Use the lab report below to Complete the Unit 4 portfolio. This lab report template is based on the lab investigations given in Connexus and will be using the provided videos. Some parts of this lab report have already been filled in for you.
You may want to view this video before you begin to truly understand what this investigation would look like.
**If you plan to perform your own investigation using Elodea, you will need to refer to the Connexus lessons for direct instructions but use this lab report to record the scientific method steps and results.**
Name
Date
Assignment Title: Unit 4 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
Independent Variable
____________________
IF_______________________________________________,
THEN____________________________________________
________________________________________________.
Dependent Variable
____________________
3. Experiment
Control
Materials
Procedures (list steps)
1.
6.
2.
7.
3.
8.
4.
9.
5.
10.
Watch the video in Lesson 4, page 2 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?
Record your data here for your investigation on the absorption of carbon dioxide. You may change the table to fit your investigation if needed.
Content of Test Tube
Color When Left in Light
Color when left in Dark
11
Baking Soda + BTB
2
Baking Soda, BTB, and Elodea
3
Baking Soda, BTB, and Elodea
Which trial performed photosynthesis when left in the light? Which trial performed photosynthesis when left in the dark?
Record your data here for your investigation on the absorption of carbon dioxide. You may change the table to fit your investigation if needed.
Time Elapsed (minutes)
Test Tube 1 – Number of bubbles
Test Tube 2 – Number of Bubbles
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
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?
Conclusion
Did your data support or refute your hypothesis?
- Based on the data collected, my hypothesis was supported. The Elodea plant absorbed carbon dioxide and released oxygen during photosynthesis.
What would you do to improve the experiment in the future?
- In the future, I would increase the sample size and conduct multiple trials to ensure accurate results.
What did you learn about this topic?
- I learned that Elodea plants absorb carbon dioxide and release oxygen during photosynthesis, which is essential for the survival of plants and other organisms that rely on oxygen for respiration.