Photosynthesis

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Photosynthesis

• SPI.3.3 Compare and contrast photosynthesis and
  cellular respiration in terms of energy
  transformation.

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Energy

• Ability to do work
• Autotroph
• Heterotroph

creates own
obtains from food
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ATP

• Adenosine TriPhosphate
• Used by all cells for energy

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How Does ATP release energy?

• ATP breaks off a phosphate which releases energy

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ATP
SNAP
adenosine
P
P
P
Here is ATP (Adenosine Triphosphate)
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Im free!!!!
ADP
adenosine
P
P
P
We get ADP (Adenosine Diphosphate)
Tadaaa!!!
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ADP

• Will be recharged by adding a phosphate

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What does a plant use to obtain its mass?
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Photosynthesis

• Capturing light energy from the sun and changing
  it into food
• Performed by plants, algae, some bacteria
• Supplies food for other organisms

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Chloroplast

• Chloroplast is the organelle where chlorophyll is
  housed

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Pigments

• Absorb light
• Two main pigments Chlorophyll a Chlorophyll b
• Chlorophyll Green color

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Why is Chlorophyll Green?

• Absorbs violet red ?s
• ? wavelength
• Reflects green ?s

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Photosynthesis Formula
Sunlight
6CO2 6H2O
C6H12O6 602
Chlorophyll
Carbon Water Glucose
Oxygen Dioxide
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Two Types of Reactions

• Light Dependent Reactions
• Light Independent Reactions
• Calvin Cycle

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Light Dependent Rxn

• Thylakoid contains chlorophyll
• Uses light energy to break down water to produce
  energy oxygen

Released to atmosphere
Calvin Cycle
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Light Independent Rxn

• AKA Calvin Cycle
• Stroma
• Uses energy from light dependent rxns CO2 to
  make sugar

Enters through stomata
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Calvin Cycle is Dependent on Light Rxn

• Why?
• Needs the energy from thylakoids rxn to supply
  energy to make the sugar

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Affects on the Rate of Photosynthesis

• Water
• Temperature
• 0 35 ºC best enzyme function
• Intensity of light

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