movement of molecules

Question 1

diffusion

Answer 1

net movement of molecules from area of high to low concentration

Question 2

rates of diffusion

Answer 2

high temp- more kinetic energy, move faster
large difference in concentration gradient- molecules diffuse from high to low quickly
larger surface area- faster
larger volume- takes longer

Question 3

osmosis

Answer 3

net movement of free water particles from high to low concentration over a semi permeable membrane

Question 4

water potential

Answer 4

measure of concentration of free water molecules in solution

Question 5

if a plant loses a lot of water and cant replace it via its roots what happens to the cells of the plant?

Answer 5

slowly becomes plasmolysed- turgor pressure inside cells falls and cannot support the plants weight and so the plant wilts

Question 6

active transport

Answer 6

movement of molecules from low to high concentration using energy

transports substances against concentration gradient- meeds carrier molecule/protein- uses energy to pump the substances across membrane against the concentration gradient