Food production of plants occurs in the
chloroplasts. Its overall process can be understood as two closely linked
reaction sets. The light-independent reactions take place in the thylakoid
membranes whereby NADPH is produced from electron transport and hydrogen ion
gradient
is formed across the membrane of
thylakoid which drives ATP synthesis by the process called chemiosmosis. Light-
independent reactions use ATP and NADPH.
The driving force of photosynthesis is light absorption. The wavelengths
only of light absorbed by the photosystems can be used to drive photosynthesis.
