Question

which component of earths atmosphere is decreased due to photosynthesis?
○ ozone
○ oxygen
○ hydrogen peroxide
○ carbon dioxide

Explanation:

Photosynthesis is the process by which plants use sunlight, carbon dioxide ($\ce{CO_2}$), and water to produce glucose and oxygen. The reaction is $6\ce{CO_2} + 6\ce{H_2O} \xrightarrow{\text{light energy}} \ce{C_6H_{12}O_6} + 6\ce{O_2}$. During this process, carbon dioxide is consumed (decreased) as it is used to make glucose, while oxygen is produced (increased). Ozone and hydrogen peroxide are not directly involved in the basic photosynthesis reaction.

Answer:

D. carbon dioxide