: Endosperm & embryo development, maturation of ovule(s) into seed(s) & ovary into fruit.

Endosperm development:-

• The primary endosperm cell divides repeatedly and forms a triploid endosperm tissue.
• Endosperm cells are filled with reserve food materials. They are used for the nutrition of the developing embryo.
• In common endosperm development, the PEN undergoes successive nuclear divisions to give rise to free nuclei.
• This stage is called free-nuclear endosperm. The number of free nuclei varies greatly.
• Then the endosperm becomes cellular due to the cell wall formation. The tender coconut water is a free-nuclear endosperm (made up of thousands of nuclei) and the surrounding white kernel is the cellular endosperm.