Question

The source of oxygen evolved during photosynthesis is:

• A. $H_{2}O$
• B. $C_6{H}_{12}{O}_6$
• C. $C{O}_2$
• D. $n\left(C{H}_{2}O\right)$.

Answer 1

The correct option is A $H_{2}O$

In the light reaction, the splitting of water occurs. The protons and oxygen formed by splitting of water are released within the lumen of the thylakoid. The oxygen produced is released as one of the net products of photosynthesis.

So, the correct option is 'H${}_2$O'