Multiple choice

The walls of cork cells are thickened by the deposition of an organic substance, which makes these cells impermeable to water and gases. This substance is called

  1. pectin

  2. lignin

  3. suberin

  4. None of these

  5. _

Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Walls that form small bundles of durable layers of tissue in most plants is called sclereid.