Botany - Photosynthesis in Higher Plants Question with Solution | TestHub

$C_4$ plants are more efficient than $C_3$ plants because they have little photorespiration while in $C_3$ plants more than half of photosynthetic carbon get lost in photorespiration. ${\mathrm{C}}_4$ plants are more efficient in picking up ${\mathrm{CO}}_2$, even in low ${\mathrm{CO}}_2$ concentration because of high affinity of ${\mathrm{CO}}_2$ with PEP (phosphoenol pyruvic acid).