II. Photosynthesis

Review of plant cell Have cell walls and chloroplasts. Chloroplasts are site of photosynthesis

A. What it is… Plants use sunlight to produce sugar Equation: 6H2O + 6CO2  C6H12O6+ 6O2 (glucose)

Chloroplasts contain green pigment called chlorophyll 3. How it works… Chloroplasts contain green pigment called chlorophyll Absorbs blue, violet & red light (energy) from sunlight

B. Photosynthesis occurs in 2 parts

1. Light Reaction Light (energy) absorbed by chlorophyll is used to split H2O into H and O atoms ATP is made Oxygen is a “waste product” Occurs in the thylakoids

2. Dark Reaction (Calvin Cycle) Using ATP, H atoms from part 1 combine with CO2 to make glucose (C6H12O6). Occurs in the stroma

B H E A F C G D

Chloroplast H2 O CO2 LIGHT Stroma Thylakoid Sugars O2