Now that you have learned about photosynthesis, you will plan two simple investigations to show that plants use carbon dioxide and release oxygen during the process. In Investigation 1, you will show that carbon dioxide is taken in by plants. In Investigation 2, you will show that oxygen is released. You will also measure how fastthe amount of light effects the oxygen that is released during photosynthesis. Both investigations will use Elodea, a plant that grows in water and is often found in aquariums.
Investigation 1: Demonstrating Carbon Dioxide Uptake by Plants
Objective: To show that Elodea plants take in carbon dioxide during photosynthesis.
Materials:
1. Elodea plant (available at aquarium stores)
2. Clear glass container or beaker
3. Water
4. Sodium bicarbonate (baking soda)
5. Straw or pipette
6. Light source (e.g., desk lamp)
7. Stopwatch or timer
8. pH indicator solution (optional)
Procedure:
1. Fill the glass container or beaker with water.
2. Place the Elodea plant inside the container, ensuring it is fully submerged in water.
3. Dissolve a small amount of sodium bicarbonate (baking soda) in the water to provide a source of carbon dioxide.
4. Observe the Elodea plant under normal room light for a few minutes and note any changes.
5. Slightly blow air into the straw or pipette to add an extra amount of carbon dioxide close to the plant (optional).
6. Observe the plant for an additional few minutes and note any changes.
7. Measure the elapsed time it takes for the plant to show signs of increased oxygen production, such as the formation of bubbles.
8. For an optional confirmation, add a few drops of pH indicator solution to the water and observe any changes in pH due to carbon dioxide uptake.
9. Record your observations and results.
Prediction: The Elodea plant will show increased oxygen production when provided with additional carbon dioxide.
Investigation 2: Demonstrating Oxygen Release during Photosynthesis
Objective: To show that Elodea plants release oxygen during photosynthesis.
Materials:
1. Elodea plant (available at aquarium stores)
2. Clear glass container or beaker
3. Water
4. Sodium bicarbonate (baking soda)
5. Light source (e.g., desk lamp)
6. Gas syringe or gas collection system (e.g., inverted test tube in a water bath)
7. Stopwatch or timer
Procedure:
1. Fill the glass container or beaker with water.
2. Place the Elodea plant inside the container, ensuring it is fully submerged in water.
3. Dissolve a small amount of sodium bicarbonate (baking soda) in the water to provide a source of carbon dioxide.
4. Set up the gas syringe or gas collection system, making sure it is airtight and securely connected to the container.
5. Ensure the Elodea plant is exposed to a controlled light source, such as a desk lamp, for consistent illumination.
6. Start the stopwatch or timer and record the initial volume of gas collected in the syringe or collection system.
7. Allow the Elodea plant to undergo photosynthesis for a specific duration of time (e.g., 30 minutes).
8. Stop the timer and record the final volume of gas collected.
9. Calculate the difference in volume of gas collected, which represents the amount of oxygen released.
10. Repeat the experiment with different intensities of light (e.g., placing the plant at varying distances from the light source) to measure the effect on oxygen release.
11. Record your observations and results.
Prediction: The Elodea plant will release oxygen, and the rate of oxygen release will be influenced by the intensity of light.
Note: Ensure safety precautions are taken throughout the experiments, such as avoiding excessive light exposure or inhalation of chemicals.
can you make this sound like a 7th grader?
Investigation 1: Finding Out How Plants Breathe In Carbon Dioxide
Purpose: To show that plants like Elodea take in carbon dioxide during photosynthesis.
Stuff you'll need:
1. Elodea plant (you can get it from a fish tank store)
2. A see-through glass container or beaker
3. Water
4. Baking soda (also called sodium bicarbonate)
5. A straw or pipette
6. A lamp or any light source
7. A timer or stopwatch
8. Optional: Something to test pH with (like special liquid)
What to do:
1. Put water in the glass container or beaker.
2. Put the Elodea plant in the water, making sure it's completely covered.
3. Dissolve a small amount of baking soda in the water. This gives the plant carbon dioxide to use.
4. Look at the plant without any extra light for a few minutes. See if anything changes.
5. Blow gently into the straw or pipette to add some extra carbon dioxide near the plant (you don't have to do this, but it might help).
6. Watch the plant for a few more minutes and see if anything changes.
7. Time how long it takes for the plant to start making bubbles or showing signs of more oxygen. Use the timer or stopwatch for this.
8. If you want to be extra sure, add a few drops of the special liquid to the water. Check if the pH changes because of the carbon dioxide the plant takes in.
9. Write down what you see and anything interesting.
Guess what might happen: The Elodea plant will probably make more oxygen when given extra carbon dioxide.
Investigation 2: Discovering Oxygen Release during Photosynthesis
Purpose: To show that plants release oxygen during photosynthesis.
Stuff you'll need:
1. Elodea plant (you can get it from a fish tank store)
2. A see-through glass container or beaker
3. Water
4. Baking soda (also called sodium bicarbonate)
5. A lamp or any light source
6. A thing to collect gas, like a syringe or an upside-down test tube in a bowl of water
7. A timer or stopwatch
What to do:
1. Put water in the glass container or beaker.
2. Put the Elodea plant in the water, making sure it's completely covered.
3. Dissolve a small amount of baking soda in the water. This gives the plant carbon dioxide to use.
4. Set up the gas collector thingy, so it's closed and connected to the container tightly.
5. Make sure the Elodea plant gets light from a lamp or something. Keep it consistent and the same distance from the plant.
