A) light
B) dark
C) Both [a] and [b]
D) None of these
Correct Answer: A
Solution :
Hill's reaction/photochemical reaction takes place in presence of light in the grana portion of the chloroplast. Robin Hill (1939) first of all showed that if chloroplasts extracted from leaves of Stellaria media and Lamium album are suspended in a test tube containing suitable acceptors, eg, potassium ferrooxlate and potassium ferrecyanide, oxygen is released due to photochemical splitting of water. \[\begin{align} & \text{4F}{{\text{e}}^{\text{3+}}}\text{+2}{{\text{H}}_{\text{2}}}\text{O}\underset{{}}{\longleftrightarrow}\text{4F}{{\text{e}}^{\text{2+}}}\text{+4}{{\text{H}}^{\text{+}}}\text{+}{{\text{O}}_{\text{2}}}\uparrow \\ & _{\text{acceptor}}^{\text{Electron}}_{\text{donor}}^{\text{Electron}}_{\text{Product}}^{\text{Reduced}} \\ \end{align}\] The splitting of water during photosynthesis is called photolysis.
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