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Question

During photosynthesis oxygen is released from
  1. Carbon dioxide
  2. Water
  3. Decomposition of Chlorophyll
  4. Air

A
Carbon dioxide
B
Water
C
Decomposition of Chlorophyll
D
Air
Solution
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Photosynthesis is a process by which leaves prepare their food by utilizing water and carbon dioxide in the presence of sunlight. Energy from sunlight is absorbed by chlorophyll and is used to break down the water molecules. This is called the photolysis of water. This process releases energy at the same time setting free hydrogen and oxygen. The energy is temporarily stored in two types of molecules NADP (Nicotinamide Adenine Dinucleotide Phosphate) and ATP (Adenosine triphosphate).
In this process, light energy gets converted into chemical energy.
So, the answer is B.

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