Photosynthesis: Getting Energy and Matter into Biological Systems

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Photosynthesis Getting Energy and Matter into
Biological Systems

Make a statement that explains the images above
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Review and Discuss!

• We, living organisms, need ________ in order to
  survive.
• Molecules like _________, ________, and _________
  found in food provide us this.
• Molecules are made of ____________ such as
  Carbon, Hydrogen, Oxygen, etc.
• These ___________ are what make up matter.
• So how do we get matter found in food in the
  first place? Who/what gets the credit?

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Photosynthesis is

• light create
• The process by which plants, some protists, and
  some bacteria use light energy (photo)
  transferred from the sun to create (synthesis)
  large, energy rich molecules from small ones.
• Energy transfer
• Sun ? autotroph
• Energy transformation
• Light ? Chemical Potential (food!)

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Photosynthesis

• Light Reactions
• Light is absorbed
• Water is split
• Carrier molecules ATP and NADPH are made
• Calvin Cycle
• Carbon is fixed
• G3P is made (precursor to glucose)
• ADP and NADP are made

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Where does this happen?

• All plants are made up of plant cells
• Most plant cells contain chloroplasts
• Inside chloroplasts, there are structures called
  thylakoids
• In the thylakoid membranes, chlorophyll is stored
• Chlorophyll is a pigment that absorbs the suns
  energy
• Why chlorophyll?

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Electromagnetic Spectrum
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• Light energy from the sun hits the chlorophyll
  molecules
• Much of the light energy is absorbed but one
  wavelength of light is reflected off, not
  absorbed.
• This is the color of light that you see.

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So why are thylakoids green?
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That is how light entersHow does carbon enter?
Stomate (Stomata, plural)
Bottom of a leaf
Cross-section of a leaf
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The Calvin Cycle a series of biochemical
reactions that converts atmospheric CO2 into
carbohydrate molecules (glucose, etc.)
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Why does it happen?

• Autotrophs get and store energy
• Heterotrophs eat autotrophs and use these
  carbohydrates as energy sources

Do you get this random picture?
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The Big Picture

• See picture! Should be linked.

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The Reaction
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Factors that may affect the rate of
photosynthesis

• Intensity of light
• Amount of CO2
• Water availability?
• What else?
• Color of light?
• Toxins?
• Soil nutrients?

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Optional Video Clips

• http//www.teachersdomain.org/9-12/sci/life/cell/p
  hotosynth/index.html
• Possibly too much detail, but good detail ?
• https//www.youtube.com/watch?vwJDlxp17rY4
• https//www.youtube.com/watch?vg78utcLQrJ4
  (Bozeman Biology)
• https//www.youtube.com/watch?v-rsYk4eCKnA (Khan
  Academy)

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Follow Up Work

• Read Essay in textbook, Getting Light Energy into
  Biological Systems, p.367
• Write the 5 big take-aways from essay
• Draw one diagram that locked it in for you (ok to
  copy from textbook)
• Complete Photosynthesis Review WS