8-2 Photosynthesis Photo means light Synthesis means putting together INTERACTIVE: pgs204-207

Investigating Photosynthesis Van Helmont - 1643 Concluded trees gain mass from water not the soil Priestley - 1771 Discovers that plants release oxygen Ingenhousz - 1779 Determines plants need light to produce oxygen

The Photosynthesis Equation OIL RIG Oxidation is Loss Reduction is Gain

Photosynthesis Uses energy of sunlight to convert water and carbon dioxide into high energy sugars and oxygen. 2 Parts: Light Dependent Reactions and Calvin cycle

Light and Pigments Plants absorb light energy with pigment molecules Energy is transferred to electrons in the pigment raising the overall energy level The primary pigment in green plants is Chlorophyll Type a- blue-violet and red light Type b- blue and red Accessory pigments red and orange- carotene

Why are leaves green?