Comparing Photosynthesis and Respiration

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Comparing Photosynthesisand Respiration
The most important chemical reaction in the world
is
PHOTOSYNTHESIS
The chemical reaction for photosynthesis is
6CO2 6H2O energy C6H12O6 6O2
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Comparing Photosynthesisand Respiration
PHOTOSYNTHESIS
Sugar
Carbon Dioxide
6CO2 6H2O energy C6H12O6 6O2
Oxygen
Sunlight
Water
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Comparing Photosynthesisand Respiration
Stage 1
PHOTOSYNTHESIS
Chlorophyll in the Chloroplasts captures sunlight
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Comparing Photosynthesisand Respiration
Stage 2
PHOTOSYNTHESIS
The cell uses the captured sunlight, carbon
dioxide and water to make food
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Comparing Photosynthesisand Respiration
Stage 2
PHOTOSYNTHESIS
Carbon Dioxide enters the plant through Stomata
-small openings on the underside of the leaf
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COMPARING PHOTOSYNTHESIS AND RESPIRATION
THE PHOTOSYNTHESIS - RESPIRATION CYCLE
PHOTOSYNTHESIS
RESPIRATION
Plants Produce
Sugar Oxygen
Organisms Use
Carbon Dioxide Water Energy
Plants use
Organisms Produce
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Comparing Photosynthesisand Respiration
The process by which cells obtain energy from
glucose
RESPIRATION
The chemical reaction for respiration is
C6H12O6 6O2 6CO2 6H2O energy
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Comparing Photosynthesisand Respiration
RESPIRATION
Carbon Dioxide
Oxygen
C6H12O6 6O2 6CO2 6H2O energy
Water
Sugar
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Comparing Photosynthesisand Respiration
RESPIRATION
Stage 1
Takes place in the cytoplasm
Molecules of glucose are broken down into smaller
molecules
Oxygen is NOT involved
Small amount of energy is released
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Comparing Photosynthesisand Respiration
RESPIRATION
Stage 2
Takes place in the Mitochondria
Small molecules are broken down into even smaller
molecules
Oxygen is required
A great deal of energy is released
Carbon dioxide and water are also produced
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COMPARING PHOTOSYNTHESIS AND RESPIRATION
THE PHOTOSYNTHESIS - RESPIRATION CYCLE
PHOTOSYNTHESIS
RESPIRATION
Sugar Oxygen
Plants Produce
Sugar Oxygen
Organisms Use
Carbon Dioxide Water Energy
Organisms Produce
Plants use
Carbon Dioxide Water Energy
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COMPARING PHOTOSYNTHESIS AND RESPIRATION
THE PHOTOSYNTHESIS - RESPIRATION CYCLE
PHOTOSYNTHESIS
Plants Produce
Sugar Oxygen
Carbon Dioxide Water Energy
Plants use
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Comparing Photosynthesisand Respiration
Testing Photosynthetic Rate of Elodea
Elodea a common water plant
Elodea releases bubbles of oxygen as it
photosynthesizes
Freshly cut Elodea stems produce more bubbles
than the leaves
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Comparing Photosynthesisand Respiration
Testing Photosynthetic Rate of Elodea
Materials
Elodea Plants
Scissors
Large Container
Clear test tube
Water
Sunlight
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Comparing Photosynthesisand Respiration
Testing Photosynthetic Rate of Elodea
Procedures
Fill the large container half full of water
Cut the stem of the Elodea plant at an angle (for
greater surface area)
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Comparing Photosynthesisand Respiration
Testing Photosynthetic Rate of Elodea
Procedures
Insert the plant, cut stem first, into the test
tube
Fill the test tube to overflowing with water
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Comparing Photosynthesisand Respiration
Testing Photosynthetic Rate of Elodea
Procedures
Cover the top of the test tube with your thumb
Invert the test tube over the beaker and put the
test tube with your thumb still covering the
opening into the beaker
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Comparing Photosynthesisand Respiration
Testing Photosynthetic Rate of Elodea
Procedures
Release your thumb and gently settle the test
tube on the bottom of the container
Place the beaker and test tube in sunlight or
under a bright lamp
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Comparing Photosynthesisand Respiration
Testing Photosynthetic Rate of Elodea
Procedures
At 5 minute intervals for a total of 15 minutes,
record the number of bubbles produced
Make a graph of your findings
Have someone in your group report out to the class
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COMPARING PHOTOSYNTHESIS AND RESPIRATION
THE PHOTOSYNTHESIS - RESPIRATION CYCLE
RESPIRATION
Sugar Oxygen
Organisms Use
Organisms Produce
Carbon Dioxide Water Energy
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Comparing Photosynthesisand Respiration
Respiration and Carbon Dioxide
Bromthymol Blue (BTB)
An acid-base indicator that can be used to
measure levels of carbon dioxide (CO2)
BTB changes color from blue to green and then
yellow as it gets more acidic
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Comparing Photosynthesisand Respiration
Respiration and Carbon Dioxide
Bromthymol Blue (BTB)
If carbon dioxide is added to the solution it
will become more acidic and change color moving
to green and then yellow
If carbon dioxide is removed from the solution it
will become more basic and change color moving to
blue
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Comparing Photosynthesisand Respiration
Respiration and Carbon Dioxide
This experiment uses Bromthymol Blue to examine
the relationship between exercise and the amount
of carbon dioxide you produce
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Comparing Photosynthesisand Respiration
Respiration and Carbon Dioxide
Materials
2 straws
2 plastic cups
Timer
Bromthymol Blue solution
Paper towels
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Comparing Photosynthesisand Respiration
Respiration and Carbon Dioxide
Procedure
Label one cup 1 and the other cup 2
Fill both cups to the marked line with BTB
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Comparing Photosynthesisand Respiration
Respiration and Carbon Dioxide
Procedure
Record the color in both cups on your lab sheet
Place a straw in cup 1
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Comparing Photosynthesisand Respiration
Respiration and Carbon Dioxide
Procedure
Have a group member blow through the straw into
the solution until it changes color
Have a group member time how long it takes for
the solution to change color
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Comparing Photosynthesisand Respiration
Respiration and Carbon Dioxide
Procedure
Record how long it took for the solution to
change color on your lab sheet
Remember the solution is changing color because
you are exhaling carbon dioxide into it
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Comparing Photosynthesisand Respiration
Respiration and Carbon Dioxide
Procedure
Predict how long it would take the solution to
change color after exercise
Record your prediction on your lab sheet
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Comparing Photosynthesisand Respiration
Respiration and Carbon Dioxide
Procedure
Design an experiment to test your prediction
This means a group member must do some form of
exercise (like jumping jacks)
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Comparing Photosynthesisand Respiration
Respiration and Carbon Dioxide
Procedure
The exercise should be something you can do in
place near your tables
Only one group member will perform the exercise
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Comparing Photosynthesisand Respiration
Respiration and Carbon Dioxide
Procedure
Write down the steps of your experiment
Get your teachers approval BEFORE you begin your
experiment
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Comparing Photosynthesisand Respiration
Respiration and Carbon Dioxide
Procedure
Follow the directions in the Analyze and Conclude
section of your lab sheet to conduct your
experiment and record your results