Biology · Life Processes
In designing an experiment to demonstrate that carbon dioxide (CO2) is essential for photosynthesis, which setup effectively isolates the variable?
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- 1Using different nutrient compositions of soil mixes to monitor variations in overall plant growth.
- 2Measuring the total volume of gaseous oxygen output released by submerged aquatic water plants.
- 3Comparing the vegetative growth rate of identical plants kept under bright light versus completely dark conditions.
- 4Placing potassium hydroxide (KOH) in one sealed jar with a plant to absorb CO2, while keeping another sealed jar without KOH as a control.✓
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Placing potassium hydroxide (KOH) in one sealed jar with a plant to absorb CO2, while keeping another sealed jar without KOH as a control.
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