photosynthesis here comes the sun gneei7x4c
TRANSCRIPT
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Photosynthesis
here comes the sun
https://www.youtube.com/watch?v=Y6GNEEi7x4c
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Where do all living things ultimately get
energy?
https://www.youtube.com/watch?v=g66NL4o_Mq8
Pay attention to energy inputs:
https://www.youtube.com/watch?v=25BOohiCF5A(19:00 minutes)
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Where do all living things ultimately get energy?
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How? Through photosynthesis!
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$$$!
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$$$!
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$$$!
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Through photosynthesis!
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But first, remember ATP!
• ADP + Pi+ ENERGY!
Adenosine P P P
Adenosine P P P+
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How can a molecular bond have “high energy?”
• Molecules want to get to the most stable state -
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How can a bond have “high energy?”
• Molecules want to get to the most stable state - the higher energy they have the less stable they are
Potential Energy
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ATP-ADP Cycle!
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Back to…photosynthesis!(Plants (usually) can’t
eat!)
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Photosynthesis Equation
What other process does this remind you of?
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Photosynthesis Equation
What other process does this remind you of?
CELLULAR RESPIRATION (flipped)!
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Origins
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1) What are the graph axes? 2) What process led to the peak in stage 5? 3) Which cell organelle caused the drop in
stage 5?
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bacterial origins
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All stages of photosynthesis take place in the chloroplast
Let’s watch Zach’s video!
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Find the chloroplast in your plant cell:
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Anatomy of a chloroplast
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Remember, chloroplasts are in the cells of
leaves…
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Photosynthesis Equation
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Photosynthesis Inputs
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Carbon Dioxide- CO2
Image: zirconicusso / FreeDigitalPhotos.net
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C02 enters through stomata
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Stomata
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Water - H2O
Image: zirconicusso / FreeDigitalPhotos.net
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water from the roots
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Sunlight
Image: healingdream / FreeDigitalPhotos.net
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Photosynthesis Outputs
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ATP!
Adenosine P P P
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Oxygen & Water
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C3 Stem Molecules• These can be built into
carbohydrates, lipids, and proteins!
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Glucose (or Fructose) (carbs)
Text
Image: arkorn / FreeDigitalPhotos.net
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Cellulose (carbs)
Image: Chris Sharp / FreeDigitalPhotos.net
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Lipids & Proteins
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photosynthesis has two reaction steps
2
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1reactions
take place only in the presence of light and produce ATP
light-dependent
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2reactions
do not need light & create organic molecules
light-independent
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Overview of both steps
ATP!
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The Light Reaction• goal: to make loads of ATP
• Inputs:
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Sunlight
Image: healingdream / FreeDigitalPhotos.net
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Water
Image: zirconicusso / FreeDigitalPhotos.net
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Light Reaction
• Outputs:
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ATP!
Adenosine P P P
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Oxygen!
O O
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The Light Reaction
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requires light!
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ONLY red and blue light
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the pigment chlorophyll is found on the thylakoid membranes
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what makes leaves green?
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the pigment chlorophyll is found on the thylakoid membranes
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what about leaves in Fall?
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The Light Rxn
• To the board
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To summarize:
The plant uses sunlight to split water to produce a ton of ATP.
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The Light Independent Reaction
a.k.a. the dark reaction
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Light Indep. Rxn
• Goal: to produce C3 stem molecules
• Inputs:
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Carbon Dioxide- CO2
Image: zirconicusso / FreeDigitalPhotos.net
CARBON FIXATION
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ATP!
Adenosine P P P
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Light Indep. Rxn
• Goal: to produce C3 stem molecules
• Outputs:
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C3 Stem Molecules• These can be built into
carbohydrates, lipids, and proteins!
Water (from both)
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happens in stroma
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the stroma is a liquid substance around the thylakloids
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• To the board
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To summarize:
• CO2 was rearranged into C3 molecules
• ATP was used and H2O was made
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Overview of both steps
ATP!
water
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The overall reaction for photosynthesis
6 CO2 + 12 H2O + light → C6H12O6 + 6 H2O + 6 O2
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Now for…
• Complicated, but contextual, MOVIE:
• https://www.youtube.com/watch?v=YeD9idmcX0w
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Revision clarification• Go to teacher page, print revision
sheet, and follow instructions! Answer questions found on the sheet – you’re not revising your quizzes directly.
• The revisions will help you learn to use resources you have. They break down questions to help with problem solving. See me with any questions that remain.
• Due Friday 3:30 pm, Earth Lab.
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GradingA+ - Above and beyond in every way!
A – greater than 92
A- -- greater than 89 – 92
B+ -- greater than 85 – 89
B – greater than 81 – 85
C+ -- greater than 77 – 81
C – greater than 73 – 77
C- -- greater than 69 to 73
D – 50 to 69 F – below 50
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Photosynthesis Drawings Should Include…
1) The 2 stages of photosynthesis
2) The inputs and outputs of photosynthesis, and how they enter and exit the chloroplast
3) The role and location of each of the items on the photosynthesis vocabulary list
4) Colors to distinguish between cell parts in your drawing and the stages of photosynthesis
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• Giant water lilies: https://www.youtube.com/watch?v=igkjcuw_n_U&list=PLCC07E66503F99BB5