Assertion: angiosperm's pollen | /r/HasProperty | released
Facets:
Source sentences:
text: In the more primitive angiosperms and in all magnoliids, pollen grains are released in the two-celled condition (one tube cell, which expands to form the pollen tube at germination, and one generative cell, which divides to form two sperm cells); in advanced subclasses of flowering plants, they are released in a three-celled condition (one tube cell and two sperm cells), because sperm cells are formed before the pollen is released.