The first hypothesis that oxygen released during photosynthesis is derived from water was proposed by

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Engelmann

Priestley

Van Niel

Blackman

answer is C.

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Detailed Solution

Van Niel discovered that the oxygen produced during photosynthesis is taken from water while researching the process of purple sulfur bacteria. Van Niel spoke of a similar visionary who was associated with green flora. He explained how light causes water to split into hydrogen and oxygen in green plants. The equation for photosynthesis, according to Van Niel's theory, is

6C0₂ + 12H₂0 → C₆H₁₂O₆ + 6H₂O + 6O₂.

He describes food making process by the plant as a light-dependent process, in which carbon dioxide is reduced to cellular material by the action of the hydrogen released from the oxidisable compound.

Hence, option C is the correct answer.

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