4 original questions from New Regents. The worksheet, answer key, and browser practice are free.
Finding What Limits a Model Algae Bed 4 questions
Finding What Limits a Model Algae Bed
Base your answers on the information provided and your knowledge of chemistry. Use the 2025 Chemistry Reference Tables as needed.
A pond exhibit uses a simulated algae bed. Its output is the net volume of oxygen added to the water each minute. The simulation holds temperature, algae amount, and all other settings fixed while changing light and dissolved carbon dioxide.
| Run | Light setting | Carbon dioxide setting | Net oxygen added (mL/min) |
|---|---|---|---|
| P | Low | Low | 2 |
| Q | High | Low | 2 |
| R | Low | High | 3 |
| S | High | High | 8 |
Question 1
Which pair isolates the effect of light when carbon dioxide is high?
- P and Q
- P and R
- Q and S
- R and S
Question 2
Use both carbon dioxide settings to evaluate the claim that extra light always increases net oxygen output.
Write your answer and work on the printable worksheet, or answer online.
Question 3
Explain why the class tested a carbon dioxide setting when modeling oxygen output from photosynthesis.
Write your answer and work on the printable worksheet, or answer online.
The class adds a medium carbon dioxide setting. It wants to know whether extra light helps at this setting.
Question 4
Describe the two new trials the class should compare and the observation that would answer its question.
Write your answer and work on the printable worksheet, or answer online.
2025 Chemistry Reference Tables · Browse Chemistry worksheets