Ontario Grade 9 Science Class Practice Exam

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What is the equation for cellular respiration?

C6H12O6 + 6O2 ---> 6CO2 + 6H2O
6CO2 + 6H2O ---> C6H12O6 + 6O2
H2O + CO2 ---> O2 + C6H12O6
O2 + C6H12O6 ---> CO2 + H2O

The correct answer is: C6H12O6 + 6O2 ---> 6CO2 + 6H2O

The correct equation for cellular respiration is C6H12O6 + 6O2 ---> 6CO2 + 6H2O. This is because the process of cellular respiration involves breaking down glucose (C6H12O6) into carbon dioxide (CO2) and water (H2O) in the presence of oxygen (O2) to release energy in the form of ATP. Option B is the opposite of the correct equation and does not accurately represent the process of cellular respiration. Option C and D do not include all of the necessary components, such as glucose, oxygen, and carbon dioxide. Therefore, option A is the most accurate and complete equation for cellular respiration.