Sunlight is the source of energy for photosynthesis, and the first set of reactions which begin the process requires light – thus the name, "Light Reactions", or Light-dependent Reactions.
(Sunlight; is; the source of energy for photosynthesis) (reactions; begin; the process) (the first set of reactions; requires; light) (Sunlight; is the source of; energy)
Sunlight reactions the first set of reactions Sunlight
is begin requires is the source of
the source of energy for photosynthesis
the process
light
energy