Osmosis

• Osmosis


  Diffusion of water through a selectively permeable membrane from dilute to concentrated solution

  
• Diffusion

  movement of substances from an area of higher concentration to an area of lower concentration

  
• Isotonic


  concentration of a solute is equal inside and outside

  
• Concentration Gradient


  movement of a solution or gas from an area of higher number of particles to an area of lower number of particles, the areas are typically separated by a membrane

  
• Selectively Permeable Membrane


  selectively permeable membrane allows small, soluble molecules to pass through it, but prevents large insoluble molecules from passing through.

  
• Cell membrane

  Let's things in and out, like doors

  
• Cell Wall


  thick wall surrounding plant cells, prevents plant cells bursting by limiting water uptake

  
• -lysis


  RBC bursts by this process

  
• shrivelled up

  RBC do this when they lose water

  
• Plasmolysed plant cell


  The cell has lost water and the cytoplasm has shrunk; the membrane has pulled away from the cell wall

  
• Turgid plant cell


  A cell which is swollen with water

  
• Transpiration

  Evaporation of water from the leaves of a plant

  
• Temperature

  increases in this increase transpiration
• Windspeed


  increases in this increase transpiration
• surface area


  increases in this increase transpiration
• humidity

  increases in this decrease transpiration
• Bubble potometer


  Device used to measure rate of transpiration in plants. The plant is connected to a tube of liquid containing a bubble. The bubble rises with higher rate of respiration.

  
• Weight potometer

  Apparatus used to measure the amount of transpiration occurring in a plant by measuring the mass of the plant