What was the source of hydrogen for first photosynthetic organisms?
Correct answer: D. Hydrogen sulphide
- A. Water
- B. Hydrogen present in soil
- C. Hydrogen sulphate
- D. Hydrogen sulphide
Explanation
Cyanobacteria are the first photosynthetic organisms. They used hydrogen sulfide as source of hydrogen.
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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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