Question

Loss of water in $C_4$ plants as compared to $C_3$ plants for the same amount of $C{O}_2$ fixed is

• A. Double
• B. One third
• C. One fourth
• D. Half

Answer 1

The correct option is B One third

A) The loss of water in $C_4$ plants is much lesser than the loss of water in $C_3$ plants.

B) The loss of water in $C_4$ plants is reduced as they do not need to keep their stomata open for a long time to take in carbon dioxide due to the efficient $C_4$ pathway and hence, reduce the loss of water through transpiration by one third.

C) The loss of water in $C_4$ plants is one third that of $C_3$ plants.

D) The loss of water is one third.

So the correct answer is 'One third'.