What energy-rich molecule is produced during photosynthesis?

• A. Carbon dioxide
• B. Glucose
• C. Atp
• D. Water

Answer: (B)

During photosynthesis, glucose is the primary energy-rich molecule produced. The process takes place in the chloroplasts of plant cells, where energy from sunlight is harnessed to convert carbon dioxide and water into glucose and oxygen. This reaction can be summarized by the overall equation:

6 CO₂ + 6 H₂O + light energy → C₆H₁₂O₆ + 6 O₂

In this equation, glucose (C₆H₁₂O₆) is the organic molecule that serves as a source of stored energy, which can be later used by the plant or consumed by other organisms as part of the food chain. Unlike carbon dioxide, which is a reactant and part of the environment, or water, which is also a reactant but not an energy store, glucose acts as a stable energy reserve. While ATP is an important energy carrier in cells and is produced during the light-dependent reactions of photosynthesis, it is not the main energy-rich molecule formed through the overall process of photosynthesis; rather, ATP is used in various biochemical processes within the cell. Thus, glucose is accurately identified as the energy-rich product of photosynthesis.