What is the source of oxygen released in photosynthesis - CO2 or H2O?

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Solution

Oxygen released as a by-product during photosynthesis is released by the photolysis of water.

The light energy absorbed by the chlorophyll is used in splitting the water molecule (H2O) into its two components (Hydrogen and Oxygen) and releasing electrons.

Thus, water (H2O) is the source of oxygen released during photosynthesis.

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