Question

Which of the following are examples of physical barriers involved in the first line of defense in plants?

A) Thorns, trichomes, and bark
B) Antibodies and toxins
C) Stomata and cuticle
D) Secondary metabolites and phytoalexins

Answer 1

Physical barriers in plant defense include thorns, trichomes, and bark, which serve to deter animals and protect the plants' internal tissues. The correct answer is option A).

Step-by-step explanation:

Examples of physical barriers involved in the first line of defense in plants include thorns, trichomes, and bark. These mechanical defenses are crucial as they protect plants from herbivores and other potential forms of damage. Thorns, which are modified branches, and trichomes, which are hair-like structures on plants, help to deter animals by causing physical discomfort or damage. Bark serves as a protective layer for trees, preserving the internal tissues from external harm. These structures are critical in maintaining a plant's first line of defense against predators and environmental stresses.