osmosis

Question 1

what is osmosis?

Answer 1

net movement of water across a partially permeable membrane from a high to low water potential (down the water potential gradient)

Question 2

what is osmosis?

Answer 2

net movement of water across a partially permeable membrane from a high to low water potential (down the water potential gradient)

Question 3

what is water potential measured in?

Answer 3

measured in kpa

Question 4

what does pure water have?

Answer 4

the highest water potential of 0kpa

Question 5

what happens when solutes are added to a solution?

Answer 5

the water potential decreases (water potential becomes more negative)

Question 6

water are the three catergories based on their water potential relative to a cell?

Answer 6

Hypotonic ( less solute, higher water potential), Isotonic ( equal solute, same water potential), Hypertonic (more solute, lower water potential )

Question 7

what happens in a isotonic solution?

Answer 7

there is no net movement and an equal volume of water enters and leave the cell

Question 8

what happens in an hypotonic solution?

Answer 8

there is a net movement into the cell and more water enters the cell than leaves. (could cause the cell to swell)

Question 9

what happens in hypertonic solutions?

Answer 9

there is a net movemnt out of the cell and more water leaves the cell than enters, could cause the cell to shrink

Question 10

what is water potential?

Answer 10

the ability of water molecules to leave a solution

Question 11

How do you perform the osmosis potato practical?

Answer 11

1. cut potato cylinder (3cm)
2. measure length and mass
3. add different concentrations of distilled water & sugar solution to six test tubes.
4. add potato cylinder in each for awhile
5. remove, dry and re measure
   6.write data and re measure