movement of substances

Question 1

3 ways that substances can move in

Answer 1

active transport, osmosis and diffusion

Question 2

definition of diffusion

Answer 2

• net movement of particles
• from a region where they are of higher concentration to a region of lower concentration
• down the concentration gradient

Question 3

definition of osmosis

Answer 3

• net movement of water particles
• from a region where they are of higher concentration to a region of lower concentration
• down the water concentration gradient
• across a partially permeable membrane

Question 4

what will happen to an animal cell in a solution with high water potential

Answer 4

1) The solution outside the cell has a higher water potential than the cytoplasm of the cell.
2) There is a net movement of water molecules into the cell-
3) by osmosis.
4) The cell gains water molecules, swells and bursts.

Question 5

what will happen to an animal cell in a solution with low water potential?

Answer 5

1) the solution outside the cell has a lower water potential than the cytoplasm of the cell.
2) There is a net movement of water molecules out of the cell -
3) by osmosis.
4) The cell loses water molecules, shrinks and becomes crenated.

Question 6

what happens to a plant cell in a solution with high water potential?

Answer 6

1) the solution outside the cell has higher water potential than the cytoplasm of the plant cell.
2) there is a net movement of water molecules into the cell
3) by osmosis
4) The cell gains water molecules, becomes turgid, because the cell wall is inelastic.

Question 7

What happens to a plant cell in a solution with low water molecules?

Answer 7

1) The solution outside the cell has a lower water potential than the cytoplasm of the plant cell
2) There is a net movement of water molecules out of the cell
3) by osmosis.
4) The cell loses water molecules, becomes flaccid and ends up bring plasmolysed.

Question 8

definition of active transport

Answer 8

• net movement of particles
• from a region of lower concentration to a region of higher concentration
• a