The diagram shows carbon dioxide moving between the air and green plants. Arrows G and R show two processes. Which pair of processes both remove carbon diox...
Question 1 Report
The diagram shows carbon dioxide moving between the air and green plants. Arrows G and R show two processes. Which pair of processes both remove carbon dioxide from the atmosphere?
Answer Details
Read the direction of each arrow. Arrow G points from the air into the plants, which is photosynthesis: 6CO2 + 6H2O → C6H12O6 + 6O2, so carbon dioxide is taken out of the atmosphere. Arrow R points from the plants back to the air, which is respiration, and that adds carbon dioxide.
The other major removal route is carbon dioxide dissolving in the oceans, where it forms hydrogencarbonate ions and is used by organisms to build shells. So photosynthesis together with dissolving in the oceans gives two genuine removal processes. Respiration, combustion and volcanic activity all release carbon dioxide instead. Decide for each named process whether it adds carbon or removes it.
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