Question

Why the primary endosperm cell divides reapeatedly and forms a triploid

Answer 1

The primary endosperm cell divides repeatedly and forms a triploid endosperm tissue because the cells of this tissue are filled with reserve food materials which are used for the nutrition of the developing embryo. 

Answer 2

The primary endosperm cell divide repeatedly and form a triploid endosperm because the cell of this tissue are filled with reserve food material and are used for the nutrition of developing embryo coz many fruit form after full utilization of endosperm.