Xylem walls are

Positively charged

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Negatively charged

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Electrochemically neutral

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Differentially permeable

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Solution

The correct option is C Negatively charged
Xylem walls are negatively charged due to carboxyl group present in it. The negative charge is due to galacturonic acid of pectin and glucuronic acid of lignin in the cell wall. It tends to bind to divalent cations like calcium ions.
Thus, the correct answer is option B.

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