Osmosis

Question 1

osmosis

Answer 1

the diffusion of water molecules across a selectively permeable membrane from a region of higher water potential to a region of lower water potential.

Question 2

water potential

Answer 2

• the tendency of water to move to a lower
  concentrated area
• measured in Kilopascals
• pure water has a water potential of 0kPa
  - has the highest energy
  - highest tendency to leave

Question 3

solute potential

Answer 3

• measures how easily water moves out of a
  solution
• as solute concentration increases the solute
  potential decreases
  - water is pulled in by the solute, and so
  becomes harder for the water molecules
  to leave.

Question 4

pressure potential

Answer 4

• in plant cells only
• is the pressure exerted onto the cell wall by the
  cell contents

Question 5

osmosis in animal cells

Answer 5

• no cell wall
• no pressure potential
• water potential is equal to the solute potential