BIOL - Gas Exchange in Plants
Biology, gas exchange in plants, stomata, structure of leaf - IGCSE | IBDP | DSE | GCE | IAL | AP Biology
During respiration, plants take up oxygen and release carbon dioxide.
Conversely, during photosynthesis, plants take up carbon dioxide and release oxygen.
Chemical equation for aerobic respiration: C6H12O6 + 6O2 → 6CO2 + 6H2O
Chemical equation for photosynthesis: 6CO2 + 6H2O → C6H12O6 + 6O2
Net gas exchange depends on the light intensity
Photosynthesis happens only during day when there is light.
Respiration happens during both day and night because plants need energy all day.
When it is dark...
👇 A summary of the effect of light intensity on the net gas exchange in plants 👇
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Much of gas exchange in plants happens at the leaves through diffusion: Oxygen and carbon dioxide diffuse in and out of stomata.
Structure of Leaves is Adapted for Gas Exchange
How stomata controls gas exchange:
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