6.11: photosynthesis mechanism

State in which part  of the chloroplast do the following reactions occur?

(i)     light reaction …………> granum

(ii) dark reaction …………> stroma                                             

In which part of the chloroplast could the chlorophyll be found? ------------> granum

(i) Ligt Reaction

                                    Light energy                            H⁺ + OH^-

       (ii) water   -----------------------------> hydrogen ion + hydroxyl ion

                                    Chlorophyll

 

 Light energy absorbed by the chlorophyll for Generation of ATP and

 

photolysis of water   to produce hydrogen atoms + oxygen (released to atmosphere)

  

                     

ii)  Dark reaction does not required light  occurs at the stroma of the chloroplast

during daytime

                                carbon dioxide            + hydrogen ------------> glucose C₆H₁₂O_{6  -------------------> starch}                          

           C0₂                          +   H

 

The dark reaction is catalysed by enzymes     which are sensitive to low or high temperature.