Investigation 1: Testing Photosynthesis in a Closed System
Materials needed:
1. Two identical potted plants
2. Two clear airtight containers (such as glass jars or plastic bags)
3. Light source (such as a lamp or sunlight)
4. Carbon dioxide (CO2) source (such as dry ice or baking soda and vinegar)
5. pH indicator solution
6. Video recording device
7. Stopwatch or timer
8. Data table or log sheet
Procedure:
1. Place one plant in each clear container.
2. Seal the containers, ensuring they are airtight.
3. Set up the light source to provide consistent light intensity for both plants. Ensure all other environmental conditions (temperature, humidity, etc.) are equal.
4. Start the video recording device to capture the entire experiment.
5. Introduce the carbon dioxide source into one of the containers while carefully avoiding contact with the plants. In case of using dry ice, place it a safe distance from the plants.
6. Observe the plants for a set period (e.g., 30 minutes) and record any visible changes.
7. Take periodic measurements of the pH levels of the air inside each container, using the pH indicator solution.
8. Continue the observation for a predetermined duration (e.g., 2-4 hours)
9. After the observation period, stop the video recording.
10. Analyze the video footage to document any visible changes in the plants, such as leaf movement or changes in color.
11. Record the pH level measurements from each container at regular intervals.
12. Compile the data collected into a table, indicating the time, pH level, and any visible changes observed.
13. Analyze the data to determine outcomes supporting the release of oxygen via photosynthesis by the plant in the container where the CO2 source was introduced.
Investigation 2: Demonstrating Oxygen Production via Photosynthesis
Materials needed:
1. Elodea or any other aquatic plant
2. Sodium bicarbonate (baking soda)
3. Water
4. Beaker or glass container
5. Light source (such as a lamp or sunlight)
6. Video recording device
7. Stopwatch or timer
8. Data table or log sheet
Procedure:
1. Fill the beaker or glass container with water.
2. Dissolve a small amount of sodium bicarbonate in the water to provide a source of carbon dioxide.
3. Place the Elodea or other aquatic plant into the water.
4. Set up the light source to provide consistent light intensity for the plant.
5. Start the video recording device to capture the entire experiment.
6. Observe the plant for a predetermined duration (e.g., 1 hour) and record any visible changes.
7. Observe the bubble formation on the plant, which represents oxygen release.
8. Continue the observation for the determined duration.
9. After the observation period, stop the video recording.
10. Analyze the video footage to document any visible changes in the plant, primarily focusing on bubble formation.
11. Record the data on the number of bubbles observed during specific time intervals.
12. Compile the data collected into a table, indicating the time and the number of bubbles observed.
13. Analyze the data to determine outcomes supporting the release of oxygen via photosynthesis by the aquatic plant.
Note: In both investigations, be sure to use proper safety precautions and follow ethical considerations, such as not subjecting the plants to excessively long durations without adequate light or removing excess carbon dioxide when the investigation concludes.
Planning two investigations to show that plants use carbon dioxide and release oxygen during photosynthesis using videos, including what materials you will need, what data you will collect, and what procedures to follow
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