End Show Slide 1 of 28 8-2 Photosynthesis: An Overview.
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Transcript of End Show Slide 1 of 28 8-2 Photosynthesis: An Overview.
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Slide 1 of 28
8-2 Photosynthesis: An Overview
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Slide 2 of 28
8-2 Photosynthesis: An Overview 8-2 Photosynthesis: An Overview
Photosynthesis is the process in which green plants use the energy of sunlight to convert water and carbon dioxide into high-energy carbohydrates and oxygen.
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8-2 Photosynthesis: An Overview
Copyright Pearson Prentice Hall
The Photosynthesis Equation
What is the overall equation for photosynthesis?
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Slide 4 of 28
8-2 Photosynthesis: An Overview
Copyright Pearson Prentice Hall
The Photosynthesis Equation
The Photosynthesis Equation
The equation for photosynthesis is:
6CO2 + 6H2O C6H12O6 + 6O2
carbon dioxide + water sugars + oxygen
Light
Light
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Slide 5 of 28
8-2 Photosynthesis: An Overview
Copyright Pearson Prentice Hall
The Photosynthesis Equation
O2
CO2
+H20
Sugar
ADPNADP+
Light-Dependent Light-Dependent Reactions Reactions
(thylakoids)(thylakoids)
H2O
ATPNADPH
Calvin Cycle (stroma)
Light energy
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Slide 6 of 28
8-2 Photosynthesis: An Overview
Copyright Pearson Prentice Hall
Light and Pigments
What is the role of light and chlorophyll in photosynthesis?
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Slide 7 of 28
8-2 Photosynthesis: An Overview
Copyright Pearson Prentice Hall
Light and Pigments
Light and Pigments
How do plants capture the energy of sunlight?
In addition to water and carbon dioxide, photosynthesis requires light and chlorophyll.
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Slide 8 of 28
8-2 Photosynthesis: An Overview
Copyright Pearson Prentice Hall
Light and Pigments
Plants gather the sun's energy with light-absorbing molecules called pigments.
The main pigment in plants is chlorophyll.
There are two main types of chlorophyll:
• chlorophyll a
• chlorophyll b
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Slide 9 of 28
8-2 Photosynthesis: An Overview
Chlorophyll absorbs light well in the blue-violet and red regions of the visible spectrum.
Copyright Pearson Prentice Hall
Light and Pigments
Wavelength (nm)
Est
imat
ed A
bso
rpti
on
(%
) 100
80
60
40
20
0400 450 500 550 600 650 700 750
Chlorophyll b
Chlorophyll a
Wavelength (nm)
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Slide 10 of 28
8-2 Photosynthesis: An Overview
Copyright Pearson Prentice Hall
Light and Pigments
Chlorophyll does not absorb light within the green region of the spectrum.
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Slide 11 of 28
8-2 Photosynthesis: An Overview
Copyright Pearson Prentice Hall
Light and Pigments
When chlorophyll absorbs light, much of the energy is transferred directly to electrons in the chlorophyll molecule.
These high-energy electrons are what make photosynthesis work.
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Slide 12 of 28
Copyright Pearson Prentice Hall
8-2
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Slide 13 of 28
Copyright Pearson Prentice Hall
8-2
In van Helmont's experiment, most of the added mass of the tree came from
a. soil and carbon dioxide.
b. water and carbon dioxide.
c. oxygen and carbon dioxide.
d. soil and oxygen.
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Slide 14 of 28
Copyright Pearson Prentice Hall
8-2
Plants use the sugars produced in photosynthesis to make
a. oxygen.
b. starches.
c. carbon dioxide.
d. protein.
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Slide 15 of 28
Copyright Pearson Prentice Hall
8-2
The raw materials required for plants to carry out photosynthesis are
a. carbon dioxide and oxygen.
b. oxygen and sugars.
c. carbon dioxide and water.
d. oxygen and water.
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Slide 16 of 28
Copyright Pearson Prentice Hall
8-2
The principal pigment in plants is
a. chloroplast.
b. chlorophyll.
c. carotene.
d. carbohydrate.
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Slide 17 of 28
Copyright Pearson Prentice Hall
8-2
The colors of light that are absorbed by chlorophylls are
a. green and yellow.
b. green, blue, and violet.
c. blue, violet, and red.
d. red and yellow.
END OF SECTION
