fill this out.

Question

Name Zane Harrison

Date
Assignment Title: Unit 7 Portfolio: Matter and Energy
Before beginning you MUST watch the video in Lesson 3, page 10. Then, you can complete the first part of this lab report by answering the questions, writing a hypothesis, determining your variables, describing your materials, and listing your procedures. Remember, you don’t actually have to DO this experiment, but you do have to plan as if you are.
Steps of the Scientific Method
1. State the Problem
How much carbon dioxide does the plant Elodea absorb and how much oxygen does it release?
Why are two investigations needed to show gas exchange during photosynthesis?

How will we measure the amount of carbon dioxide that Elodea has absorbed?

How will we measure the amount of oxygen Elodea has released?

2. Hypothesis
My hypothesis is that if more light is in use of the plant, then the Elodea plant will absorb more carbon dioxide and release more oxygen.
Independent Variable

____________________

IF The independent variable is the amount of light provided,

THEN

the dependent variable is the amount of carbon dioxide absorbed and oxygen released by the Elodea plant.
For the experiment
________________________________________________.
Dependent Variable

____________________

3. Experiment

Control
Materials: we would need the following materials: Elodea plant, beaker, bromothymol blue (BTB) solution, baking soda, light source, timer, test tubes, and a data table.
Procedures (list steps)
1.
6.
2.
7.
3.
8.
4.
9.
5.
10.
Watch the video in Lesson 3, page 10 before moving forward.
4. Describe the data you expect to collect in this investigation by answering the questions. You can also insert a sample data table if you wish.

How will you determine whether photosynthesis has occurred? What color does BTB make the water to begin with? What color do you expect the water to be IF photosynthesis has occurred?
Answer the following questions.
If you place an Elodea plant in the BTB + baking soda solution overnight and in the morning it is yellow. What does that mean? Do you think there would be oxygen bubbles present?

Examine the example table to the right and answer the question that follows.

Content of Test Tube
Color When Left in Light
Color when left in Dark
11
Baking Soda + BTB
Yellow
Yellow
2
Baking Soda, BTB, and Elodea
Green
Greenish Yellow
3
Baking Soda, BTB, and Elodea
Green
Yellow

Which trial performed photosynthesis when left in the light? Which trial performed photosynthesis when left in the dark?

Examine the table to the right and answer the following questions.

Time Elapsed (minutes)
Test Tube 1 – Number of bubbles
Test Tube 2 – Number of Bubbles
0
0
0
1
20
23
2
31
31
3
32
35
4
31
32
5
32
33

Make a graph of the number of oxygen bubbles that are released per minute for 5 minutes. Plot the time in minutes on the horizontal axis and the number of bubbles on the vertical access.
If you cannot make the graph directly in this document, you will need to create your graph on paper and then upload a picture. If you cannot get it into this box, add it to the end of this lab report or attach a separate submission to the drop box.

Summarize your lab report by answering the following questions.
5. Conclusion: written explanation of what you learned. This should be one paragraph explaining what you learned about photosynthesis (5-6 sentences, 250 words). Be sure to include ALL required vocab words from the list above and underline them.

Information to include:
Did your data support or refute your hypothesis?
What would you do to improve the experiment in the future?
What did you learn about this topic?

Answer 1

Name: Zane Harrison
Date:
Assignment Title: Unit 7 Portfolio: Matter and Energy

Before beginning you MUST watch the video in Lesson 3, page 10. Then, you can complete the first part of this lab report by answering the questions, writing a hypothesis, determining your variables, describing your materials, and listing your procedures. Remember, you don’t actually have to DO this experiment, but you do have to plan as if you are.

Steps of the Scientific Method

1. State the Problem
How much carbon dioxide does the plant Elodea absorb and how much oxygen does it release?
Why are two investigations needed to show gas exchange during photosynthesis?

How will we measure the amount of carbon dioxide that Elodea has absorbed?
How will we measure the amount of oxygen Elodea has released?

2. Hypothesis
My hypothesis is that if more light is in use of the plant, then the Elodea plant will absorb more carbon dioxide and release more oxygen.

Independent Variable
IF The independent variable is the amount of light provided,
THEN the dependent variable is the amount of carbon dioxide absorbed and oxygen released by the Elodea plant.

Dependent Variable

Experiment
Control

Materials: We would need the following materials: Elodea plant, beaker, bromothymol blue (BTB) solution, baking soda, light source, timer, test tubes, and a data table.

Procedures (list steps)
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.

Watch the video in Lesson 3, page 10 before moving forward.

4. Describe the data you expect to collect in this investigation by answering the questions. You can also insert a sample data table if you wish.

How will you determine whether photosynthesis has occurred? What color does BTB make the water to begin with? What color do you expect the water to be IF photosynthesis has occurred?
Answer the following questions.
If you place an Elodea plant in the BTB + baking soda solution overnight and in the morning it is yellow. What does that mean? Do you think there would be oxygen bubbles present?

Examine the example table to the right and answer the question that follows.

Content of Test Tube Color When Left in Light Color when left in Dark
1 Baking Soda + BTB Yellow Yellow
2 Baking Soda, BTB, and Elodea Green Greenish Yellow
3 Baking Soda, BTB, and Elodea Green Yellow

Which trial performed photosynthesis when left in the light? Which trial performed photosynthesis when left in the dark?

Examine the table to the right and answer the following questions.

Time Elapsed (minutes) Test Tube 1 – Number of bubbles Test Tube 2 – Number of Bubbles
0 0 0
1 20 23
2 31 31
3 32 35
4 31 32
5 32 33

Make a graph of the number of oxygen bubbles that are released per minute for 5 minutes. Plot the time in minutes on the horizontal axis and the number of bubbles on the vertical axis.
If you cannot make the graph directly in this document, you will need to create your graph on paper and then upload a picture. If you cannot get it into this box, add it to the end of this lab report or attach a separate submission to the drop box.

Summarize your lab report by answering the following questions.

5. Conclusion: written explanation of what you learned. This should be one paragraph explaining what you learned about photosynthesis (5-6 sentences, 250 words). Be sure to include ALL required vocab words from the list above and underline them.

Information to include:
Did your data support or refute your hypothesis?
What would you do to improve the experiment in the future?
What did you learn about this topic?