Embed Size (px)
Citation preview
Photosynthesis !
Which of the following best describes photosynthesis?
1 2 3
48%
34%
17%
1. Makes energy from sunlight
2. Converts food to energy
3. Converts energy (sunlight) to sugars
The process by which green plants use the energy of
the sunlight to produce sugars (carbohydrates)
1) Light Dependent Reaction(produces energy)
a. Reactions require direct involvement of light
b. Occurs at chloroplastsi. Chlorophyll is main pigment of green plants
ii. Absorbs blue/red regions of spectrum
iii. Reflects green
c. Produce ATP
d. Produce high energy electrons carried by NADP+
e. Provide energy to make carbohydrates (sugars)!!!
Energy will be used to…
Produce NADPHSplit waterEtc….
The purpose of the light-dependent reactions is to…
1 2
61%
39%
1. Make sugars
2. Make energy
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?
1 2 3
79%
14%7%
1. Light-dependent reaction
2. Calvin Cycle
3. Light-independent reaction
How many turns of the Calvin cycle make 1 glucose?
1 2 3 4 5 6
0%4%
86%
0%
7%4%
1. 1
2. 2
3. 3
4. 4
5. 5
6. 6
Metabolism
Sunlight
Photosynthesis(autotrophs)
Cellular Respiration
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
