Movement of Substances Into and Out Of Cells

Question 1

Diffusion

Answer 1

The net movement of molecules from an area of high concentration to an area of low concentration

Question 2

Active transport

Answer 2

The movement of molecules against the concentration gradient using energy from respiration

Question 3

Osmosis

Answer 3

The net movement of water molecules from an area of high water potential to an area of low water potential

Question 4

Diffusion happens more quickly

Answer 4

Greater concentration gradient

Question 5

Larger surface area in proportion to volume

Answer 5

Increase the rate of diffusion

Question 6

The rate of diffusion is decreased

Answer 6

Greater distance over which diffusion has to take place

Question 7

Higher temperatures

Answer 7

The rate of diffusion increases because the particles have more kinetic energy

Question 8

Describe an experiment to measure the effect of a factor upon rate of diffusion

Answer 8

1. Cut a cube of Agar jelly dyed with potassium permanganate from a petri dish
2. Drop the cube into a beaker of dilute hydrochloride acid
3. Note the time taken for the cube to turn colourless
4. Repeat and average
5. Change the independent variable and repeat