objective: you will be able to write the equation of photosynthesis. do now: read “autotrophs and...
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Objective: You will be able to write the equation of photosynthesis.
Do Now:• Read “Autotrophs and heterotrophs” on p. 201• Differentiate between autotrophs and
heterotrophs
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Photosynthesis Equation
6CO2 + 6H2O C6H12O6 + 6O2
Carbon + Water Glucose + Oxygen
Dioxide
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Bromothymol
• Used to test for the presence of carbon dioxide (CO2)
• If CO2 is present it is a yellow color
• If CO2 is NOT present it is a blue color
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Objective: You will be able to identify and give the function of the parts of a leaf.
Do Now:• Read “Light and pigments” on p. 207• List the FOUR things that plants need to have
for photosynthesis
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Vein
Leaf cross section
Mesophyll
CO2 O2Stomata
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Chloroplasts: The Sites of Photosynthesis
Chloroplast
Mesophyll
5 µm
Outermembrane
Intermembranespace
Innermembrane
Thylakoidspace
Thylakoid
GranumStroma
1 µm
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Activity
• View a leaf slide under medium power
• Locate the stomata– They should be on the bottom, if they are on
top you slide is upside down.
• Draw a small region of the leaf
• Label the various parts of a leaf that we learned about
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Objective: You will be able to identify experimental variables
Do Now:• Read “Setting up a controlled experiment” on p. 9• Differentiate between manipulated and
responding variables
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Controlled Experiments
• Have an independent variable– The “thing” that you are changing
• Have a dependent variable– The “thing” that is affected when you change
the independent variable
• Manipulated variable?
• Responding variable?
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Example
• Which color light works best for photosynthesis?
• What is the:– Independent (manipulated) variable?– Dependent (responding) variable?
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Controlled experiments
• Also use one setup known as the control group
• A control group is where the manipulated variable is removed
• You can think of the control group as being used for comparison
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Examples of controls
• What color light is best for photosynthesis?– Control is one that does not have a particular
color of light.
• Will plants grow more if fertilizer is added?– Control is the setup that does not get the
fertilizer
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You try
• What affect does the intensity of light have on photosynthesis?
• Using a partner come up with the:– Manipulated variable– Responding variable– Control group
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Problems1. Will plants carry out more photosynthesis
if they are given more CO2?2. Will plants grow more if they are exposed
to “dark light”?3. Can plants produce more oxygen if you
talk to them?4. What type of music will cause plants to
release more oxygen?5. What effect does temperature have on
the growth of plants?
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Objective: You will be able to explain how plants can absorb light for photosynthesis.
Do Now:• Read “Light and pigments” again on p. 207
• What colors of light are absorbed by a plant?
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Chloroplast
Mesophyll
5 µm
Outermembrane
Intermembranespace
Innermembrane
Thylakoidspace
Thylakoid
GranumStroma
1 µm
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Gammarays X-rays UV Infrared
Micro-waves
Radiowaves
10–5 nm 10–3 nm 1 nm 103 nm 106 nm1 m
106 nm 103 m
380 450 500 550 600 650 700 750 nm
Visible light
Shorter wavelength
Higher energy
Longer wavelength
Lower energyFigure 10.6
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Light
ReflectedLight
Chloroplast
Absorbedlight
Granum
Transmittedlight
Figure 10.7