2007-03-26 19:30:53 · 3 answers · asked by noni 1 in Science & Mathematics ➔ Biology
Nothing continues for ever. In the case of photosynthesis the products of the light reaction are necessary for the Calvin cycle to produce sugar. If these products are no longer available then the Calvin cycle will shut down.
ATP and NADPH produced by the light reactions are used in the Calvin cycle to reduce carbon dioxide to sugar.
Carbon enters the Calvin cycle and leaves as sugar.
ATP is the energy source, while NADPH is the reducing agent that adds high energy electrons to form sugar.
These reactions require 3 ATP molecules.
2007-03-27 01:42:59 · answer #1 · answered by ATP-Man 7 · 0⤊ 0⤋
the dark reactions follow the light reactions...hence when there is no light...i t will not initiate!and even if it does..it will continue only till the time it the products of the light reaction are available.following the exhaust of the reactants(products of light reaction)the dark reaction cannot continue.(refer to the Calvin Benson cycle:-
http://academic.brooklyn.cuny.edu/biology/bio4fv/page/photo-overview1478.JPG
2007-03-26 20:30:19 · answer #2 · answered by diavolo moi 2 · 2⤊ 0⤋
ON one hand, it would seem so, since dark reactions are not dependant upon light for their properties. On the other, the laws of any reactions are strictly governed by observability, and the absence of light may prohibit the life of any creature, such as ourselves, who may exist to take such measurements.
2007-03-26 19:41:03 · answer #3 · answered by EzminJ 2 · 0⤊ 2⤋