Biology for IGCSE & O level - Transport In Plants (Section 4 - No. 43)
What is the role of lignin in xylem vessels?
To transport sugars.
To provide flexibility to the vessel walls.
To strengthen the vessel walls and prevent collapse.
To regulate the opening and closing of stomata.
Explanation
Lignin provides strength and rigidity to the xylem vessel walls, preventing them from collapsing under the tension created by transpiration pull.
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