Assertion: endosperm | /r/CapableOf | serve as a source of nutrition
Facets:
value: for the developing embryo
type: TRANSITIVE-OBJECT
Source sentences:
text: One sperm fertilizes the egg cell, forming a diploid zygote; the other sperm fuses with the two polar nuclei, forming a triploid cell that develops into the endosperm, which serves as a source of nutrition for the developing embryo.