First slide

Early Experiments

Question

Which of the following type of oxygen gas will be released on providing heavy water (H₂O¹⁸) to a photosynthetic system?

Easy

A

Oxygen gas containing O¹⁸ atoms
B

Oxygen gas containing O¹⁶ atoms
C

Oxygen gas containing O³² atoms
D

Oxygen gas containing O⁶⁴ atoms

Solution

During photosynthesis, water molecules undergo photolysis and release oxygen gas, electrons and protons in the thylakoid lumen. When water molecules provided in the medium are heavy then released oxygen will also be heavy (O¹⁸).

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