photosynthesis. autotrophs vs. heterotrophs autotrophs organisms that use the sun’s energy to make...
TRANSCRIPT
Photosynthesis
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
Plants
Unicellular protist
Multicellular algae Cyanobacteria
Purple sulfurbacteria
10 µm
1.5 µm
40 µm
Identifying Autotrophs and Heterotrophs
Rose Human Tiger Palm Tree Fern Mushroom Sea Weed Venus Fly Trap
Autotroph Heterotroph Heterotroph Autotroph Autotroph Heterotroph Autotroph Autotroph
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)
Pigments Primary Pigments
Chlorophyll a Chlorophyll b
Secondary Pigments Carotene
Red/orange
Xanthophyll yellow
Absorption of Light byChlorophyll a and Chlorophyll b
V B G YO R
Chlorophyll b
Chlorophyll a
Section 8-2
Go to Section:
Light Energy
Chloroplast
CO2 + H2O Sugars + O2
Section 8-2
Photosynthesis: Reactants and Products
Go to Section:
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)
Chloroplast
Light& water
O2
Sugars
CO2
Light-Dependent Reactions
CalvinCycle
NADPH
ATP
ADP + PNADP+Chloroplast
Section 8-3
Photosynthesis: An Overview
Go to Section:
Light-Dependent Reactions Occur in the thylakoid membranes Require light Occur during the day time Produce:
Oxygen ATP and NADPH (energy carriers)
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
H2O
LIGHTREACTIONS
Chloroplast
Light
H2O
LIGHTREACTIONS
Chloroplast
Light
ATP
NADPH
O2
H2O
LIGHTREACTIONS
Chloroplast
Light
ATP
NADPH
O2
NADP+
CO2
ADPP+ i
CALVINCYCLE
[CH2O](sugar)
Factors Affecting Photosynthesis Water shortage Temperature (best temp 0-35 Celsius) Intensity of light