Light energy is converted into chemical energy through the formation of what?
Correct answer: A. ATP
- A. ATP
- B. NADPH
- C. Glucose
- D. Oxygen
Explanation
ATP is the correct option because it is the direct form of chemical energy produced during the light-dependent reactions of photosynthesis. When chlorophyll absorbs light energy, it excites electrons that move through the electron transport chain in the thylakoid membrane, leading to the formation of ATP through photophosphorylation. This ATP stores the captured light energy in its high-energy phosphate bonds and is immediately used to power the synthesis of glucose and other organic molecules during the Calvin cycle. It represents the most immediate and usable form of chemical energy generated from light.NADPH is incorrect because it serves mainly as a reducing power, not as the primary energy currency.Glucose is incorrect because it is produced later using ATP and NADPH, not directly from light energy.Oxygen is incorrect because it is only a byproduct of water splitting and does not store chemical energy.
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About Bioenergetics
Cellular respiration explains how cells release energy from glucose through glycolysis, the link reaction, Krebs cycle and electron transport chain. It includes ATP production, substrate-level and oxidative phosphorylation, aerobic versus anaerobic respiration, and the roles of mitochondria, oxygen and fermentation in energy transfer.
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