Examlex
Contaminating materials include all the following EXCEPT:
Phloem
The vascular tissue in plants responsible for transporting sugars and other metabolic products downward from the leaves.
Vascular Tissue
The specialized tissue in plants that conducts water and nutrients through the plant body, comprising mainly of xylem and phloem.
Lignin
A substance found in many plant cell walls that confers rigidity and strength, particularly in woody tissues.
Polymer
A large molecule composed of repeating structural units, typically connected by covalent chemical bonds, found in many materials and biological systems.
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