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Photosynthesis !. Which of the following best describes photosynthesis? 1. Makes energy from sunlight 2. Converts food to energy 3. Converts energy (sunlight)

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Presentation on theme: "Photosynthesis !. Which of the following best describes photosynthesis? 1. Makes energy from sunlight 2. Converts food to energy 3. Converts energy (sunlight)"— Presentation transcript:

1 Photosynthesis !

2 Which of the following best describes photosynthesis? 1. Makes energy from sunlight 2. Converts food to energy 3. Converts energy (sunlight) to sugars

3 The process by which green plants use the energy of the sunlight to produce sugars (carbohydrates)

4

5 1) Light Dependent Reaction (produces energy) a. Reactions require direct involvement of light b. Occurs at chloroplasts i. Chlorophyll is main pigment of green plants ii. Absorbs blue/red regions of spectrum iii. Reflects green

6 c. Produce ATP d. Produce high energy electrons carried by NADP + e. Provide energy to make carbohydrates (sugars)!!!

7 Energy will be used to… Produce NADPH Split water Etc….

8 The purpose of the light- dependent reactions is to… 1. Make sugars 2. Make energy

9 2) Light Independent Reaction (makes sugars) a. Does not directly involve light i. Can occur in the light or dark b. ATP and NADPH enter these reactions c. Convert energy from ATP and NADPH into a form that can be stored –Converts carbon dioxide and water into glucose

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11 These reactions: Produces energy rich sugars Removes CO 2 from the atmosphere 6 turns = 1 sugar molecule

12 Formula for photosynthesis 6CO 2 + 6H 2 O C 6 H 12 O 6 + 6O 2 sunlight

13 Importance of photosynthesis Light energy converted to chemical energy

14 Which type of reaction can only occur in the light? 1. Light-dependent reaction 2. Calvin Cycle 3. Light-independent reaction

15 How many turns of the Calvin cycle make 1 glucose?

16 Metabolism Sunlight Photosynthesis (autotrophs) Cellular Respiration

17 Metabolism –All of the chemical reactions in a cell 1. Anabolic pathways –Use energy to build larger molecules from smaller molecules –Photosynthesis: light energy from the sun is converted to chemical energy (builds glucose) 2. Catabolic pathways –Release energy by breaking down larger molecules into smaller molecules –Cellular Respiration: organic molecules (glucose) are broken down to release energy


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