RP3: Osmosis Flashcards
1
Q
How is a graph used to find concentration of plant tissue?
A
- plot a curve/graph of percentage change in mass against concentration
- find the x intercept
2
Q
What happens to the mass of plant tissue when it is in a hypotonic solution?
A
water moves into the tissue by osmosis, so mass increases
3
Q
What happens to the mass of plant tissue when it is in a hypertonic solution?
A
water moves out of the tissue by osmosis, so mass decreases
4
Q
Why is the sample left in the solution for 15 minutes?
A
- allow time for osmosis
- until equilibrium is reached
5
Q
How does water potential change with solute concentration?
A
as solute concentration decreases, water potential increases
6
Q
Why is % change used rather than change in actual mass?
A
- samples may not have the same mass
- allow comparison
7
Q
Why are samples dabbed after being removed from the solution?
A
remove excess water clinging to the surface
8
Q
What are the control variables for this practical?
A
- surface area of potato
- volume of sucrose solution
- time left in solution
- temperature
