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 Oxygen liberated during photosynthesis comes from
(a) water
(b) chlorophyll
(c) carbon dioxide
(d) glucose

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Photosynthesis, the process by which green plants and certain other organisms transform light energy into chemical energy.
Chlorophyll absorbs ultraviolet rays and breaks the water molecule and forms oxygen. So, we get oxygen from the water molecule.

6CO_{2} + 6 H_{2}O \rightarrow C_{6}H_{12}O_{6} + 6O_{2}

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