A photon has just hit the light harvesting complex of the reaction center of pho
ID: 100784 • Letter: A
Question
A photon has just hit the light harvesting complex of the reaction center of photosystem II and an electron has been excited from P680. Follow up this electron and give an overview of light reaction in producing the ATP and NADPH required for the next stage of photosynthesis that is Calvin cycle in producing sugar as the final product of photosynthesis. In your writing, you do not want to miss stating how water is used and the oxygen we breathe is produced. The two diagrams below should dictate your writing. Please make your writing brief but complete to earn points. Light Reaction: ______________ Calvin Cycle: _____________Explanation / Answer
The Light Reaction is the first stage of Photosynthesis.It is also called as Light dependent reaction.It commence with breaking of bonds in H2O to make O2,Free electrons and Hydrogen ion (H+).Free electrons go to Photosystem 2 where light energy is absorbed and electrons get this High energy.This happens in Thylakoid membrane.Then the electrons move along the Electron Transport Chain(ETC) and provide energy to H+ to move it from the Stroma to the Thylakoid space.Photosystem 1 absorbs Light Energy then to energize the traveling electron and then in Stroma electrons get accepted by NADP+ with Hydrogen ion(produced earlier) to synthesize NADPH.Hydrogen then passively moves from the Thylakoid space to Stroma through ATP synthase and production of ATP takes place.
In Calvin Cycle CO2 fixation occures which means that it combines with RuBP with the help of RuBisCO followed by hydrolysis of ATP and NADPH to release Energy and use this energy to form new bonds subsequently producing G3P,the precursor of Glucose.Later on in coupled reactions Glucose is produced from G3P.
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