Photosynthesis Light + 6CO 2 + 6H 2 0 → C 6 H 12 O 6 + 6O 2 How does this relate to respiration?

The Chloroplast

Figure 10.4 An overview of photosynthesis: cooperation of the light reactions and the Calvin cycle (Layer 1)

Figure 10.4 An overview of photosynthesis: cooperation of the light reactions and the Calvin cycle (Layer 2)

Figure 10.4 An overview of photosynthesis: cooperation of the light reactions and the Calvin cycle (Layer 3)

The Light Reaction I mean…The Light Dependent Reaction. Purpose: To make energy to for the Light Independent Reaction. Sizemore’s snazzy diagram!!

Figure How noncyclic electron flow during the light reactions generates ATP and NADPH (Layer 2)

Figure How noncyclic electron flow during the light reactions generates ATP and NADPH (Layer 3)

Figure How noncyclic electron flow during the light reactions generates ATP and NADPH (Layer 4)

Figure How noncyclic electron flow during the light reactions generates ATP and NADPH (Layer 5)

Figure The light reactions and chemiosmosis: the organization of the thylakoid membrane

Figure Comparison of chemiosmosis in mitochondria and chloroplasts

The Light Independent Reaction  Purpose: To use the energy produced in the LDR to make glucose.  Another Snazzy Diagram!

Figure The Calvin cycle (Layer 1)

Figure The Calvin cycle (Layer 2)

Figure The Calvin cycle (Layer 3)

Cyclic Electron Flow Some photosynthetic bacteria have PSI and no PSII. Makes them ATP.

What happens in Hot Weather?! –Most plants close their stomata in hot weather. –As CO 2 conc. Decreases,O 2 increases –Rubisco grabs O 2 instead to produce 2-C compound. –Mitochondria breaks down 2-C compound to CO 2 –ATP consumed in this process and no food is produced. Photorespiration: Occurs in the light and consumes O 2

Metabolic adaptations to Hot, Arid climates  Two Adaptations: –1. C 4 Plants: First product is a 4-C molecule  Sugarcane, corn and grasses. –2. CAM Plants: Crassulacean Acid Metabolism.  Succulants, cacti, and pineapples

Figure C 4 leaf anatomy and the C 4 pathway

 PEP Carboxylase has a very high affinity to CO2.  Transport of CO2 deep in the leaf maintains high concentration gradient at surface & keeps CO2 levels high in the Bundle sheath cells.

CAM Plants  Open stomata during the night and close them during the day.

Figure C 4 and CAM photosynthesis compared

Figure A review of photosynthesis