Assertion: xylem's cell wall | /r/CapableOf | become rigid
Facets:
Source sentences:
text: Lignin deposition is so thick that the cell walls become strong, rigid and impermeable to water which is also known as a stone cell or sclereids.
text: Lignin deposition is so thick that the cell walls become strong, rigid and impermeable to water which is also known as a stone cell or sclereids.