Question

how can you say that oxygen evolved during photosynthesis from water but not from carbon dioxide
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Answer 1

Explanation:

1. The oxygen during photosynthesis comes from split water molecules. During photosynthesis, the plant absorbs water and carbon dioxide. After the absorption, the water molecules are disassembled and converted into sugar and oxygen. ... This sugar is stored for energy.
2. Because sometimes they lead people to think that the oxygen (O2) produced by photosynthesis is derived from carbon dioxide (CO2).
3. Some even further compound their mistake by stating that plants actually convert CO2 into O2 at night!

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