Well the first photosynthesis was at the start of time because otherwise we wouldn't have any air and therefore not be alive. So to say is simply photosynthesis has been around forever just like trees.
This is not correct at all.....completely false.
i think the first thing to photosynthesise was bacteria, it may be called cyanobacteria, i am not completely sure. but no, things have not been photosynthesising forever as the temperature did not cool down enough for millions or billions of years, and put it this way, humans did not evolve for billions of years, so we werent made when the earth was "formed"
The first molecule to provide electrons for photosynthesis is water. Water is split into oxygen, protons, and electrons during the light-dependent reactions of photosynthesis. These electrons are then used to drive the production of ATP and NADPH, which are needed for the Calvin cycle to convert carbon dioxide into glucose.
The light reactants of photosynthesis, including light energy and water, are transformed into chemical energy in the form of ATP and NADPH. These molecules are essential for driving the Calvin cycle, the part of photosynthesis that produces glucose from carbon dioxide. Without the light reactants, the Calvin cycle cannot proceed and glucose production is limited.
The Calvin Cycle is dependent on the first stage of photosynthesis because it relies on the products of the light-dependent reactions, such as ATP and NADPH, to power the conversion of carbon dioxide into glucose.
Cellular respiration likely evolved before photosynthesis. Early prokaryotic organisms likely developed cellular respiration to generate energy from organic molecules. Photosynthesis evolved later in some prokaryotic organisms as a way to use sunlight to make energy.
High oxygen levels inhibit photosynthesis because oxygen competes with carbon dioxide for the active site on the enzyme RuBisCO, which is essential for the first step of photosynthesis. This competition reduces the efficiency of carbon dioxide fixation and ultimately hinders the overall process of photosynthesis.
photosynthesis
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Light Dependant Reactions
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The first simple food prepared in the process of photosynthesis is glucose. Glucose is synthesized from carbon dioxide and water using energy from sunlight during the light-dependent reactions of photosynthesis.
light dependant reactions
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Photosynthesis
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PGA is the first stable product of The Calvin Cycle of photosynthesis.