Osmosis and Diffusion

Question 1

Definition of Osmosis

Answer 1

The net movement of water molecules from a solution of high water potentila to a solution of lower water potential through a partially premeable membrane.

Question 2

Examples of osmosis in Nature

Answer 2

• water travelling from the soil to the xylem

Question 3

What is diffusion?

Answer 3

Is the net movement of particles from a region of higher concentration to a region of lower concentration fown a concentration gradient.

Question 4

What are some experiments that are related to osmosis?

Answer 4

• Potato experiment (Measure the length of the potato before and after to see whether the potato increased in length or stayed the same).
• Visking tube

Question 5

Examples of diffusion in nature

(Flip to see not necessar to answer this card)

Answer 5

• Gaseous exchange in the lungs occur via Diffusion

Question 6

What happens ro a cell in a solution of high water potential?
red blood cell

Answer 6

• Water enters the red blood cell via. osmosis because the cytoplasm has a lower water potential than the surrounding solution.
• The cell expands and bursts.

Question 7

What happens to a cell in a solution with high water potential?
(plant cell)

Answer 7

• The cell sap has a lower water potential than the surrounding solution.
• Water enters by Osmosis
• The cell expands and becomes turgid
• The cell wall prevents the cell from bursting

Question 8

What happens to a cell in a solution of low water potential?
(plant cell)

Answer 8

• Cell sap has higher water potentail than the surrounding solution.
• Water leavs the cell by osmosis
• Cytoplasm shrinks away from the cell wall and becomes plasmoloysed

Question 9

What happens to a cell in a solution with low water
potential?
(Red blood cell)

Answer 9

• The cutoplasm has a higher water potentail than the surrounding solution hence, water leaves the cell by osmosis.
• The cell shrinks in size and becomes Crenated (spiky-looking)