plant defences passive

Question 1

what is a passive defence

Answer 1

defences present before infection of pathogen/ prevent the entry of pathogen

Question 2

What acronym helps remember all the plant passive defences

Answer 2

Cool- Cellulose Cell wall
Cats- callose
Like- Lignin thickening
When- Waxy cuticle
Birds- Bark
Stand - Stomatal closure
Tall- Tylose

Question 3

what is a callose

what is a tylose

Answer 3

callose- large polysaccharide which is deposited in sieve tubes blocking flow and prevents spread of pathogen

Tylose- Balloon like swelling filling the xylem to stop it carrying water, prevents the spread of pathogens in water.

Question 4

how do these functions prevent pathogens

-cell wall
-lignin
-stomatal closure

Answer 4

Cellulose cell wall- physical barrier and contains chemical defences which activate when pathogen is detected

Lignin- indigestable and waterproof

Stomata- Guard cells close stomata when pathogens are detected near by

Question 5

How do these features of passive defence prevent pathogen

Waxy cuticle
bark

Answer 5

Bark- contains chemical defences

Waxy cuticle- prevents water collecting on leaf, pathogens need water to survive, therefore cant enter due to lack of water