The graph shows the effect of increasing light intensity on the net rate of carbon dioxide uptake by a freshwater plant.
a.[2]
Describe the effect of increasing light intensity on the net rate of carbon dioxide uptake.
b.[1]
Explain why there is no net exchange of carbon dioxide at point C.
c.[2]
Describe how you could use hydrogencarbonate indicator to investigate how the exchange of carbon dioxide by an aquatic plant changes in the dark compared to in the light.