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Page 1: Photosynthesis. Autotrophs vs. Heterotrophs Autotrophs Organisms that use the sun’s energy to make their own food Plants Some bacteria Heterotrophs Organisms

Photosynthesis

Page 2: Photosynthesis. Autotrophs vs. Heterotrophs Autotrophs Organisms that use the sun’s energy to make their own food Plants Some bacteria Heterotrophs Organisms

Autotrophs vs. Heterotrophs Autotrophs

Organisms that use the sun’s energy to make their own food Plants Some bacteria

Heterotrophs Organisms that must consume other organisms to

obtain energy Animals Some Bacteria Fungi

Page 3: Photosynthesis. Autotrophs vs. Heterotrophs Autotrophs Organisms that use the sun’s energy to make their own food Plants Some bacteria Heterotrophs Organisms

Plants

Unicellular protist

Multicellular algae Cyanobacteria

Purple sulfurbacteria

10 µm

1.5 µm

40 µm

Page 4: Photosynthesis. Autotrophs vs. Heterotrophs Autotrophs Organisms that use the sun’s energy to make their own food Plants Some bacteria Heterotrophs Organisms

Identifying Autotrophs and Heterotrophs

Rose Human Tiger Palm Tree Fern Mushroom Sea Weed Venus Fly Trap

Autotroph Heterotroph Heterotroph Autotroph Autotroph Heterotroph Autotroph Autotroph

Page 5: Photosynthesis. Autotrophs vs. Heterotrophs Autotrophs Organisms that use the sun’s energy to make their own food Plants Some bacteria Heterotrophs Organisms

Photosynthesis Equation for reaction

6CO2 + 6H2O C6H12O6 + 6O2

carbon dioxide + water sugar + oxygen

Requirements for the reaction Water Carbon dioxide Light Chlorophyll (found in chloroplasts)

Page 6: Photosynthesis. Autotrophs vs. Heterotrophs Autotrophs Organisms that use the sun’s energy to make their own food Plants Some bacteria Heterotrophs Organisms

Pigments Primary Pigments

Chlorophyll a Chlorophyll b

Secondary Pigments Carotene

Red/orange

Xanthophyll yellow

Page 7: Photosynthesis. Autotrophs vs. Heterotrophs Autotrophs Organisms that use the sun’s energy to make their own food Plants Some bacteria Heterotrophs Organisms

Absorption of Light byChlorophyll a and Chlorophyll b

V B G YO R

Chlorophyll b

Chlorophyll a

Section 8-2

Go to Section:

Page 8: Photosynthesis. Autotrophs vs. Heterotrophs Autotrophs Organisms that use the sun’s energy to make their own food Plants Some bacteria Heterotrophs Organisms

Light Energy

Chloroplast

CO2 + H2O Sugars + O2

Section 8-2

Photosynthesis: Reactants and Products

Go to Section:

Page 9: Photosynthesis. Autotrophs vs. Heterotrophs Autotrophs Organisms that use the sun’s energy to make their own food Plants Some bacteria Heterotrophs Organisms

Inside a Chloroplast Thylakoids

Photosynthetic membranes Arranged in stacks (called grana) Contain pigments Site of the light-dependent reactions

Stroma Area around thylakoid membranes Site of the Calvin Cycle (light-independent

reactions)

Page 10: Photosynthesis. Autotrophs vs. Heterotrophs Autotrophs Organisms that use the sun’s energy to make their own food Plants Some bacteria Heterotrophs Organisms

Chloroplast

Light& water

O2

Sugars

CO2

Light-Dependent Reactions

CalvinCycle

NADPH

ATP

ADP + PNADP+Chloroplast

Section 8-3

Photosynthesis: An Overview

Go to Section:

Page 11: Photosynthesis. Autotrophs vs. Heterotrophs Autotrophs Organisms that use the sun’s energy to make their own food Plants Some bacteria Heterotrophs Organisms

Light-Dependent Reactions Occur in the thylakoid membranes Require light Occur during the day time Produce:

Oxygen ATP and NADPH (energy carriers)

Page 12: Photosynthesis. Autotrophs vs. Heterotrophs Autotrophs Organisms that use the sun’s energy to make their own food Plants Some bacteria Heterotrophs Organisms

Calvin Cycle Occur in the stroma Also called the Light-Independent

Reactions Do not require light Can occur during the day or night Uses ATP and NADPH to produce sugars

Page 13: Photosynthesis. Autotrophs vs. Heterotrophs Autotrophs Organisms that use the sun’s energy to make their own food Plants Some bacteria Heterotrophs Organisms

H2O

LIGHTREACTIONS

Chloroplast

Light

Page 14: Photosynthesis. Autotrophs vs. Heterotrophs Autotrophs Organisms that use the sun’s energy to make their own food Plants Some bacteria Heterotrophs Organisms

H2O

LIGHTREACTIONS

Chloroplast

Light

ATP

NADPH

O2

Page 15: Photosynthesis. Autotrophs vs. Heterotrophs Autotrophs Organisms that use the sun’s energy to make their own food Plants Some bacteria Heterotrophs Organisms

H2O

LIGHTREACTIONS

Chloroplast

Light

ATP

NADPH

O2

NADP+

CO2

ADPP+ i

CALVINCYCLE

[CH2O](sugar)

Page 16: Photosynthesis. Autotrophs vs. Heterotrophs Autotrophs Organisms that use the sun’s energy to make their own food Plants Some bacteria Heterotrophs Organisms

Factors Affecting Photosynthesis Water shortage Temperature (best temp 0-35 Celsius) Intensity of light


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