Mineral NutritionHard

Question

Through the use of oxygen-18 (heavy oxgen), scienctists have found that the oxgen released during photosynthesis comes from molecules of

Options

A.carbondioxide
B.water
C.glucose
D.chlorophyll

Solution

Oxygen which is libereted during photosynthesis comes from water. In photosynthesis, the light energy is captured by chrophyll in the choroplasts in plant leaves. This energy is used to split water in a process called photolysis.
      4H2O ⇋ 4H+ + 4OH
      4OH 2H2O + O2 ↑ + 4e-

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