Assertion: pistil's part | /r/CapableOf | serve as passageway
Facets:
value: to the pollen tube
type: TRANSITIVE-OBJECT
Source sentences:
text: The upper part of the carpel usually extends into a slender, sterile columnar process, which supports the stigma above the ovary—the fertile part of the carpel—and serves as a passageway to the pollen tube.