How do you prove that the source of oxygen in photosynthesis is the w

1.	How do you prove that the source of oxygen in photosynthesis is the water molecule and not carbon dioxide ?
Answer» Source of O₂ In Photosynthesis is water: (i) It was previously assumed that the source of oxygen in photosynthesis was CO₂ and not H₂O molecules. (ii) According to recent studies, oxygen is evolved from water and not from CO₂. (iii) It was proved by the use of radioactive elements For example, the water containing heavy oxygen (H₂O₁₈) was supplied to the leaves in place of natural osygen, (H₂O₁₆). (iv) On observation it was found that oxygen evolved in photosynthesis was heavy oxygen ¹⁸O₂ and not the natural oxygen. (v) Now, the heavy isotope of carbon dioxide (C₁₄O₂) was supplied to the plant. (vi) Thus, it showed that in photosynthesis, oxygen is evolved from water molecules and not from carbon dioxide.

How do you prove that the source of oxygen in photosynthesis is the water molecule and not carbon dioxide ?

Answer»

Source of O₂ In Photosynthesis is water:

(i) It was previously assumed that the source of oxygen in photosynthesis was CO₂ and not H₂O molecules.

(ii) According to recent studies, oxygen is evolved from water and not from CO₂.

(iii) It was proved by the use of radioactive elements For example, the water containing heavy oxygen (H₂O₁₈) was supplied to the leaves in place of natural osygen, (H₂O₁₆).

(iv) On observation it was found that oxygen evolved in photosynthesis was heavy oxygen ¹⁸O₂ and not the natural oxygen.

(v) Now, the heavy isotope of carbon dioxide (C₁₄O₂) was supplied to the plant.

(vi) Thus, it showed that in photosynthesis, oxygen is evolved from water molecules and not from carbon dioxide.

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