Use the lab report below to Complete the Unit 7 portfolio. This lab report 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. Be sure to write 1-2 complete sentences when answering questions. One word answers will not provide full credit.
You may want to view this video before you begin to truly understand what this investigation would look like.
Name
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 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 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.
A. 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?
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?
Two investigations are needed to show gas exchange during photosynthesis because photosynthesis involves the absorption of carbon dioxide and the release of oxygen. In order to accurately measure the amount of carbon dioxide absorbed and the amount of oxygen released, separate investigations must be conducted.
How will we measure the amount of carbon dioxide that Elodea has absorbed?
The amount of carbon dioxide that Elodea has absorbed can be measured by using bromothymol blue (BTB) as an indicator. BTB turns yellow in the presence of carbon dioxide.
How will we measure the amount of oxygen Elodea has released?
The amount of oxygen Elodea has released can be measured by counting the number of oxygen bubbles produced by the plant.
2. Hypothesis
Independent Variable: Presence of light
IF the Elodea plant is exposed to light,
THEN it will absorb more carbon dioxide and release more oxygen.
Dependent Variable: Amount of carbon dioxide absorbed and amount of oxygen released.
3. Experiment
Control: BTB solution without Elodea
Materials: Elodea plant, BTB solution, baking soda, test tubes
Procedures:
1. Prepare a BTB solution by adding baking soda to the solution.
2. Pour the BTB solution into test tubes.
3. Place Elodea plants in some of the test tubes.
4. Place the test tubes with Elodea in a well-lit area and the test tubes without Elodea in a dark area.
5. Observe and record the color of the BTB solution in each test tube over a period of time.
6. Count the number of oxygen bubbles released by the Elodea plants at different time intervals.
4. The data expected to be collected in this investigation includes:
- The initial color of the BTB solution in each test tube.
- The color of the BTB solution after a certain period of time.
- The number of oxygen bubbles released by the Elodea plants at different time intervals.
A. 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?
To determine whether photosynthesis has occurred, we will observe the color of the BTB solution. BTB makes the water greenish-yellow to start with. If photosynthesis has occurred, we expect the water to remain greenish-yellow or turn green.
If an Elodea plant placed in the BTB + baking soda solution overnight is yellow in the morning, it means that photosynthesis has occurred. We think there would be oxygen bubbles present in this case.
The trial that performed photosynthesis when left in the light is Trial 2 (Baking Soda, BTB, and Elodea). The trial that performed photosynthesis when left in the dark is Trial 3 (Baking Soda, BTB, and Elodea).
The graph of the number of oxygen bubbles released per minute for 5 minutes will show the time in minutes on the horizontal axis and the number of bubbles on the vertical axis.
5. Conclusion:
The data supported the hypothesis that the presence of light would result in the absorption of more carbon dioxide and the release of more oxygen by the Elodea plant. In the investigation, the BTB solution remained greenish-yellow or turned green when photosynthesis occurred. The presence of oxygen bubbles also indicated the occurrence of photosynthesis.
To improve the experiment in the future, more trials could be conducted to increase the reliability of the results. Additionally, controlling factors such as temperature and light intensity could provide a more accurate understanding of the impact on photosynthesis.
Through this investigation, I learned that photosynthesis is a process in which plants absorb carbon dioxide and release oxygen. The presence of light is essential for photosynthesis to occur. The use of indicators such as BTB can help determine the occurrence of photosynthesis by detecting the presence of carbon dioxide. The release of oxygen bubbles serves as further evidence of photosynthesis.
whts the rest of the procedure's steps
The remaining procedure steps are as follows:
7. Observe and record the color of the BTB solution in each test tube every 5 minutes for a total of 30 minutes.
8. Count the number of oxygen bubbles released by the Elodea plants in each test tube at the end of the 5-minute intervals.
9. Repeat the observations and bubble counts for each test tube over the 30-minute period.
10. Compile the data collected and use it to create a graph showing the number of oxygen bubbles released per minute for each test tube.
These steps will allow for the observation and measurement of the amount of carbon dioxide absorbed and the amount of oxygen released by the Elodea plant over time.
wht the answer to this 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?
If an Elodea plant placed in the BTB + baking soda solution overnight is yellow in the morning, it means that the plant has undergone photosynthesis. This indicates that the plant has absorbed carbon dioxide and released oxygen during the process of photosynthesis. Therefore, it is likely that there would be oxygen bubbles present in the solution.
can u 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.
I apologize, but as a text-based AI, I am unable to create visual content like graphs. However, I can guide you on how to create the graph.
To create the graph of the number of oxygen bubbles released per minute for 5 minutes, follow these steps:
1. Prepare a graph with two axes. The horizontal axis represents time in minutes, and the vertical axis represents the number of bubbles.
2. Mark the horizontal axis with values from 0 to 5, indicating the time intervals at which the observations were made (e.g., 0, 1, 2, 3, 4, 5).
3. Mark the vertical axis with appropriate increments to accommodate the range of the number of bubbles observed.
4. Plot points on the graph based on the data collected. For each time interval, indicate the corresponding number of oxygen bubbles released.
5. Connect the plotted points with a line to visualize the trend of the data over the 5-minute period.
Note: If you are unable to create the graph directly in a digital document, you can create it on paper and then take a picture or scan it to include in your lab report. Alternatively, you can use graphing software or online tools to create the graph and then insert it into your document.
wht the hypothisesis
Based on the information provided, the hypothesis for the experiment could be:
IF the Elodea plant is exposed to light,
THEN it will absorb more carbon dioxide and release more oxygen.
The independent variable in this hypothesis is the presence of light, while the dependent variables are the amount of carbon dioxide absorbed and the amount of oxygen released by the Elodea plant.