PHOTOSYNTHESIS and RESPIRATION
STUDENT ACTIVITY GUIDE
Name: ____________________________________________________
Date: ________________________
Lesson Presentation Review
1. Describe different ways that organisms obtain energy.
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2. List three examples of the following:
Autotroph - _______________________________________________________________________________________
Heterotroph - _____________________________________________________________________________________
3. Label the equation for photosynthesis.
6 CO2 + 6 H2O
C6H12O6 + 6 O2
4. Describe the two stages of photosynthesis.
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5. Label the equation for respiration.
C6H12O6 + 6 O2
6 CO2 + 6 H2O + energy
6. Describe the two stages of respiration.
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7. Compare and contrast the processes of photosynthesis and respiration.
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8. How is fermentation different than respiration?
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9. Describe the two types of fermentation.
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Interactive Practice Activities
Virtual Lab Investigation: The Effects of Carbon Dioxide & Light on Photosynthesis
Overview
In this virtual lab investigation you will determine how carbon dioxide concentration and light intensity affect the
rate of photosynthesis in the aquatic plant, Elodea. You will measure the rate of photosynthesis by counting the
number of oxygen bubbles that are released from the plant over a period of time.
Review the chemical equation for photosynthesis:
6 CO2 + 6 H2O ➞ C6H12O6 + 6 O2
Hypothesis
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Procedure
1. Prepare the Elodea plant by cutting the stem at an angle and placing it in the beaker. (Click on Prepare
Plant button.)
2. Fill the beaker with the water mixture you would like to use by selecting 0 ppm, 300 ppm, 600 ppm or 1200
ppm. Each mixture has a different concentration of carbon dioxide (CO2), measured in parts per million
(ppm). The 0 ppm mixture is distilled water.
3. Select the light intensity you would like to use (5,000, 15,000 or 25,000 lux).
4. Start the Timer and count the number of oxygen bubbles produced in four minutes. (Note that the speed of
the Timer is simulated.)
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5. Record your data in the table below.
6. Repeat the procedure and select a different water mixture and/or light intensity. Be sure to test each
combination of these two variables.
Data and Observations
Fill in the table with the data you collect.
Light Intensity (lux)
5000
CO2 concentration
(ppm)
15000
25000
0
300
600
1200
Create a bar graph displaying your observations.
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Conclude and Apply
1. Does the data you collected support your hypothesis?
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2. What conclusions can you make about how light affects the rate of photosynthesis?
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3. What conclusions can you make about how the concentration of CO2 affects the rate of photosynthesis?
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4. Name another variable you could change that might affect the rate of photosynthesis.
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Interactive Drag & Drop Activities
Use these activities to
• Practice completing the chemical equations for photosynthesis and respiration
• Label diagrams of the processes
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Photosynthesis
Respiration
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Reviewing Vocabulary
alcoholic fermentation: ______________________________________________________________________________
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ATP: ________________________________________________________________________________________________
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autotroph: __________________________________________________________________________________________
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carbon dioxide: ______________________________________________________________________________________
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cellular respiration: __________________________________________________________________________________
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chlorophyll: _________________________________________________________________________________________
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chloroplast: _________________________________________________________________________________________
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cytoplasm: __________________________________________________________________________________________
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energy: _____________________________________________________________________________________________
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glucose: ____________________________________________________________________________________________
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guard cells: _________________________________________________________________________________________
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heterotroph: ________________________________________________________________________________________
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lactic acid fermentation: _____________________________________________________________________________
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mitochondrion: ______________________________________________________________________________________
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organelle: ___________________________________________________________________________________________
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oxygen: _____________________________________________________________________________________________
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photosynthesis: _____________________________________________________________________________________
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stomata: ____________________________________________________________________________________________
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