Photosynthesis is a biological process that converts light energy into chemical energy. This chemical energy is stored in organic compounds and can be used to fuel cellular activities. Photosynthesis is largely responsible for maintaining the oxygen content of the Earth's atmosphere.

1. PHOTOSYNTHESIS IN HIGHER PLANTS
chloroplast
absorption spectrum of
chlorophyll a, b and
the carotenoids
action spectrum of photosynthesis
action spectrum of
photosynthesis
superimposed on absorption
spectrum of chlorophyll a

2. The light harvesting complex
Z scheme of light reaction

3. Cyclic photophosphorylation
ATP synthesis through chemiosmosis

4. The Calvin cycle

5. Hatch and Slack Pathway