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

Options

A. If both Assertion & Reason are true and the reason is the correct explanation of the assertion.
B. It both Assertion & Reason are true but the reason is not the correct explanation of the assertion.
C. If Assertion is true statement but Reason is false.
D. It both Assertion and Reason are false statements.

Answer

d

Explanation

`C_(4)` plants are those plants that produce, `C_(4)` compound like malic acid or asparti acid as the first stable compound of `CO_(2)` fixation cycle, eg. Maize, sugar cane etc. Theses plants can grow in dense, ropical, forests were 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. The `C_(4)` pathway shows 2 carboxylation reactions one in mesophyll chloroplasts and the other in bundle sheath. Chloroplasts `CO_(2)` acceptor is PEP and not RuBP and PEP carboxylases is the key enzyem.