What are the products of photosynthesis?

• A. Glucose and oxygen
• B. Carbon dioxide and water
• C. Oxygen and heat
• D. Glucose and carbon dioxide

Answer: (A)

Photosynthesis stores energy by converting light, carbon dioxide, and water into a sugar, with oxygen released as a byproduct. The two final products are glucose and oxygen. Carbon dioxide and water are the inputs the plant uses to build glucose and release oxygen, not products. Oxygen with heat isn’t the right pairing here because the main energy storage product is glucose, and any heat is incidental to the reaction rather than a primary product. Glucose and carbon dioxide would imply carbon dioxide is produced, which isn’t the case.