Transporting substances

Question 1

Diffusion

Answer 1

The movement of particles from an area of high concentration to low concentration

Question 2

Concentration gradient

Answer 2

the difference between two concentrations forms a concentration gradient. Particles diffuse down a concentration gradient. the bigger the difference, the steeper the concentration gradient and the faster diffusion occurs.

Question 3

Osmosis

Answer 3

The movement of water particles across a partially permeable membrane

Question 4

Active transport

Answer 4

Cells may need to transport molecules against a concentration gradient or transport molecules that are too big to diffuse through the cell membrane. they can do this using active transport.