3 Lesson: BIO.A.3.1 Photosynthesis

Photosynthesis takes place in chloroplast

Contain a substance called chlorophyll

Chlorophyll reflects green light giving plants their green color

Step 1: absorption of light by chlorophylls , used to break water (H₂0) -->(4H⁺ and 4 e^- and O₂)

Step 2: The electron transport leading to the reduction of NADP+ to NADPH

Step 3: Generation of ATP

Step 4: Conversion of CO₂ into carbohydrates (sugar) (Calvin Cycle or Carbon Fixation)

A CO₂ molecule combines with a five-carbon acceptor molecule, ribulose-1,5-bisphosphate (RuBP). This step makes a six-carbon compound that splits into two molecules of a three-carbon compound, 3-phosphoglyceric acid (3-PGA). This reaction is catalyzed by the enzyme RuBP carboxylase/oxygenase, or rubisco

End results is Sugar