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(A) During photosynthesis,the $O_2$ evolved is derived from the photolysis (hydrolysis) of water. Since plant $A$ is supplied with $H_2O^{18}$,the oxy

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$A$ plant

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(A) During photosynthesis,the $O_2$ evolved is derived from the photolysis (hydrolysis) of water. Since plant $A$ is supplied with $H_2O^{18}$,the oxygen released during the light-dependent reaction will be of the $O^{18}$ isotope type. Plant $B$ is supplied with $CO_2^{18}$ and normal $H_2O$,so it will release normal $O_2$ because the oxygen in $CO_2$ is incorporated into carbohydrates,not released as gas. Therefore,plant $A$ releases $O^{18}$ type oxygen.

Two plants $A$ and $B$ are supplied with $CO_2$ with $H_2O^{18}$ and $CO_2^{18}$ with $H_2O$ respectively. Which of the following plants releases $O^{18}$ type oxygen in photosynthesis?

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