Photosynthesis and Respiration
Biology I
Mr. Beaty
Thomasville HS
Bellringer
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How do autotrophs and
heterotrophs obtain energy?
How is photosynthesis different
from respiration?
Can animals that do not use the
sun live without it? Explain.
Light
Energy
Photosynthesis
Organic Compounds
+ Oxygen
Autotrophs and
Heterotrophs
Autotrophs
Carbon Dioxide
+ Water
Cellular Respiration
What is ATP?
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ATP is a compound that stores energy.
The energy is stored in the bonds that
hold the phosphates together.
ADP plus phosphate = ATP
ADP can be recycled.
How are ADP and ATP similar to
batteries?
Photosynthesis
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What is the overall formula for
photosynthesis? L
6CO2
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+ 6H20
C6H12O6 + 6O2
How does this formula compare to the
overall formula for aerobic respiration?
It is the complete opposite!
C6H12O6 + 6O2
6CO2 + 6H20 + E
Photosynthesis
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Plants and some other organisms are
autotrophs.
Like Bacteria, Protista
Autotrophs make their own food by
converting sunlight energy into
chemical energy that is stored in
chemical bonds.
The process is know as
photosynthesis.
Photosynthesis
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Plants use specialized structures called
chloroplasts.
The chloroplast has two membranes,
an inner and outer membrane. Inside
the inner membrane are flattened sacs
called thylakoids.
Each stack of thylakoids are known as
granum.
Photosynthesis
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Surrounding the thylakoids is a
solution called stroma.
Located in the thylakoid membrane
are pigments that absorb light energy.
The most famous pigment is called
chlorophyll.
Bellringer
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Where does photosynthesis occur?
Why do plants carry it out?
What are the parts of the chloroplast?
What is the main pigment found in
chloroplasts?
What is the ADP – ATP Cycle?
What colors of light do pigments best
absorb?
Draw a picture of the chloroplast
and label its parts.
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Quiz your partner until both of you
can identify the major components of
the chloroplast.
Where does the light reaction occur?
Where does the dark reaction occur?
Light Reaction
Sun
Sun
Photosystem II
NADP+ NADPH
ETC Photosystem I
Water is split
into H and O2
ETC
ATP
Pairs
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Using the models, take turn explaining
the steps of photosynthesis to your
partner.
What reactants are used in the light
reaction? What products come out?
Assignment- Start today, finish next
week.
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Complete 6-1 study guide and active
reading assignment.
Bellringer
Light
Energy
Photosynthesis
Organic Compounds
+ Oxygen
Autotrophs and
Heterotrophs
Autotrophs
Carbon Dioxide
+ Water
Cellular Respiration
Light Reaction Videos
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http://www.sumanasinc.com/webcontent/an
isamples/majorsbiology/harvestinglight.swf
http://highered.mcgrawhill.com/sites/0072437316/student_view0/c
hapter10/animations.html
Photosynthesis
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Once the light reaction creates
NADPH and ATP, these products are
used to power the Calvin cycle.
The Calvin cycle converts CO2 into
organic compounds. It takes many
turns of the cycle to produce a single
molecule of glucose.
Calvin Cycle
CO2
NADPH
Organic Compounds
ATP
Pairs
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Using the models, take turn explaining
the steps of photosynthesis to your
partner.
What reactants are used in the light
reaction? What products come out?
What reactants are used in the Calvin
Cycle? What products come out?
Balance Sheet for Photosynthesis
1. Water is split in the light reaction that produces
ATP and NADPH.
2. NADPH and ATP are used to power the Calvin
Cycle which fixes molecules of CO2 into organic
compounds.
3. One turn of the Calvin Cycle fixes one
molecule of CO2.
4. A variety of organic compounds are formed,
including amino acids, lipids, and carbohydrates.
• Most typically the carbohydrate glucose
(C6H12O6) is used in the formula.
CO2 + H20 => C6H12O6 + O2
Other pathways
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The Calvin cycle fixes carbon into 3
carbon compounds.
C4 pathway fixes carbon into 4 carbon
compounds.
CAM pathway – Adaptation made for
plants that grow in hot dry climates.
Exchange gases at night and the
Calvin cycle occurs during the day.
Pairs
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How are CAM and C4 pathways different
than normal photosynthesis?
Make a chart that compare the three
different pathways.
What type of plants benefit from the CAM
pathway? What is one downfall of the
CAM cycle?
The rate of photosynthesis
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Environmental factors can affect the
rate of photosynthesis.
Analyze the graphs with your partner
and discuss how temperature and light
affect the rate of photosynthesis. (pg
124)
Homework
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Complete Ch 6 Reading Guide and Active
Reading 6.2.
Summary
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What is the overall formula for
photosynthesis?
Why do we need plants in order to
survive?
Describe what happens in the light and
dark reaction(Calvin Cycle) of
photosynthesis.