Which of the following is the most effective way to measure the effect of different carbon dioxide concentrations on the rate of photosynthesis?

Options

A. Placing same amount of dry ice in similar bell jars kept in sunlight containing different plants.
B. Using different concentrations of sodium hydrogen carbonate solution with same type of immersed water plants in similar bell jars placed in sunlight.
C. Varying light intensity given to different well watered plants placed in similar bell jars kept in sunlight.
D. Varying amount of air provided to different well watered plants placed in similar bell jars kept in sunlight.

Explanation

To determine the most effective way to measure the effect of different carbon dioxide concentrations on the rate of photosynthesis, we can follow these steps:

### Step-by-Step Solution:

1. **Understand Photosynthesis**:
- Photosynthesis is the process by which plants convert carbon dioxide (CO2) and water into glucose and oxygen using sunlight and chlorophyll.

2. **Identify the Variables**:
- The key variable we want to measure is the rate of photosynthesis, which can be influenced by the concentration of carbon dioxide.

3. **Set Up the Experiment**:
- Use a bell-shaped jar as the experimental setup. This jar will help create a controlled environment where we can manipulate the concentration of carbon dioxide.

4. **Introduce Carbon Dioxide Source**:
- Add sodium hydrogen carbonate (NaHCO3) to the water in the jar. This compound will dissolve in water to release carbon dioxide, allowing us to vary its concentration.

5. **Keep Other Variables Constant**:
- Ensure that the amount of water and the type of plant used remain constant throughout the experiment. This is crucial to isolate the effect of carbon dioxide concentration on photosynthesis.

6. **Place in Sunlight**:
- Position the bell jar in sunlight. Sunlight is essential for photosynthesis, and it ensures that the plants have the energy required for the process.

7. **Measure the Rate of Photosynthesis**:
- Observe and measure the amount of glucose produced or the oxygen released over a set period. This will indicate the rate of photosynthesis under different carbon dioxide concentrations.

8. **Analyze the Results**:
- Compare the rates of photosynthesis at different concentrations of carbon dioxide to determine how it affects the process.

### Conclusion:
The most effective way to measure the effect of different carbon dioxide concentrations on the rate of photosynthesis is to use different concentrations of sodium hydrogen carbonate solution with the same type of immersed water plant in similar bell jars placed in sunlight.