Photosynthesis !

Which of the following best describes photosynthesis? Makes energy from sunlight Converts food to energy Converts energy (sunlight) to sugars 29 of 32

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

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

Produce ATP Produce high energy electrons carried by NADP+ Provide energy to make carbohydrates (sugars)!!!

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

The purpose of the light-dependent reactions is to… Make sugars Make energy 28 of 32

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

These reactions: Produces energy rich sugars Removes CO2 from the atmosphere 6 turns = 1 sugar molecule

Formula for photosynthesis 6CO2 + 6H2O  C6H12O6 + 6O2 sunlight

Importance of photosynthesis Light energy converted to chemical energy

Which type of reaction can only occur in the light? Light-dependent reaction Calvin Cycle Light-independent reaction 29 of 32

How many turns of the Calvin cycle make 1 glucose? 2 3 4 5 6 28 of 32

Metabolism Sunlight Photosynthesis (autotrophs) Cellular Respiration

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