producers and consumers autotrophs (self-feeders): make their own organic matter from inorganic...

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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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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

Light

H2O

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