1) Angiosperm reproduction can occur sexually through flowers producing seeds or asexually through vegetative reproduction.
2) Flowers contain reproductive structures like stamens which produce pollen and carpels containing ovules. Pollen grains contain male gametophytes while ovules contain female gametophytes.
3) Fertilization occurs through double fertilization - one sperm fuses with the egg to form a zygote and another with polar nuclei to form endosperm, providing nutrition for the developing embryo.