Photosynthesis
Plants
are able to convert water and carbon dioxide to be their food, organic
compound, especially sugar by using sunlight energy. The process of converting
is called photosynthesis. Photosynthesis involves two reactions: light reaction
and light-independent reaction.
The
first reaction is the light reaction which is also called light-dependent
reaction. This reaction occurs in thylakoid membrane of the chloroplasts. It uses
light energy to synthesize ATP and NADPH,
the form of energy that is ready to be used by plants and humans. In this case,
plants use ATP and NADPH to provide energy for the next reaction. The equation
for the light-dependent reactions
is:
2 H2O
+ 2 NADP+ + 3 ADP + 3 Pi + light → 2 NADPH + 2 H+
+ 3 ATP + O2










