Van Neil's hypothesis about the production of oxygen during photosynthesis was based on the study and investigations of:
Correct answer: A. Bacteria
- A. Bacteria
- B. Algae
- C. Protonema
- D. Cyanobacteria
Explanation
Van Niel's hypothesis was formulated from his work with photosynthetic bacteria that utilized hydrogen sulfide (H₂S) instead of water, releasing sulfur instead of oxygen. This led him to propose that plants split water (H₂O) to release oxygen during photosynthesis. His hypothesis was later confirmed by experiments using heavy isotopes of oxygen (O18). The other options-algae, protonema, and cyanobacteria-were not the focus of Van Niel's original research on this specific hypothesis.
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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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