1. Biology Chapter 4.2 Photosynthesis

2. KEY CONCEPT The overall process of photosynthesis produces sugars that store chemical energy.

3. Photosynthetic organisms are producers. Producers make their own source of chemical energy. Plants use photosynthesis and are producers. Photosynthesis captures energy from sunlight to make sugars.

4. Chlorophyll is a molecule that absorbs light energy. chloroplast leaf cell leaf In plants, chlorophyll is found in organelles called chloroplasts.

5. Photosynthesis in plants occurs in chloroplasts. Photosynthesis takes place in two parts of chloroplasts. – grana (thylakoids) – stroma chloroplast stroma grana (thylakoids)

6. The light-dependent reactions capture energy from sunlight. –take place in thylakoids –water and sunlight are needed –chlorophyll absorbs energy –energy is transferred along thylakoid membrane then to light-independent reactions –oxygen is released

7. The light-independent reactions make sugars. –take place in stroma –needs carbon dioxide from atmosphere –use energy to build a sugar in a cycle of chemical reactions

8. The equation for the overall process is: 6CO 2 + 6H 2 O  C 6 H 12 O 6 + 6O 2 C 6 H 12 O 6 granum (stack of thylakoids) thylakoid sunlight 1 six-carbon sugar 6H 2 O 6CO 2 6O 2 chloroplast 1 2 43 energy stroma (fluid outside the thylakoids)

9. Photosynthesis (19 min) http://player.discoveryeducation.com/index.cf m?guidAssetId=6156A4EE-3DBC-4C44-9677- 1413C6AC85C5&blnFromSearch=1&productco de=US

10. Dark Reactions of Photosynthesis http://player.discoveryeducation.com/index.cf m?guidAssetId=750578E5-E9F6-40A2-90EA- E97F5D0CBE80&blnFromSearch=1&productco de=US http://player.discoveryeducation.com/index.cf m?guidAssetId=750578E5-E9F6-40A2-90EA- E97F5D0CBE80&blnFromSearch=1&productco de=US