The role of double fertilization in angiosperms is to produce

Explanation

Double fertilization :
(1) In flowering plant germinated pollen grain forms pollen tube . The end the pollen tube ruptures and two male gamets are releasaed un the embryosac
(2) out of two male gamets one gamets fuses with female gamet which is called fertillizatoin another male fuses with the secondary nacleus and forms endosperm.
(3) so in flowering plants fretilization occurs twice hence it is called double fertilizatoin.
use of endosperm :
(1) cotyledons develops by utilizing endosperm
(2) the cotyledons ytilizes the stored food in the endosperm
(3) some of the plants utilizes the endosperm completely and changes in tom seed .
(4) becaues of the stored food the size of the cotyledons increases.