practical: gas exchange in plants Flashcards
2.45
1
Q
what indicator do we use in this experiment?
A
sodium hydrogen- carbonate
2
Q
what does the indicator show in this experiment?
A
the changes in carbon dioxide concentration in the air surrounding leaves in different light concentrations
3
Q
what colour is sodium hydrogen- carbonate indicator normally?
A
red/ orange
4
Q
what are each of the 4 tubes?
A
- one tube is placed in bright light
- one is wrapped in foil
- one is wrapped in tissue paper (weak light)
- one has a dead leaf with bright light
5
Q
how long are the tubes left for?
A
40 minutes
6
Q
what will happen to the tube with bright light?
A
- respiration > photosynthesis
- CO2> O2
- red -> orange
7
Q
what will happen to the tube wrapped in foil?
A
- respiration = photosynthesis
- CO2 = O2
- stays red/ orange
8
Q
what will happen to the tube wrapped in tissue paper?
A
- respiration < photosynthesis
- CO2< O2
- red -> purple
9
Q
what will happen to the tube with the dead plant and bright light?
A
- no respiration or photosynthesis
- stays red/ orange
