Plant Defenses

Question 1

Name 3 physical barriers used by plants.

Answer 1

• The cellulose cell walls strengthen plant cells and prevent invasion by pathogens
• The tough waxy cuticle on the surface of the leaves acts as a barrier.
• Bark on trees and a layer of dead cells on the outside of stems act as a protective layer.

Question 2

Name 2 chemical barriers used by plants.

Answer 2

• Antibacterial chemicals are produced to protect against invading pathogens.
• Some plants produce poisons that deter herbivores.

Question 3

Name 3 other defence mechanisms used by plants.

Answer 3

• Thorns
• Hairy stems and/or leaves
• Poisons