warm up monday november 19th list 5 common household items that you use everyday that come from...
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Warm Up Monday November 19th
List 5 common household items that you use everyday that come from plants.
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PHOTOSYNTHESIS
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The Sunthe ultimate source of allenergy for all life on Earth
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Autotrophs Vs. HeterotrophsAn autotroph is an organism that feeds itself!
(produces its own food!)
A heterotroph is an organism that feeds on another organism (cannot produce own food!)
Can you think of an example of each?
Poison Sumac Lions (and Zebras for that matter!)
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Autotroph or Heterotroph?
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Autotroph or Heterotroph?
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Autotroph or Heterotroph?
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Autotroph or Heterotroph?
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Autotroph or Heterotroph?
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PhotoautotrophsPhoto = Light
Auto = Self
Troph = Feed
Plants are “photoautotrophs” because they feed themselves with light.
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PHOTOSYNTHESIS…is the conversion of light
energy into chemical energy by living organisms
Prickly Pear Cactus Cedar Tree
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Why should I care about
photosynthesis?More than 200 years ago, Priestly
stumbled upon the answer!Who? Me? NO! ME!!!
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Joseph Priestly1733-1804
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Photosynthesis overview
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What Light is Available for Plants to use?
Light acts as both aparticle (photon) anda wave!
The different lengthsof light waves createthe spectrum of colorswe can see!
Red = LONG wavesViolet = SHORT waves
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How do plants absorb light?
Pigments in the chloroplast absorb a variety of light energy wavelengths. Examples:
Chlorophyll A & B
Xanthophyll
Carotenoids
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Chlorophyll a Found in all plants, algae and
cyanobacteria. Makes photosynthesis possible. Participates directly in light reactions Can accept energy from chlorophyll b
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Chlorophyll b Is an accessory pigment Chlorophyll b acts indirectly in
photosynthesis by transferring the light it absorbs to chlorophyll a
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Plant PigmentsSeen w/ Paper Chromatography
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Absorption SpectrumPlants only absorb violet and red light,
and reflect green light, which is why plants appear green!
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Where does Photosynthesis happen?
In Chloroplasts!
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What’s in a Chloroplast?
Photosynthesis takes place within the thylakoid membranes!
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Light Reactions
Calvin Cycle
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Light ReactionsFirst step in photosynthesis
where light energy is converted to chemical energy.
Light energy is used to break apart H2O into H2 & O2.
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The H+ ions and the free electrons that result from breaking apart water make high energy molecules!
ATP & NADPH
Light Reactions
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The Calvin CycleA set of reactions that turn CO2 into Carbon assembled into glucose. CO2 SugarsThe Calvin Cycle requires energy from ATP & NADPH made by Light Reactions!aka “Dark Reactions” b/c doesn’t need light
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Dark Reactions(calvin cycle)
Chemical reactions that convert
CO2 and other compounds into
Glucose!
Doesn’t require light energy.
Takes place in the space outside
the thylakoid membrane.
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Photosynthesis