movement of substances

Question 1

diffusion

Answer 1

-> net movement of particles from a region of higher concentration to a region of lower concentration, down a concentration gradient

Question 2

osmosis

Answer 2

-> net movement of water molecules from a region of higher water potential to a region of lower water potential, down a water potential gradient

• crenated or shrinks in size
• cell plasmolysed, tissue becomes flaccid
• expands and burst
• turgid

Question 3

active transport

Answer 3

-> process where energy is needed to move particles of a substance against a concentration gradient, from a region of lower concentration to a region of higher concentration. only in living systems.