Assertion: Photosynthetically C₄ plants are less efficient than C3 plants.

Reason: The operation of C₄ pathway requires the involvement of only bundle-sheath cells.

• If both assertion and reason are true and reason is the correct explanation of assertion

• If both assertion and reason are true but reason is not the correct explanation of assertion

• If assertion is true but reason is falsen

• If both assertion and reason are false.

D.

If both assertion and reason are false.

C₄ plants are those plants that produce C₄ compound like malic acid or aspartic acid as the first stable compound of CO, fixation cycle, eg. maize. sugar cane etc. These plants can grow in dense tropical, forests where there is poor supply of CO₂ because there is internal supply of CO₂ Also photorespiration is negligible or absent in these plants. So, they are photosynthetically more efficient than C₃ plants. These plants show a special type of leaf anatomy called Kranz anatomy. C₄ plants uses mesophyll cells and bundle sheath cells in the outer part of their leaves. The C₄ pathway shows 2 carboxylation reactions one in mesophyll chloroplast and the other in bundle sheath. Chloroplasts- CO₂ acceptor is PEP and not RuBP and PEP carboxylase is the key enzyme.