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Question

The source of oxygen, liberated during photosynthesis is from
  1. Carbohydrate present in leaf.
  2. Water.
  3. Photosynthetic enzyme.
  4. Carbon dioxide.

A
Photosynthetic enzyme.
B
Carbohydrate present in leaf.
C
Carbon dioxide.
D
Water.
Solution
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Oxygen is produced by photolysis of water. This photolysis of water is brought about by the light, usually sunlight. Photolysis is a part of the light-dependent reactions of photosynthesis. The electrons released during the photolysis is picked up by the photosystem I during light reaction.
So, the correct answer is option C.

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