1. Photosynthesis Using light to make food..

2. 8-1 Energy and life Energy – the ability to do work In living things it is needed to move and also to build new proteins and amino acids.

3. Where does energy that living things need come from?

4. Autotroph "self-feeding“ –any organism that makes its own food without eating decomposing absorbing other organisms or organic molecules. Auto – self Troph – to feed

5. Photosynthetic autotrophs "feed" themselves with light energy – include plants –photosynthetic protists (algae) – photosynthetic bacteria Cyanobacteria Algae & bacteria

6. Heterotrophs Get their food from eating autotrophs or from eating other heterotrophs Hetero - other

7. Chemical Energy and ATP Energy comes in many forms (heat, light, electricity) It can be stored in molecules such as carbohydrates and lipids The chemical fuel for cells though is ATP Adenosine Triphosphate Tri- three

8. This is how it works Energy from food is used to convert ADP to ATP. As a result of adding a phosphate a small amount of energy is stored. Di - two

9. Using biochemical energy This energy can be used to do all kinds of cell work Active transport –Pumps –Motor Proteins –Synthesis of proteins and nucleic acids

10. 8-2 Photosynthesis Overview During Photosynthesis light energy is used to convert water and carbon dioxide into sugar(glucose) and oxygen Photo – Syn – to put together

13. Chlorophyll green pigment that absorbs light energy located in the membranes of chloroplasts –thylakoids in stacks, called grana –In stroma carbon dioxide is built into sugars.

14. The absorption spectrum White light is composed of the colors of the rainbow ROYGBIV

15. 8-3 The reactions of Photosynthesis

16. Step 1 The light energy strikes the leaf – passes into the leaf –hits a chloroplast inside an individual cell.

17. Step 2 light energy enters the chloroplasts – captured by the chlorophyll inside a grana.

18. Step 3 Inside the grana -part of the energy is used to split water into hydrogen and oxygen

19. Step 4 Releasing of excess (waste) –As oxygen into the air. Stomata of cactus plant

20. Step 5 hydrogen –taken to the stroma along with the grana’s remaining light energy.

21. Step 6 Carbon dioxide enters the leaf –passes into the chloroplast.

22. Step 7 Stroma the remaining light energy –used to combine hydrogen and carbon dioxide making Carbohydrates.

23. Step 8 The energy rich carbohydrates are carried to the plant’s cells.

24. Step 9 Energy rich carbohydrates – used by the plants cells to drive all its life processes –Holds energy in chemical bonds

25. Summary of Photosynthesis

26. Photosynthesis and Respiration