What is photosynthesis?
The synthesis of complex organic compounds from simple organic compounds like water and carbondioxide by green plants in the presence of chlorophyll using sunlight is called photosynthesis.
6CO2+ 6H2O CHO+6O
What is dark reaction? Where does it occur?
Dark reaction, also called calvin cycle is an anabolic process in which 3-Carbon sugar called glyceraldehyde-3-phospate is produced. This is a light independent process.