Question

Two plants A and B are supplied with CO${}_2$ with H${}_2$O${}^{18}$ and CO${}_2^{18}$ with H${}_{2}O$ respectively. Which of the following plant releases O${}^{18}$ type oxygen in photosynthesis?

• A. A plant
• B. B plant
• C. Both A and B
• D. None of the above

Answer 1

The correct option is A A plant

During photosynthesis, oxygen evolved by the hydrolysis of water. If $H_2{O}^{18}$ is used in 'A' plant then it becomes true that $O^{18}$ type of oxygen from 'A' plant during photosynthesis. This method of tracking can be done with the help of radio isotoping, which cross confirms the result.

So, the correct answer is option A.