Question

A plant is provided with ideal conditions for photosynthesis and supplied with isotope 14 $C{O}_2$. When the products of the process are analysed carefully, what would be the nature of products?

• A. Glucose and oxygen are labelled
• B. Oxygen is labelled, but glucose is normal
• C. Glucose and oxygen are normal
• D. Glucose is labelled, but oxygen is normal

Answer 1

The correct option is D

Glucose is labelled, but oxygen is normal

In the process of photosynthesis
$6C{O}_2+12H_{2}O\underset{Chl}{\overset{hv}{\to }}\underset{\left(Glucose\right)}{C_6{H}_{12}{O}_6}+6H_{2}O+6O_2\uparrow$
Plants manufacture glucose from $H_{2}O$ and $C{O}_2$ and oxygen gas is released. So, due to isotopic carbon of $C{O}_2$, only glucose will be labelled, but oxygen will be normal.