2. Life Before Photosynthesis Heterotrophs existed before autotrophs Introduction of autotrophs O2 and O3 released in atmosphere O2 allowed for aerobic respiration and O3 blocked UV rays
3. What is Photosynthesis? CO2 + H2O Sugar + O2 Process that turns sun energy into sugar. Carbon dioxide and water reacting with light: forms sugar molecules gives off oxygen Occurs in chloroplasts Light
4. Where Does It Occur? Mostly inside cells of the leaves. Within organelles called chloroplast. Chloroplast contain: Chlorophyll & carotenoid pigments Thykaloid membranes Stroma Outer & inner membranes
6. What are Chlorophyll and Carotenoids? Pigments found in chloroplast that absorb light. Chlorophyll: Reflects green light Green color of plants Carotenoids: Reflects red, orange, yellow light Fall colors
7. Inner and Outer Membrane Outer membrane Freely permeable to molecules. Inner Membrane Transporters regulate what goes in & out.
8. Thylakoid Membranes Membranes inside of chloroplast Lumen: space inside thylakoid membranes Granum: stacks of thylakoid membranes.
9. Stroma Space around thylakoid membranes Connecting thylakoids are called stromatylakoids
12. Light Reactions “Photo” part of photosynthesis Converts light to useable energy source Light energy and water to make energy ATP and NADPH Releases O2 Thylakoid membranes
13. Calvin Cycle “Synthesis” part of photosynthesis “fixes carbon” Uses CO2 to synthesize simple 3-carbon sugars Uses ATP and NADPH from light reactions Stroma
15. Photosynthesis: Review! Photosynthesis in equation and words. Understand the parts of chloroplasts Chlorophyll & carotenoids Thylakoid Stroma Inner and outer membrane Light Reactions and Calvin Cycle
16. Works Cited Raven, Peter. Biology of Plants. New York: W.H. Freeman and Co, 2005.
