BIOCHAP7B

Question 1

Barrier type

chemical

Answer 1

inhibits growth of pathogens to destroy pathogens (toxins)

eg: oxalic acid, phenols

Question 2

barrier type
physical

Answer 2

barriers that prevent entry of pathogens

eg:thick bark, waxy cuticles on leaves, galls,closing stomata

Question 3

in animals:
Physical barriers

(prevents entery of pathogens)

Answer 3

Mucus secretions and cilia (small hair like cells that moves around to promote movement),
Intact skin

Question 4

in animals

chemical
(inhibits growth of pathogens o destroy it)

Answer 4

Stomach acid,
digestive enzymes,
Acidic sweat,
Antibacterial proteins in semen

Question 5

in animals

Microbiological barriers
(prevents colonisation of pathogenic microorganisms)

Answer 5

Normal flora on skin, in the gastrointestinal tract, and vagina