6. Start the timer or stopwatch and write down how much gas is in the collector thingy at the beginning.
7. Let the Elodea plant do its photosynthesis thing for a certain amount of time, like 30 minutes.
8. Stop the timer and see how much gas collected in the collector thingy at the end.
9. Figure out the difference in the gas volume. That's how much oxygen the plant let out.
10. Try the experiment again but change the light's brightness or distance from the plant. See how it affects oxygen release.
11. Write down what you see and any cool things you notice.
Guess what might happen: The Elodea plant will give off oxygen, and how much oxygen it releases might change with different amounts of light.
Remember to be safe and follow any safety rules, like being careful with light or chemicals.
Write a lab report to help you summarize and organize your thoughts about your two investigations. In your lab report, tell how you conducted the investigations, what data you collected, and what you concluded.
Title: Investigating Photosynthesis: Carbon Dioxide Uptake and Oxygen Release by Elodea Plants
Abstract:
This lab report presents the findings of two investigations conducted to demonstrate the process of photosynthesis in plants. Investigation 1 aimed to show that Elodea plants take in carbon dioxide, while Investigation 2 focused on demonstrating the release of oxygen during photosynthesis. The experiments were conducted using Elodea plants submerged in water and exposed to controlled light sources. Carbon dioxide was provided by dissolving baking soda in the water. The data collected included observations of plant behavior and the measurement of gas volumes. Based on the results, it was concluded that Elodea plants effectively utilize carbon dioxide during photosynthesis, resulting in the production of oxygen.
Introduction:
Photosynthesis is a vital process in which plants harness energy from sunlight and convert it into chemical energy in the form of glucose. This process involves the absorption of carbon dioxide and the release of oxygen. In this lab, two investigations were designed to provide evidence for these processes using Elodea, an aquatic plant commonly found in aquariums.
Methods:
Investigation 1 - Demonstrating Carbon Dioxide Uptake:
1. A glass container was filled with water, and an Elodea plant was submerged.
2. A small amount of baking soda was dissolved in the water to serve as a source of carbon dioxide.
3. The Elodea plant was observed under ambient light conditions.
4. Additional carbon dioxide was introduced by gently blowing into a straw near the plant (optional).
5. Observations were recorded, and the time for increased oxygen production, such as the formation of bubbles, was measured.
6. To confirm carbon dioxide uptake, pH indicator solution was added to the water, noting any pH changes.
Investigation 2 - Demonstrating Oxygen Release:
1. A glass container was filled with water, and an Elodea plant was submerged.
2. Baking soda was dissolved in the water to provide carbon dioxide for photosynthesis.
3. A gas collection system, such as a syringe or an inverted test tube in a water bath, was used to measure oxygen release.
4. The Elodea plant was exposed to a controlled light source at a consistent intensity.
5. The initial gas volume was recorded, and the duration of photosynthesis was timed (e.g., 30 minutes).
6. The final gas volume was measured and the difference calculated as the amount of oxygen released.
7. The experiment was repeated with varying light intensities to observe the effect on oxygen release.
Results:
Investigation 1 - Carbon Dioxide Uptake:
Observations revealed that the Elodea plant showed increased oxygen production when additional carbon dioxide was provided. The time for the appearance of bubbles varied based on the presence of supplementary carbon dioxide. The pH indicator solution demonstrated a decrease in pH, confirming carbon dioxide uptake.
Investigation 2 - Oxygen Release:
The Elodea plant released oxygen during photosynthesis, as evidenced by the increase in gas volume in the collection system. The duration of photosynthesis affected the amount of oxygen released, with a longer exposure resulting in higher oxygen levels. Furthermore, altering the light intensity influenced the rate of oxygen release, with higher intensities leading to more significant volumes in a given timeframe.
Conclusion:
Through Investigation 1, it was observed that Elodea plants effectively take in carbon dioxide during photosynthesis, as indicated by increased oxygen production and changes in pH. Investigation 2 provided clear evidence for the release of oxygen by the Elodea plants during photosynthesis. The rate of oxygen release was influenced by the duration of photosynthesis and the intensity of the light source. These experiments affirm the importance of carbon dioxide uptake and oxygen release during the photosynthesis process in plants.
can you make it short and sound like a 7th grader
Title: Investigating How Plants Breathe In and Give Out Oxygen
Introduction:
Plants have a super cool power called photosynthesis, where they make food and release oxygen. We did two investigations to see how this process works using Elodea plants. In Investigation 1, we wanted to see if plants take in carbon dioxide. In Investigation 2, we wanted to see if plants release oxygen. We used Elodea because it's a water plant that's often found in fish tanks.
Methods:
For Investigation 1, we put the Elodea plant in water and added baking soda to give it carbon dioxide. We watched the plant under regular light and blew some extra carbon dioxide near it. We timed how long it took for the plant to make more oxygen.
For Investigation 2, we again put the Elodea plant in water with added baking soda. We used a special thing to collect the gas and measured how much oxygen the plant released. We changed the brightness of the light to see if it affected how much oxygen the plant gave out.
Results:
In Investigation 1, we saw that when we added extra carbon dioxide, the Elodea plant made more oxygen. It started making bubbles faster too. We tested the water with a special liquid, and it showed that the plant used up carbon dioxide.
In Investigation 2, the Elodea plant released oxygen, and the more time it had to do photosynthesis, the more oxygen it gave out. Also, when we made the light brighter, the plant made more oxygen.
Conclusion:
Our investigations showed that plants like Elodea need carbon dioxide to make oxygen during photosynthesis. When they have more carbon dioxide, they make more oxygen. Also, the longer they have light to do photosynthesis, the more oxygen they release. So, plants are like little oxygen factories!