Acetyle co enzyme
The light reaction produces ATP and NADPH, which are needed to fuel the dark reaction. The dark reaction (Calvin Cycle) uses the ATP and NADPH produced in the light reaction to fuel the conversion of carbon dioxide into glucose. In essence, the light reaction provides the energy source that drives the dark reaction.
The end product of the light reactions is ATP and NADPH, which are then used in the dark reactions to produce glucose through the Calvin cycle.
The light reaction makes two substances needed by the dark reaction: ATP and NAPH. As long as these two substances are available the dark reaction can continue, even in the absence of light. However when they run out more light is needed to replace them.
The inputs of the Dark Reaction are NADPH, ATP, and CO2. The NADPH and ATP, which were produced in the Light Reactions, fix the carbon into a carbohydrate such as glucose. Enzymes are also needed for the Dark Reaction to take place. One such enzyme is Rubisco, which interacts with CO2 and RuBP in the first step of the Dark Reaction.
Because energy rich compounds needed in dark reaction are produced during light reactions.
They are used to produce sugar during the dark reaction
The product of the dark reaction in photosynthesis is glucose.
ATP and NADH2
It is the light reaction. Then they moves to dark reaction
ATP and NADPH
why light reaction of photosynthesis is essential before the dark reaction can procced?
There must be a light reaction first before dark reaction. This is so that there is something to be compared.