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  1. O2 released in the process of photosynthesis comes from

    2. A.

     CO2
    B.

     water
    C.

     sugar
    D.

     pyruvic acid

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    Answer : Option B

    Explanation :

    Photosynthesis is the process by which plants use the energy of light to produce carbohydrates and molecular oxygen (O2) from carbon dioxide (CO2) and water.

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