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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Transcript of Warm Up Monday November 19th List 5 common household items that you use everyday that come from...
Warm Up Monday November 19th
List 5 common household items that you use everyday that come from plants.
PHOTOSYNTHESIS
The Sunthe ultimate source of allenergy for all life on Earth
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!)
Autotroph or Heterotroph?
Autotroph or Heterotroph?
Autotroph or Heterotroph?
Autotroph or Heterotroph?
Autotroph or Heterotroph?
PhotoautotrophsPhoto = Light
Auto = Self
Troph = Feed
Plants are “photoautotrophs” because they feed themselves with light.
PHOTOSYNTHESIS…is the conversion of light
energy into chemical energy by living organisms
Prickly Pear Cactus Cedar Tree
Why should I care about
photosynthesis?More than 200 years ago, Priestly
stumbled upon the answer!Who? Me? NO! ME!!!
Joseph Priestly1733-1804
Photosynthesis overview
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
How do plants absorb light?
Pigments in the chloroplast absorb a variety of light energy wavelengths. Examples:
Chlorophyll A & B
Xanthophyll
Carotenoids
Chlorophyll a Found in all plants, algae and
cyanobacteria. Makes photosynthesis possible. Participates directly in light reactions Can accept energy from chlorophyll b
Chlorophyll b Is an accessory pigment Chlorophyll b acts indirectly in
photosynthesis by transferring the light it absorbs to chlorophyll a
Plant PigmentsSeen w/ Paper Chromatography
Absorption SpectrumPlants only absorb violet and red light,
and reflect green light, which is why plants appear green!
Where does Photosynthesis happen?
In Chloroplasts!
What’s in a Chloroplast?
Photosynthesis takes place within the thylakoid membranes!
Light Reactions
Calvin Cycle
Light ReactionsFirst step in photosynthesis
where light energy is converted to chemical energy.
Light energy is used to break apart H2O into H2 & O2.
The H+ ions and the free electrons that result from breaking apart water make high energy molecules!
ATP & NADPH
Light Reactions
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
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.
Photosynthesis
