The phrase "double fertilization" in angiosperms is best described as each
pollen grain containing two sperm cells and one leading to the fertilization
that produces the embryo and the other leads to the fertilization that
produces the endosperm.
Angiosperms perform double fertilization which involves the sperm fusing
with the egg to form a zygote and the other sperm fusing with the polar
nuclei of the plants to form an endosperm.
Angiosperms are referred to as flowering plants and these plants have seeds which are enclosed in a fruit.
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