Describe the diffusion of oxygen out of the plant which is produced during photosynthesis.
Mesophyll cells produce oxygen as a result of photosynthesis.
Oxygen diffuses into the air spaces from the cells.
This increases the concentration of oxygen in the air spaces, causing oxygen to move from the air spaces to outside the leaf via the stroma.
Describe the diffusion of carbon dioxide for photosynthesis in a plant.
Mesophyll cells photosynthesise reducing the conc. of CO2 in the cells.
CO2 diffuses from the air spaces into the cells.
This in turn reduces the CO2 concentration in the air spaces causing CO2 to move into the air spaces from the air outside of the leaf through the stroma.
What adaptations do leaves have for an efficient gas exchange system?
They are flat providing a large surface area.
They have stroma which are pores to allow air to move in and out of the leaf.
There are air spaces in the leaf which provide a short diffusion distance between mesophyll cells and air.
