9.4 OXYGEN BUBBLES

Question 1

What is the independent variable of the oxygen bubble experiment?

Answer 1

Distance between pondweed and light source

Question 2

What is the dependent variable of the oxygen bubble experiment?

Answer 2

Number of bubbles produced per minute

Question 3

What is the controlled variables of the oxygen bubble experiment?

Answer 3

1. Type of plant
2. Time taken to count bubbles
3. Type of light source
4. Concentration of CO2
5. Temperature of water
6. Volume of water
7. Size of plant
8. pH of water