Plant Defences

Question 1

Physical plant defences from pathogens

Answer 1

1) callose production in plasmodesmata acts as a barrier so pathogens can’t enter
2) lignin is added so mechanical barrier to inavasion even thicker and stronger
3) stomata closes to prevent entry through the stoma

Question 2

Chemical plant defences of plant

Answer 2

1) insect repellents
2) antibacterial compounds like phenols which disrupt bacterial membranes
3) general toxins produced when chemicals are broken

Question 3

How is plant response to pathogen triggered

Answer 3

1) receptors in cells respond to molecules from pathogen
2) stimulates release of signalling molecules that switch genes on in nucleus
3) triggers cellular responses to produce chemical responses and physical strength