Question

How many carboxylation and decarboxylation occurs in C4 plants respectively during light independent phase?
(1) 1, 1 (2) 2, 1 (3) 1, 2 (4) 2, 2


answer is 2nd option please elaborate

Answer 1

Explanation:

Carboxylation means Adding of CO2

Decarboxylation means eliminating CO2

Decarboxylation occurs twice and carboxylation occurs once

DECARBOXYLATION -

1] In mesophyll at initial stage during conversion of CO2 to Phospho Enol Pyruvate

2]. In Calvin cycle During conversion of Rubulose bi phosphate here CO2 is fixed by RuBiSco i.e, Decarboxylation and converted to 6 carbon containing unstable compound

CARBOXYLATION - In Bundle sheath Malic acid is converted to 3 Carbon containing compound there CO2 is released

Thank you