TOPIC 2: MOVEMENT ACROSS MEMBRANES

Question 1

Diffusion (definition)

Answer 1

the movement of net particles from an area of higher concentration to an area of lower concentration (passive)

Question 2

Example of Diffusion in human + plants

Answer 2

human: oxygen diffuses into the blood & carbon dioxide diffuses out of the blood in the alveoli
plant: carbon dioxide enters the leaf

Question 3

Osmosis (definition)

Answer 3

the movement of water molecules from an area of higher water potential to an area of lower water potential, through a partially permeable membrane

Question 4

Example of Osmosis in humans + plants

Answer 4

Plants: the movement of water from the soil to the root hair cells
Humans: the uptake of water into the blood, in the nephrons (loop of Henle)

Question 5

Facilitated Diffusion

Answer 5

the movement of particles/substances from an area of higher concentration to an area of lower concentration with the use of a transport protein

Question 6

Active Transport

Answer 6

the movement of particles from an area of lower concentration to an area of higher concentration, using of energy from aerobic respiration

Question 7

Example of active transport in human + plant

Answer 7

Human: absorption of glucose in the nephrons
Plant: the uptake of minerals from the soil into the plant