Photosynthesis Question 61

61. $C_4$ plants are more efficient in photosynthesis than $C_3$ plants due to:

[2010]

(a) Higher leaf area

(b) Presence of larger number of chloroplasts in the leaf cells

(c) Presence of thin cuticle

(d) Lower rate of photorespiration

Show Answer

Answer : d

Hints & Solution

(d) $C_4$ plants are more efficient in photosynthesis than $C_3$ plants due to photorespiration. Photorespiration is an inhibitory process that decreases the rate of photosynthesis. It is absent in $C_4$ plants and present only in $C_3$ plants.