BIG PICTURE Stomata Mesophyll tissue Mesophyll cell chloroplast

BIG PICTURE

Stomata Mesophyll tissue Mesophyll cell chloroplast

Grana (stack of thylakoids) Stroma (solution)

Chloroplasts

Why are leaves GREEN? • Sunlight = White light and contains all colors of the spectrum • Leaves contain pigments chlorophyll a & b and carotenoids • Chlorophylls absorb all colors besides green = reflect green

Why do leaves change in the fall? • Leaves loose their chlorophyll as they die • Carotenoids (pigment) reflect yellows, oranges, greens

Pigments

LIGHT REACTION: Electron Transport (draw on yellow paper)

Figure 8 -10 Light-Dependent Reactions Section 8 -3 Photosystem II Hydrogen Ion Movement Chloroplast ATP synthase Inner Thylakoid Space Thylakoid Membrane Stroma Electron Transport Chain Photosystem I ATP Formation

1. What molecule is split at photosystem II? 2. What three products get made when the molecule is split in PS II? 3. Explain the pathway of electrons from PS II to PS I (be sure to state the final molecule that finally accepts the electron at the end of the pathway). 4. Explain how the plant makes ATP.

Calvin Cycle: (draw on colored paper)

Figure 8 -11 Calvin Cycle Section 8 -3 CO 2 Enters the Cycle Energy Input Chlorop. Iast 5 -Carbon Molecules Regenerated 6 -Carbon Sugar Produced Sugars and other compounds

Stomata Mesophyll tissue Mesophyll cell chloroplast

Calvin Cycle – not effective as is so…alternative pathways