practical: transpiration Flashcards
2.58
1
Q
what is the potometer used for?
A
to measure the rate of water uptake from a leafy shoot
2
Q
why does the potometer need to be set up under water?
A
prevents any air bubbles from entering the system and blocking the xylem
3
Q
why do you need to grease the joint with petroleum jelly?
A
prevents water loss and air entry
4
Q
how to measure the transpiration rate?
A
- distance the bubble travels in 5 minutes
- take a number of readings and calculate a mean rate
