Which of following does not occur during light reaction?
Correct answer: D. Release of H2
- A. Electron transfer
- B. Release of O2
- C. Photolysis of H2O
- D. Release of H2
Explanation
The light-dependent reactions of photosynthesis, also known as the light reactions, occur in the thylakoid membranes of chloroplasts. During these reactions, sunlight is absorbed by chlorophyll, exciting electrons which are then transferred through the electron transport chain. This process results in the production of ATP and NADPH, which are essential for the Calvin cycle. Additionally, the photolysis of water occurs, splitting water into oxygen, protons, and electrons. Oxygen is released as a byproduct, while the protons contribute to the proton gradient used to produce ATP. The release of hydrogen gas (H2) does not occur during these reactions. Therefore, the correct answer is Option D: Release of H2.
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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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