Title: Recreating the Experiment "Photosynthetic Floatation"
Experiment Objective: To observe the process of photosynthetic floatation in aquatic plants.
Materials:
1. Aquatic plants (e.g., Elodea or Cabomba)
2. Clear container or test tube
3. Water
4. Lamp or light source
5. Sodium bicarbonate (baking soda)
6. Graduated cylinder or measuring cup
7. Stopwatch or timer
Procedure:
1. Preparation:
a. Fill the clear container or test tube with water to about 3/4th of its capacity.
b. Place the container in a well-lit area, preferably near a window or under a lamp.
c. Set up the timer or stopwatch for data collection.
2. Identifying the dependent and independent variables:
Dependent variable: The rate of photosynthetic floatation measured as the number of oxygen bubbles produced.
Independent variable: The presence or absence of sodium bicarbonate (baking soda).
3. Control setup:
a. Begin with a control setup by placing a few stems of the chosen aquatic plant into the container without adding any sodium bicarbonate.
b. Observe and record the rate of photosynthetic floatation by counting the number of oxygen bubbles produced and rising to the surface within a specific time frame (e.g., 5 minutes).
4. Experimental setup:
a. Take another set of aquatic plants and place them in the container with water mixed with a measured amount of sodium bicarbonate (e.g., 1 gram per liter).
b. Ensure the plants are fully immersed in the sodium bicarbonate solution, but avoid overcrowding.
c. Observe and record the rate of photosynthetic floatation by counting the number of oxygen bubbles produced and rising to the surface within the same time frame (e.g., 5 minutes).
5. Repeat the experiment:
a. For more reliable results, repeat steps 3 and 4 for additional trials (at least three times).
b. Take the average of the results obtained from each trial to minimize any possible anomalies.
Hypothesis: If sodium bicarbonate is added to the water during the experiment, then the rate of photosynthetic floatation, measured by the number of oxygen bubbles produced, will be higher compared to the control setup without sodium bicarbonate. This is because sodium bicarbonate provides a carbon source necessary for photosynthesis to occur, leading to increased oxygen production.
Note: It is important to adhere to ethical guidelines and not keep the plants out of water for an extended period to avoid causing harm or stress to the organisms involved. Additionally, ensure proper disposal of any materials used in the experiment, following environmental regulations.
Provide a detailed list of directions on how someone would recreate the experiment Photosynthetic Floatation. Create a prediction on what will happen during the experiment and why. Use the following format to write your hypothesis “If…, then…”. “If” is the independent variable, “then” is the dependent variable that you identified above. (1 pt) Ex. If yeast is added to a flour mixture, then the mixture will rise higher than the mixture without yeast.
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