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
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 energyenters ecosystem
Photosynthesis
Cellular respiration
drives cellular work
Heat energy exits ecosystem
ATP
C6H12O6
(Glucose)+O2
(Oxygen)
CO2
(Carbon dioxide)
+H2O
(water)
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
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
found b/w lower and
upper epidermis
Photosynthesis
LightH2O
O2
Chloroplast
Lightreactions
NADPH
ATP
Calvincycle
CO2
NADP+
ADPP
Sugar(C6H12O6)
Photosynthesis
*photon
*Photons are absorbed by
pigment molecules
Photosynthesis
Why Green?
Light
Chloroplast
Reflectedlight
Absorbedlight Transmitted
light
Light-harvesting complexes of the thylakoid membrane
Electron Flow
Organization of light reaction machinery
Chemiosmosis: A Comparison
Calvin cycle (Carbon Fixation)
Photosynthesis
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