Water Molecules in Photosynthesis — NEET Biology

Which of the following statements correctly describe the implications of Cornelius van Niel's work on the understanding of photosynthesis? S1: He demonstrated that photosynthesis is essentially a light-dependent reaction where CO2 is reduced to carbohydrates. S2: His studies on purple and green sulfur bacteria showed that H2S is oxidized to sulfur or sulphate, not oxygen. S3: He inferred that the oxygen evolved by green plants comes from carbon dioxide, not from water. S4: His generalized equation for photosynthesis highlights that a suitable oxidisable compound donates hydrogen for CO2 reduction. S5: The experimental evidence from his work directly supported the splitting of water as the source of oxygen in green plants, later confirmed by radioisotopic techniques.