Osmosis

Question 1

What is osmosis?

Answer 1

The net diffusion of water across a partially permeable membrane from one solution to a more concentrated one with a lower water potential

Question 2

What happens if a substance is dissolved in water?

Answer 2

The kinetic energy of the water molecules i lowered because some water molecules aggregate on the surface of other water molecules

Question 3

What is water potential?

Answer 3

A measure of water molecules potential for movement in a solution

Question 4

Where does water move?

Answer 4

By osmosis from a less negative to a more negative water potential

Question 5

What is the highest possible water potential?

Answer 5

0 which is pure water

Question 6

What is the water potential of any solution?

Answer 6

It is always negative

Question 7

What is water potential measured in?

Answer 7

Pa

Question 8

What is the effect on red blood cells if they are place in distilled water?

Answer 8

They burst

Question 9

What is the effect on red blood cells if they are place in concentrated salt solution?

Answer 9

The cells will shrink and shrivel

Question 10

What is haemolysis?

Answer 10

A blood cell bursting

Question 11

What is crenation?

Answer 11

A cell crumpling

Question 12

What is the effect of net osmosis?

Answer 12

Water will move into the cell from the solution down the water potential gradient

Question 13

What direction does water move in?

Answer 13

Always down the water potential gradient

Question 14

What does isotonic mean?

Answer 14

The solutions are of equal water potential

Question 15

What is the effect on plant cells if they are place in concentrated salt solution?

Answer 15

The cell body shrinks and pulls away from the cell wall

Question 16

What is the effect on plant cells if they are place in distilled water?

Answer 16

The cell stiffens but generally retains shape

Question 17

What does turgid mean?

Answer 17

Plant cell stiffening and not bursting

Question 18

What is plasmolysis?

Answer 18

A plant cell crumpling

Question 19

What happens when the cell body shrinks?

Answer 19

The cell’s cytoplasm loses volume and salt solution moves past the cell wall outside the membrane.

Question 20

What happens if a cell has a less negative water potential?

Answer 20

Water will move out of the cel by the net movement of osmosis and the cell will experience plasmolysis

Question 21

What happens if a cell has a more negative water potential?

Answer 21

Water will move into the cell by the net movement of osmosis and the cell will become turgid