Assertion : Photosynthetically C₄ plants are less efficient than C ₃ plants. Reason : The operation of C ₄ pathway requires the involvement of only bundle-sheath cells.

Step-by-step solution

C ₄ plants are those plants that produce C ₄ compound like malic acid or aspartic acid as the first stable compound of CO ₂ fixation cycle, eg. maize, sugar cane etc. These plants can grow in dense tropical, forests where there is poor supply of CO ₂ because there is internal supply of CO ₂ . Also photorespiration is negligible or absent in these plants. So, they are photosynthetically more efficient than C ₃ plants. These plants show a special type of leaf anatomy called Kranz anatomy. C ₄ plants uses mesophyll ce