In the photosynthesis equation 6 CO_2 + 6 H_2O ightarrow C_6H_{12}O_6 + 6 O_2, which is the main source of energy driving the reaction?

• A. Carbon dioxide
• B. Oxygen
• C. Glucose
• D. Sunlight

Answer: (D)

Verified step by step guidance

1. Identify the overall photosynthesis reaction: \$6\ CO_2 + 6\ H_2O \rightarrow C_6H_{12}O_6 + 6\ O_2$.
2. Understand that photosynthesis is an endothermic process, meaning it requires energy input to convert carbon dioxide and water into glucose and oxygen.
3. Recognize that the energy required to drive this reaction comes from an external source, not from the reactants or products themselves.
4. Recall that in nature, the energy source for photosynthesis is sunlight, which provides the energy needed to convert \(CO_2\) and \(H_2O\) into glucose.
5. Conclude that sunlight is the main source of energy driving the photosynthesis reaction, enabling the formation of glucose and oxygen.