Multiple choice

Cork becomes impervious to water by the deposition of

  1. suberin

  2. lignin

  3. chitin

  4. pectin

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A Correct answer
Explanation

At maturity the cork cells are nonliving, and their inner walls are lined with suberin, a fatty substance that is highly impermeable to gases and water (which is why cork is used to stop wine bottles). The walls of cork cells may also contain lignin.

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