· Photosynthesis is the synthesis of carbohydrates by green plants in presence of light using CO 2 and H 2 O. · Anabolic (Constructive process or Increase in dry weight) · Oxidation of H 2 O into O 2 . · Source of 'H' in Glucose is H 2 O · Source of oxygen in Glucose is CO 2 . · Reduction of CO 2 into glucose (C 6 H 12 O 6 ). · Volume of CO 2 utilized is equal to the volume of Oxygen released. · By the process of photosynthesis solar energy (ultimate source of energy for all living beings) is trapped by autotrophic organisms and stored in the form of chemical energy. · Only 0.2% of the light falling on the earth is utilized by photosynthesis organisms. Photosynthetic Pigments 1. Chlorophyll- Chl.a, Chl.b, Chl.c etc. 2. Carotenoids (a) Carotene- Orange coloured (b) Xanthophylls- Yellow coloured 3. Phycobilins (a) Phycoerythrin - red pigment (b) Phycocyanin- blue pigment. · Primary photosynthetic p...