nutrition in plants

i) In light reaction, the absorbed light energy causes the emission of energised electrons from chlorophyll. Some of these electrons can release their energy in a controlled fashion synthesising ATP. Other electrons are carried into the Dark Stage. Thus this process is important in driving the steps of photosynthesis.

 

 

 

ii) Photolysis of water produces oxygen molecules, hydrogen ions and electrons. These electrons are transferred to the positively-charged chlorophyll. The reduced hydrogen acceptor makes its way to the second stage of photosynthesis, the Calvin cycle. Photolysis of water results in the generation of free oxygen. Thus oxygen is returned to the atmosphere.