Which process is most directly driven by light energy?
(a) creation of a ph gradient by pumping protons across the thylakoid membrane
(b) reduction of nadp+ molecules
(c) transfer of energy from pigment molecule to pigment molecule
(d) atp synthesis

C

Explanation:

The energy from sunlight is used to split water molecule into H+ and O- and the emanating electron used to replace the lost electron at the reactive center of the Photosystem I & II. The lost electron is a high energy electron that is transferred from pigment to pigment in the Photosystem. As it does, its energy is harnessed and used to pump H+ protons into the lumen of the thylakoid from the stroma (creating a proton motive force that will be used to make ATPs). Ultimately this electron will then reduce NADP to NADPH.

The process that is most directly driven by light energy is ; ( C ) Transfer of energy from pigment molecule to pigment molecule

The light energy derived from the sunlight or a corresponding light source splits the H⁺ and O⁻ contained in water molecules. The split O⁻ replaces the electron which is lost at the center of photosystem I and II.

The lost electron at the reactive center contains energy while it is been transferred from one pigment molecule to another pigment molecule and this driven directly by the light energy.

Hence we can conclude that the process that is most directly driven by light energy is Transfer of energy from pigment molecule to pigment molecule.

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