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Plants are one of the most interesting living creatures promoting the sustainability of animals' lives.
Plants are autographs and transducer the light energy of sun to chemical energy that is stored in the bonds of food.
The amazing process in which food is synthesized by plants (mainly) using inorganic constituents in the presence of sunlight.
Inorganic constituents include Carbon dioxide, water, hydrogen sulfide, etc...
Photosynthesis hence basically include two steps
A. Utilizing and storing the energy of the sun (therefore photo)
B. Synthesis of organic molecules
The former step of the utilization of sunlight energy to produce energy-storing compounds like ATP and NADPH, and then using them to carry out synthesis.
The light reaction involves a light Harvesting complex, which itself includes:
Photosystem I was discovered earlier, and thus named PS I.
Absorption peak observed at 700 nm. (Far red radiations)
P700 when comes in contact with radiation whose wavelength is less than 700 nm it gets activated (as lower wavelength have higher energy).
It forms P700+ and loses one electron due to photoemission.
This electrons enters a transport ⛓️ chain and continuously synthesize out energy 🔋 storing compounds.
Let's directly jump to point here
When electron doesn't return to it's origin.
In PSI electrons are supplied by PSII. From P700 electron is emitted which is accepted by the IronSulphur complex.
Then transferred to ferrodoxin. And ultimately then transferred to the NADP reductase. Which also removes H+ ion from the stroma and produce NADP.
PSI functions at low energy (high wavelength). It supplies its electron to FeS.
Then it goes to Plastquinone and forms reduced Plastoquinone.
Then electron shifted to Cytochrome b6f and and releases H+ ion inside the lumen.
Finally, electron reaches plastocyanin and then back to PSI.
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