Question

which pair correctly matches a process with its immediate effect on co2?
combustion - reduces co2
decomposition - removes co2 from air
cellular respiration - releases co2
photosynthesis - releases co2

Explanation:

• Combustion: Combustion of fuels like coal, oil, and gas releases \(CO_2\) into the atmosphere, it does not reduce \(CO_2\).
• Decomposition: Decomposition of organic matter (in the presence of oxygen) releases \(CO_2\) into the air. It does not remove \(CO_2\) from the air.
• Cellular respiration: The chemical equation for cellular respiration is \(C_6H_{12}O_6+6O_2

ightarrow6CO_2 + 6H_2O+\text{energy}\). So, it releases \(CO_2\).

• Photosynthesis: The chemical equation for photosynthesis is \(6CO_2+6H_2O

ightarrow C_6H_{12}O_6 + 6O_2\). It takes in \(CO_2\) from the air (does not release \(CO_2\)).

Answer:

Cellular respiration — releases \(CO_2\)