Biology: Year 9 Term 2: Diffusion 0.0 / 5 ? BiologyExchange of materialsGCSEAQA Created by: Charlotte HerondaleCreated on: 18-01-18 17:06 Define diffusion. (3) The net movement of particles from an area of high to low concentration 1 of 8 Why does diffusion occur? (2) Particles in a gas or liquid are always moving randomly 2 of 8 Diffusion is a [what?] process. (1) Passive 3 of 8 Which 4 things increase the rate of diffusion? (4) Heat, Concentration, Distance, Surface area 4 of 8 Diffusion occurs in cells to swap which gases from which process? (4) CO2, H2O, O2 - aerobic respiration 5 of 8 What is an exchange surface? (3) An area where waste products and incoming reactants are swapped, e.g. the alveoli 6 of 8 Multicellular organisms need these surfaces instead of using skin because of our... (2) Smaller SA:V ratio than unicellular organisms 7 of 8 Name 3 exchange surfaces in other organisms. (3) Gills, Leaves, Roots 8 of 8
Comments
No comments have yet been made