Question

For the same amount of $C{O}_2$ fixed a $C_4$ plant in comparison with a $C_3$ plant loses only

• A. Less than half amount of water
• B. Equal amount of water
• C. Double amount of water
• D. None of the above

Answer 1

The correct option is A Less than half amount of water

$C_4$ plants have a competitive advantage over plants possessing the more common $C_3$ carbon fixation pathway under conditions of drought, high temperatures, and nitrogen or $C{O}_2$ limitation. $C_4$ plants have special Kranz anatomy which leads to the reduction in loss of water.

So, the correct answer is option A.