Gas Exchange in Plants - Practical Skills Flashcards
1
Q
What is the function of the hydrogen carbonate indicator?
A
We use this indicator to measure carbon dioxide levels
2
Q
What colour is hydrogen carbonate indicator at atmospheric CO2 levels?
A
Red
3
Q
What colour is hydrogen carbonate at low CO2 levels?
A
Magenta/purple
4
Q
What colour is hydrogen carbonate indicator at high CO2 levels?
A
Orange/yellow
5
Q
What colour would you expect the indicator to be when the pondweed is close to the light source?
A
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
