B1 - Osmosis, Active Transport and Diffusion

Question 1

Osmosis

Answer 1

The movement of water molecules from a dilute to a concentrated solution through a partially permable membrane

Question 2

Dilute solution

Answer 2

A solution that contains a small amount of solute

Question 3

Concentraed solution

Answer 3

A solution that contrains a large amount of solute

Question 4

Active transport

Answer 4

The movement of substances from a more dilute solution to a more concentrated solution against a concentration gradent. Requires energy from respiration

Question 5

Concentration

Answer 5

A measure of the amount of solute in a solution

Question 6

Concentration gradient

Answer 6

The difference in concentration between two solutions of either side of a membrane

Question 7

Diffusion

Answer 7

The spreading out of particles resulting in a net movement from an area of higher concentration to an area of lower concentration

Question 8

Partially permable membrane

Answer 8

A membrane that allows small molecules to pass across it (e.g. water) but does not allow the passage of lare molecules (e.g. solutes)