Photosynthesis and Respiration
Biology I
Mr. Beaty
Thomasville HS
Bellringer 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.
PhotosynthesisPhotosynthesis
Cellular RespirationCellular Respiration
AutotrophsAutotrophs Autotrophs and Heterotrophs
Autotrophs and Heterotrophs
LightEnergyLight
Energy
Organic Compounds + Oxygen
Carbon Dioxide + Water
What is ATP? 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 What is the overall formula for photosynthesis?
6CO2 + 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
L
Photosynthesis 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 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 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 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. 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
Photosystem II Photosystem I
Sun
ETC ETC
ATP
NADP+
NADPH
Water is split into H and O2
Water is split into H and O2
Pairs 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. Complete 6-1 study guide and active
reading assignment.
Bellringer
PhotosynthesisPhotosynthesis
Cellular RespirationCellular Respiration
AutotrophsAutotrophs Autotrophs and Heterotrophs
Autotrophs and Heterotrophs
LightEnergyLight
Energy
Organic Compounds + Oxygen
Carbon Dioxide + Water
Light Reaction Videos http://www.sumanasinc.com/webcontent/a
nisamples/majorsbiology/harvestinglight.swf
http://highered.mcgraw-hill.com/sites/0072437316/student_view0/chapter10/animations.html
Photosynthesis 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
NADPH ATP
CO2
Organic Compounds
Pairs 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 Photosynthesis1. 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 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 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 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 Complete Ch 6 Reading Guide and Active
Reading 6.2.
Summary 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.