C ₄ plants have better productivity because

Step-by-step solution

Presence of photorespiration is considered as a wasteful and energy consuming process in crop plants which ultimately leads to reduction in final yield of crops. It is estimated that during C ₃ photosynthesis, upto 50 % of the CO ₂ fixed may have to pass through photorespiratory process, thereby resulting in considerable decrease in photosynthetic productivity. In C ₃ plants, there is some loss of photosynthetic activity on account of photorespiration which is absent in C ₄ plants and hence they have better product