Multiple choice

Which of the following is the hardest plant product?

  1. Lignin

  2. Cutin

  3. Suberin

  4. Sporopollenin

  5. -

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

Sporopollenin is one of the most chemically inert biological polymers. It is a major component of the tough outer (exine) walls of plant spores and pollen grains. It is chemically very stable and is usually well preserved in soil.