6CO2+6H2O+Energy=C6H12O6+O2
This chemical equation for photosynthesis is perhaps one of the most important chemical equations out there, as it is this peculiar combination of products & the subsequent reaction that led to the origins of Aerobic life on the planet.
Earth was formed Approximately 4.5 billion years ago. At that point there was little or no freely available oxygen in gas with the only available gases being nitrogen, helium, hydrogen & methane. At this point only anaerobic life could grow & sustain on the planet which was mostly in the form of algae & bacteria. Of these anaerobic life forms one such life form was Cyanobacteria.Cyano means Blue. This is in reference to the bluish green tinge possessed by this bacteria owing to its chlorophyll. Cyanobacteria, a form of algae had special chlorophyll properties, which was particularly capable of trapping & using sunlight better than other algae. This sunlight when trapped reacted with the CO2 & H2O which were present in the algae. This is the product side of the equation for photosynthesis- 6CO2+6H2O+Energy. The reaction of the combination of these products was twofold. 1) Ready availability of glucose for cyanobacteria as an energy source for anaerobic respiration. 2) Production of O2 as a metabolic waste which was eventually released or discarded out by Cyanobacteria just like humans today expel CO2.
Thus the reaction = C6H12O6+O2. Now initially the level of O2 in the atmosphere was 10 mmHg. It was Something but certainly not sufficient to birth & sustain aerobic life on the planet. But around 2 billion years ago, in the paleoproterozoic era, there was a phenomenon known as 'The great oxidation' event where the O2 level reached 200 mmHg in the atmosphere. And this greatly supported the birth & the rise of aerobic creatures & eventually us humans on the planet. But this event also led to the extinction of many anaerobic animals on the planet for whom Oxygen was a deadly element.
In recent times, a specific variant of cyanobacteria known as proclorococcus has been discovered which is considered to be one of the major contributors of oxygen to the planet. And while there are other sources of breathable oxygen on the planet, Cyanobacteria & its proclorococcus variant are considered major contributors of Oxygen on the planet.
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