Asserton : One molecule of `CO_(2)` is fixed to give 686 kcal in photosynthesis.
Reason : To from a hoxose, six molecules of `CO_(2)` are fixed.

Options

A. If both the asserition and the reasion are true and the reason is a correct explanation of the assertion
B. If both the assertion and reasoni s not a correct ecplanation of the assertio
C. If the assertion is true but the reason is false
D. If the assertion is false but reason is true

Answer

E

Explanation

The overall equation of photosynthesis is
`CO_(2) + 2H_(2)O + n(hv) to (CH_(2)O) + H_(2)O + O_(2)`.
The standard free-energy change for the synthesis of hexose from `CO_(2)` and `H_(2)O` is `Delta G^(@)` = +686 kcal. As six molecules of `CO_(2)` is involved to form one molecule of hexose, the energy input per `CO_(2)` molecule will be 114 kcal.