Question

cells produce carbon dioxide waste in what chemical process?
photosynthesis
gas exchange
all of these
cellular respiration

Explanation:

• Photosynthesis is the process by which plants use carbon dioxide to make glucose and release oxygen, so it does not produce carbon dioxide as a waste.
• Gas exchange is the process of exchanging gases (like oxygen and carbon dioxide) between an organism and its environment, not a process that produces carbon dioxide waste in cells.
• Cellular respiration is the process in cells where glucose is broken down to release energy, and carbon dioxide is produced as a waste product (the chemical equation is $C_6H_{12}O_6 + 6O_2

ightarrow 6CO_2 + 6H_2O + \text{energy}$).

• "All of these" is incorrect because the other options do not fit.

Answer:

D. Cellular respiration