Transportstion B1

Question 1

Osmosis

Answer 1

Osmosis is the movement of water molecules, from a higher concentration, to a lower concentration, through a partially permeable membrane.

Question 2

Active transport

Answer 2

substance moves from an area of low concentration to an area of high concentrations, across a partially permeable membrane - requires energy

Question 3

Diffusion

Answer 3

movement of particles from an area of higher concentration to an
area of lower concentration, through a partially permeable membrane

Question 4

Example of osmosis

Answer 4

Water moves by osmosis from a dilute solution in the soil to a concentrated solution in the root hair cell.

Question 5

Example of active transport

Answer 5

Active transport is used to absorb mineral
ions into the root hair cells from more
dilute solutions in the soil.

Question 6

Example of diffusion

Answer 6

Oxygen diffuses from the air in the alveoli into the blood in the capillaries. Carbon dioxide diffuses from
the blood in the capillaries into the air in the alveoli.

Question 7

Is energy required for active transport, osmosis or diffusion?

Answer 7

Only active transport- energy released by respiration

Question 8

Name 3 factors affecting diffusion

Answer 8

concentration, temperature, and surface area of the
membrane.