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  • The oxygen evolved during photosynthesis, comes from water molecules. Which one of the following pairs of elements is involved in this reaction?  

The oxygen evolved during photosynthesis, comes from water molecules. Which one of the following pairs of elements is involved in this reaction?

 

Option: 1

Magnesium and Molybdenum


Option: 2

Magnesium and Chlorine


Option: 3

Manganese and Chlorine

 


Option: 4

Manganese and Potassium


Answers (1)

best_answer

Oxygen is evolved during photosynthesis by the process of photolysis of water taking place in the membranes of grana thylakoids. The phenomenon of breaking up water into hydrogen and oxygen in the illuminated chloroplasts is called photolysis or photocatalytic splitting of water. Light energy, an oxygen evolving complex (OEC) and electron carrier are required for this process. Oxygen evolving complex is attached to the inner surface of thylakoid membrane and the enzyme has four Mn ions. Light energized changes in \mathrm{Mn} \mathrm{(Mn^{2+},Mn^{3+},Mn^{4+})} remove electrons from the \mathrm{OH-} component of water forming oxygen. Liberation of \mathrm{O_{2}} also requires two other ions, \mathrm{Ca^{2+}}\; \text{and}\; \mathrm{Cl}^{-}.

4 \mathrm{H}_2 \mathrm{O} \ldots 4 \mathrm{H}^{+}+40 \mathrm{H}^{-}

4 \mathrm{OH}^{-} \text {oxygen evolving complex } \ldots 2 \cdots \cdots\rightarrow 2 \mathrm{H}_2 \mathrm{O}+\mathrm{O}_2 \uparrow+4 \mathrm{e}^{-}

\mathrm{Mn2}+\mathrm{Ca2+\textrm {Cl }}^{-}

Hence, the correct answer is option 3.

Posted by

avinash.dongre

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