osmosis

Question 1

what is water potential

Answer 1

this is the chance that water molecules will move into or out of the cell

Question 2

what is water potential measured in

Answer 2

kilopascals

Question 3

what water potential does water have

Answer 3

0

Question 4

what does a more negative water potential mean

Answer 4

a more concentrated solution

Question 5

what does it mean by the term isotonic

Answer 5

this is when two solutions have the same water potential

Question 6

what happens to an animal cell in pure water (hypotonic solution)

Answer 6

cell will swell up and burst - this is known as lysed

Question 7

what happens to a plant cell when in pure water (hypotonic solution)

Answer 7

they swell but do not burst due to their cell wall
their vacuole swell up causing the membrane to push against the cell wall
this is known as turgid

Question 8

what happens to an animal and plant cell in an isotonic solution

Answer 8

they both remain normal because there is no net movement of water

Question 9

what happens to an animal cell in a concentrated solution (hypertonic)

Answer 9

water will move out of the cell and therefore it will shrink

Question 10

what happens to a plant cell when placed in a concentrated hypertonic solution

Answer 10

they do not shrink but their vacuoles will
eventually their cell membrane will pull away from the cell wall
this is known as plasmolysis

Question 11

what are the factors affecting osmosis

Answer 11

1. water potential gradient
2. membrane thickness
3. surface area

Question 12

osmosis summary note to remember

Answer 12

water has a water potential of 0
the more negative a potential of a solution is the more concentrated it is
any solution that is dissolved in water will have a more negative water potential