gas exchange in plants Flashcards
1
Q
what is the reagent used to measure carbon dioxide levels
A
hydrogen carbonate indicator
2
Q
what color is hydrogen carbonate indicator at atmospheric CO2 levels
A
red
3
Q
what color is hydrogen carbonate indicator at low CO2 levels
A
magenta/purple
4
Q
what color is hydrogen carbonate indicator at high CO2 levels
A
orange/yellow
5
Q
what color is pondweed when close to the light source
A
its purple, CO2 levels low as photosynthesis rate is high, net uptake of CO2
6
Q
what are the controlled variables for this practical
A
- volume of hydrogen carbonate indicator
- species of pondweed
- time
- temperature
