producers and consumers
DESCRIPTION
Producers and Consumers. Autotrophs (self-feeders): Make their own organic matter from inorganic nutrients. Heterotrophs (other-feeders): Organisms that cannot make organic molecules from inorganic ones. Energy Flow and Chemical Cycling in the Biosphere. Sunlight energy enters ecosystem. - PowerPoint PPT PresentationTRANSCRIPT
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Producers and Consumers
Autotrophs (self-feeders):•Make their own organic matter from inorganic nutrients.
Heterotrophs (other-feeders):•Organisms that cannot make organic molecules from inorganic ones.
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Energy Flow and Chemical Cycling in the Biosphere
Sunlight energyenters ecosystem
Photosynthesis
Cellular respiration
drives cellular work
Heat energy exits ecosystem
ATP
C6H12O6
(Glucose)+O2
(Oxygen)
CO2
(Carbon dioxide)
+H2O
(water)
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Photosynthesis:•Is used by plants, some protists, and some bacteria•Transforms light energy into chemical energy •Uses carbon dioxide and water as starting materials
Photosynthesis
Carbon dioxide
6 O26 CO2 6 H2O C6H12O6
Water GlucosePhoto-synthesis Oxygen gas
Light energy
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Photosynthesis– Organisms that use photosynthesis are:• Photosynthetic autotrophs• The producers for most ecosystems
Plants(mostly on land)
Photosynthetic Protists(aquatic)
PHOTOSYNTHETIC AUTOTROPHSPhotosynthetic Bacteria
(aquatic)
Micrograph of cyanobacteriaKelp, a large algaForest plants
LM
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found b/w lower and
upper epidermis
Photosynthesis
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LightH2O
O2
Chloroplast
Lightreactions
NADPH
ATP
Calvincycle
CO2
NADP+
ADPP
Sugar(C6H12O6)
Photosynthesis
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*photon
*Photons are absorbed by
pigment molecules
Photosynthesis
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Why Green?
Light
Chloroplast
Reflectedlight
Absorbedlight Transmitted
light
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Light-harvesting complexes of the thylakoid membrane
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Electron Flow
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Organization of light reaction machinery
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Chemiosmosis: A Comparison
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Calvin cycle (Carbon Fixation)
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Photosynthesis
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Alternative Pathways
Sugar
C4 Pathway(example: sugarcane)
C4 plant CAM plantSugar
Calvincycle
Calvincycle
Day
Celltype 1
Four-carboncompound
Night
Four-carboncompound
Celltype 2
CAM Pathway(example: pineapple)
ALTERNATIVE PHOTOSYNTHETIC PATHWAYS
CO2 CO2
CO2 CO2