Question

Select the correct option:

Consider following statements with respect to the $C_4$ pathway and select the correct ones.
(i) Mesophyll cells possess both RuBisCO and PEPcase enzymes.
(ii)Initial $C{O}_2$ fixation occurs in mesophyll cells.
(iii)Final $C{O}_2$ fixation occurs in bundle sheath cells.

• A. (i) and (ii)
• B. (ii) and (iii)
• C. (i) and (iii)
• D. (i),(ii) and (iii)

Answer 1

The correct option is B (ii) and (iii)

$C_4$ pathway occurs in plants that grow in challenging environmental conditions like desserts,high temperatures etc. So, to efficiently fix $C{O}_2$ and prevent photorespiration initially $C{O}_2$ is fixed in the mesophyll cell by a compound PhosphoEnolPyruvate forming 4C OxaloAceticAcid, which is the transported into the bundle sheath cells, decarboxylated and acted upon by RuBisCO through the $C_3$ pathway.

So, the correct answer is '(ii) and (iii)'