The Light-dependent Stage:

LIGHT DEPENDENT STAGE = OCCURS IN GRANA

It involved the direct use of light energy. This stage consists of...

• light harvesting at the photosystems
• photolysis of water
• photophosphorylation - the production of ATP in the prescence of light
• the formation of reduced NADP
• oxygen is produced

Two Types of Photosystem: 

• In photosystem I, the pigment at the primary reaction centre is a type of chlorophyll a, which has a peak absorption of red light of wavelength 700nm.
• In photosystem II, the pigment at the primary reaction centre is also a type of chlorophyll a, but this has a peak absorption of red light of wavelength 680nm. 

The Role of Water:

In…