Question

Chlorophyll 'a' molecule loses 1 electron from its outer orbit and gain one

• A. Negative charge
• B. Becomes neutral
• C. Positive charge
• D. None of the above

Answer 1

The correct option is C Positive charge

Chlorophyll is the molecule which gets excited on absorbing a photon. It moves rapidly to the reaction center of the photosystem I, where it transfers its extra energy to an electron, which is then expelled from the reaction center and is accepted by the first member of a chain of electron carriers and ultimately reaches $NAD{P}^{+}$, reducing it to NADPH. The reaction center has lost an electron and this "electron hole" is filled by stripping electrons from water, which leaves hydrogen ion ($H^{+}$) and molecular oxygen ($O_2$). The pathway of electrons from water to $NAD{P}^{+}$ has "Z" shape when diagrammed and is referred to as the Z-Scheme. So, the correct answer option C.