Biology for IGCSE & O level - Transport In Plants (Section 5 - No. 12)
How does the presence of lignin contribute to the function of xylem?
It allows for the transport of sugars.
It provides strength and support to the xylem vessels.
It facilitates the exchange of gases.
It regulates water uptake.
Explanation
Lignin strengthens the xylem walls, preventing them from collapsing under the tension of water transport.
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