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Role of diffusion in plant gas exchange
CO₂ diffuses into leaf for photosynthesis
O₂ diffuses out
opposite occurs during respiration
Leaf adaptations for gas exchange
large surface area
thin structure
air spaces in spongy mesophyll
stomata present
Role of stomata
Pores controlled by guard cells:
open → gas exchange occurs
close → reduce water loss
Gas exchange day vs night
Day:
photosynthesis > respiration
net CO₂ enters
Night:
respiration only
O₂ enters, CO₂ leaves