Osmosis

Question 1

Define osmosis

Answer 1

the net movement of water molecules across a permeable membrane from an area of higher water potential to an area of lower water potential

Question 2

what is water potential?

Answer 2

the tendency of water molecules to diffuse out or into a solution

Question 3

what water potential value does pure water have?

Answer 3

0 - it has the highest water potential

Question 4

what does isotonic mean?

Answer 4

two solutions have the same water potential

Question 5

what are the three factors that affect the rate of osmosis?

Answer 5

1. the surface area
2. the water potential gradient
3. the thickness of exchange surface

Question 6

how do plant cells react to osmosis in Hypertonic conditions ?

Answer 6

the water potential outside the cell is lower than inside the cell, so water moves out the cell = the cytoplasm pulls away from the cell wall = the cell is flaccid

Question 7

how do plant cells react to osmosis in a hypotonic conditions?

Answer 7

the water potential outside the cell is higher than inside the cell = water moves into the cell = cytoplasm pushes against the cell wall = cell becomes turgid

Question 8

How do animal cells react to osmosis in a hypotonic condition?

Answer 8

the water potential is higher outside the cell = water moves in the cell = the cell has no protective cell wall, so it bursts.