In oxygenic photosynthesis in plants and algae, which two products are generated from carbon dioxide and water using light energy?

• A. ATP and NADPH
• B. Carbon dioxide and water
• C. Glucose (sugar) and oxygen
• D. Lactic acid and ethanol

Answer: (C)

Verified step by step guidance

1. Understand the overall process of oxygenic photosynthesis, which occurs in plants and algae, where light energy is used to convert carbon dioxide (CO\_2) and water (H\_2O) into organic molecules and oxygen.
2. Recall the general photosynthesis equation: \$6CO\_2 + 6H\_2O + light \ energy \rightarrow C\_6H\_{12}O\_6 + 6O\_2$, where glucose (C\_6H\_{12}O\_6) and oxygen (O\_2) are the main products.
3. Recognize that ATP and NADPH are energy carriers produced during the light-dependent reactions, but they are not the final products formed from CO\_2 and H\_2O; instead, they are used in the Calvin cycle to synthesize glucose.
4. Identify that lactic acid and ethanol are products of anaerobic respiration or fermentation, not oxygenic photosynthesis.
5. Conclude that the two main products generated from carbon dioxide and water using light energy in oxygenic photosynthesis are glucose (a sugar) and oxygen.