Biology: Potometer Flashcards
1
Q
Why is the rubber bung being sealed with petroleum jelly important?
A
-watertight -airtight -no air bubbles in, no water in
2
Q
Why is the plant sample cut underwater?
A
-prevent entry of water -evaporation creates negative pressure which generates pull
3
Q
Where does the potometer equipment need to be during preparation?
A
completely submerged underwater
4
Q
What is the need for the reservoir?
A
allows air bubble to be pushed back to restart investigation
5
Q
How is one introduced into the potometer?
A
remove capillary tube from beaker for short period of time
6
Q
How is rate calculated?
A
volume of cylinder is pi.r^2 x l
divide by time to travel
