Question

In an experiment setup, a group of $C_3$ and a group of $C_4$ plants were grown in an environment with double the amount of $C{O}_2$ concentration. Which group of plants would grow better and be more water efficient?

• A. $C_3$ plants will be better than $C_4$ plants
• B. $C_4$ plants will be better than plants $C_3$
• C. Both $C_3$ and $C_4$ plants will show equal growth
• D. None of these

Answer 1

The correct option is A $C_3$ plants will be better than $C_4$ plants

Option 'A' is correct

With double the mount $C{O}_2$ concentration, $C_3$ plants will be better than $C_4$ plants because the carbon dioxide compensation point is low is $C_4$ cycle. In high light intensity, the rate of $C{O}_2$ evolution is high is $C_3$ plants. In the high light intensity, the rate of $C{O}_2$ evolution is low is $C_4$ plants.