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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 energy enters ecosystem.

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slide1

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.
slide2

Energy Flow and Chemical Cycling in the Biosphere

Sunlight energy

enters ecosystem

CO2 (Carbon dioxide)

C6H12O6 (Glucose)

Photosynthesis

+

+

O2 (Oxygen)

H2O (water)

Cellular respiration

drives cellular work

ATP

Heat energy exits ecosystem

slide3

Photosynthesis

  • Photosynthesis:
    • Is used by plants, some protists, and some bacteria
    • Transforms light energy into chemical energy
    • Uses carbon dioxide and water as starting materials

Light

energy

6 CO2

6 O2

C6H12O6

6 H2O

Photo-

synthesis

Carbon

dioxide

Water

Oxygen gas

Glucose

slide4

Photosynthesis

  • Organisms that use photosynthesis are:
    • Photosynthetic autotrophs
    • The producers for most ecosystems

PHOTOSYNTHETIC AUTOTROPHS

Plants

(mostly on land)

Photosynthetic Protists

(aquatic)

Photosynthetic Bacteria

(aquatic)

LM

Forest plants

Kelp, a large alga

Micrograph of cyanobacteria

slide5

Photosynthesis

found b/w lower and upper epidermis

slide6

Photosynthesis

CO2

H2O

Light

Chloroplast

NADP+

ADP

P

Calvin

cycle

Light

reactions

ATP

NADPH

O2

Sugar

(C6H12O6)

slide7

Photosynthesis

*photon

*Photons are absorbed by pigment molecules

slide8

Why Green?

Light

Reflected

light

Chloroplast

Absorbed

light

Transmitted

light

slide15

Alternative

Pathways

ALTERNATIVE PHOTOSYNTHETIC PATHWAYS

CAMPathway

(example: pineapple)

C4 Pathway

(example: sugarcane)

Cell

type 1

CO2

CO2

Night

Four-carbon

compound

Four-carbon

compound

CO2

CO2

Cell

type 2

Calvin

cycle

Calvin

cycle

Day

Sugar

Sugar

CAM plant

C4 plant

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