Question

A photosynthesising plant is releasing ${}^{18}O$ more than the normal. The plant must have been supplied with

• A. $O_3$
• B. $H_{2}O$ with ${}^{18}O$
• C. $C{O}_2$ with ${}^{18}O$
• D. $C_6{H}_{12}{O}_6$ with ${}^{18}O$

Answer 1

Answer: (B)

$H_{2}O$ with ${}^{18}O$

The splitting of water is responsible for the release of oxygen as it compensates the electron deficiency of PS II because it transfers its electrons to PS I in the Z scheme. If the oxygen release is ${}^{18}O$ it means the water lant absorb has it.

So the correct option is 'H${}_2$2O with ${}^{18}O$'.