The correct order of electron transfer in photosynthesis is:
Correct answer: A. H₂O --> NADPH --> Calvin cycle
- A. H₂O --> NADPH --> Calvin cycle
- B. None of these
- C. H₂O --> O₂ --> NADPH
- D. H₂O --> PS-I --> PS-II
Explanation
'H₂O --> NADPH --> Calvin cycle' is the correct option as water is first split to form oxygen, hydrogen ions, and electrons. The electrons and hydrogen ions are used to reduce NADP+ to NADPH. This NADPH, which contains the electrons, is then utilized in the calvin cycle to eventually form carbohydrates.
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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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