2.16: Describe Experiments to Investigate Diffusion and Osmosis Using Living and Non - Living Systems

EXPERIMENT:

INVESTIGATING DIFFUSION

LIVING In Alveoli

EXPLANATION: During Inhalation, Oxygen Enters Alveoli High Concentration of Oxygen in Alveoli, Low Concentration of Oxygen in Blood Capillaries Oxygen will Diffuse out of Alveoli Down the Concentration Gradient Into Blood Capillaries Oppositely, There is High Concentration of Carbon Dioxide in Blood Capillaries (from Waste of Respiration) and Low Concentration of Carbon Dioxide in Alveoli Carbon Dioxide will Diffuse out of Blood Capillaries Down the Concentration Gradient into Alveoli This is how Net Exchange of Gases Take Place

NON - LIVING Potassium Permanganate in Solvent (Water)

EXPLANATION: Dye (Potassium Permanganate) is added into Water (Solvent) Overtime, Colour of the Solvent will be weaker than Colour of Dye Dye Particles will Diffuse with Solvent Particles (Move from Areas with High Concentration to Low Concentration), Diffusing throughout the Solvent Dye Particles will be less Concentrated so in the end, Colour will be Weaker

INVESTIGATING OSMOSIS

LIVING In Root Hair Cell

EXPLANATION: High Concentration of Water Particles Outside in the Soil, Low Concentration of Water Particles in the Root Hair Cell (Strong Concentration Gradient) Water Particles will move through the Partially Permeable Membrane of the Root Hair Cell Down the Concentration Gradient into the Cell and up the Xylem for use Root Hair Cell is adapted by having a Large Surface Area to Volume Ratio

NON - LIVING Visking Tube with Sucrose Solution in Water

EXPLANATION Visking Tube filled with Sucrose Solution is placed into a beaker of Water Concentration of Water Particles are Higher Outside than Inside of the Visking Tube Water Particles will move through the Partially Permeable Membrane of the Visking Tube, Down the Concentration Gradient until Water Equilibrium is met Overtime, Size of Visking Tube will Increase as more Water Particles will Move in by Osmosis to dilute the Sucrose Solution so Water Concentration inside and outside are the same