CPAC 10- Flashcards
1
Q
Why is sodium hydrogen carbonated added?
A
to provide CO2 for photosynthesis
2
Q
What does the volume of gas produced indicate?
A
- assumed to be oxygen
- so volume of gas is proportional to rate of photosynthesis
3
Q
What are the control variables of this experiment?
A
- temperature
- mass/concentration of sodium hydrogen carbonate
- length or mass of pondweed
- light intensity (distance from lamp)
- time allowed for gas collection
- volume of water
4
Q
How is the colour of light changed?
A
using different coloured filters
