Respiration and gas exchange (humans + plants) Flashcards
1
Q
How is a leaf specialised for gas exchange?
A
thin - short diffusion distance
large SA - increasing number of stomata for CO2 diffusion
2
Q
What gases diffuse in and out of leaves?
A
water vapour, oxygen, carbon dioxide
3
Q
Why do stomata close?
A
to reduce water loss
4
Q
What happens when the guard cells are flaccid?
A
cell walls cannot be held apart - stomata shrinks and closes
5
Q
What happens when the guard cells are turgid?
A
bend outwards - opens stomata
