Question

is lignin present in all 4 elements of xylem​

Answer 1

Answer:

Lignin is a class of complex organic polymers that form important structural materials in the support tissues of vascular plants Lignins are particularly important in the formation of cell walls, especially in wood and bark, because they lend rigidity and do not rot easily. Chemically, lignins are cross-linked phenolic polymers , Lignin plays a crucial part in conducting water in plant stems. The polysaccharide components of plant cell walls are highly hydrophilic and thus permeable to water, whereas lignin is more hydrophobic. The crosslinking of polysaccharides by lignin is an obstacle for water absorption to the cell wall. Thus, lignin makes it possible for the plant's vascular tissue to conduct water efficiently .

So it role

• support plant .
• Prevent water loss .