Diffusion and Osmosis

Question 1

Define diffusion.

Answer 1

The net movement of particles from an area of higher concentration to an area of lower concentration

Question 2

Name the 4 factors affecting diffusion.

Answer 2

Surface area
Temperature
Concentration gradient
Distance

Question 3

Give 2 examples of diffusion in biology.

Answer 3

-Oxygen and carbon dioxide moving in and out of cells.
-Food molecules moving from the bloodstream into cells.

Question 4

Define osmosis.

Answer 4

The net movement of water molecules from a region of higher water potential (dilute solution) to a region of lower water potential (concentrated solution) through a partially permeable membrane.

Question 5

What does isotonic mean?

Answer 5

When there is the same concentration of solutes and solvents inside and outside the cell, so osmosis will not occur.

Question 6

What does hypertonic mean?

Answer 6

When there is a higher concentration of solutes than solvents (concentrated solution) outside the cell, so water will leave the cell.

Question 7

What does hypotonic mean?

Answer 7

When there is a lower concentration of solutes than solvents (dilute solution) outside the cell, so water will enter the cell.