Why do xylem cells contain spirals of lignin?

A. To prevent the mixing of water with other substances

B. In order to overcome the pressure of water as it moves through the plant

Correct Answer: B. The walls of the xylem are strengthened with a substance called lignin. It helps it withstand the water pressure.

C. To allow the uptake of minerals from the soil

D. To prevent the shrinkage of the plant cells

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