Assertion (A) : Each glucose molecule synthesized in C₄ plants has more amount of energy than each glucose molecule synthesized in C₃ plants
Reason ( R) : The synthesis of each glucose molecule in C₄ plants requires 12 ATP molecules more than that of synthesized C₃ plants

Assertion (A) is false -Amount of energy stored in glucose synthesised in C3 plants and in C4 plants is same , but amount energy required for synthesis of glucose in C3 plants and C4 plants different .

Reason ( R) is true - number of ATP required for synthesis of glucose in C3 plants -18 ATP,

number of ATP required for synthesis of glucose in C4 plants -30 ATP

12 extra ATP required for synthesis of glucose in C4 plants , these 12ATP are utilised in regeneration of PEP.