Respiring Seeds - Practical Skills Flashcards
1
Q
How is the release of heat from respiring seeds measured?
A
- Place seeds with moist cotton wool in a thermoflask
- Measure temperature at the start of the practical and after a few days
2
Q
How is the control set up for investigating the release of heat?
A
Set up another thermoflask with boiled seeds and measure any temperature change
3
Q
Why are boiled seeds used for the control?
A
Boiling seeds cannot respire, so it shows that any further change in the temperature using the live seeds are due to respiration
4
Q
Which reagent can be used to indicate carbon dioxide level?
A
Hydrogen carbonate indicator
5
Q
What is the change in the carbon dioxide content of air released from the respired seeds and why?
A
Carbon dioxide is released during the respiration of the seeds
6
Q
What is the function of sodium hydroxide in the practical set-up?
A
To act as a carbon dioxide absorbent
