Assertion (A) : The energy requirement for the formation of one hexose molecule is more in Chlorella than in sugar cane.
Reason (R) : The formation of phosphoenol pyruvic acid from pyruvic acid requires two ATP molecules.

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A is true but R is false

Both A and R are true and R is not the correct explanation of A

Both A and R are true and R is the correct explanation of A

A is false but R is true

answer is D.

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Detailed Solution

Assertion (A) is false. Chlorella follows C₃ pathway only and sugar cane is a $C_{4}$ plant. Sugarcane requires 12 ATP extra for fixation of one glucose molecule as compared to $C_{3}$ plant ( 18 ATP in bundle sheath cell for calvin cycle and 12 ATP in mesophyll cell for regeneration of PEP). So total number of ATP required for formation of one hexose in C3 plants is 18 and in C4 plants 30.

Reason (R) is true. The formation of phosphoenol pyruvic acid from pyruvic acid requires two ATP molecules.

A is false but R is true.

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