Botany - Photosynthesis in Higher Plants Question with Solution | TestHub
Which of these conclusions drawn by Cornelius van Neil in his experiment on purple-sulphur bacteria is correct?
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Solution:
Cornelius van Niel (1897-1985), based on his studies of purple and green bacteria, demonstrated that photosynthesis is essentially a light-dependent reaction in which hydrogen from a suitable oxidisable compound reduces carbon dioxide to carbohydrates.
In green plants, H2O is the hydrogen donor and is oxidised to O2. Some organisms do not release O2during photosynthesis. When H2S, instead is the hydrogen donor for purple and green sulphur bacteria, the ‘oxidation’ product is sulphur or sulphate depending on the organism and not O2. Hence, he inferred that the O2evolved by the green plant comes from H2O, not from carbon dioxide. This was later proved by using radioisotopic techniques.
