Diffusion, Osmosis and Active transport

• Diffusion

  The movement of particles from an area of higher concentration to a lower concentration
• Osmosis

  The diffusion of water molecules from a dilute solution to a concentrated solution through a partially permeable membrane
• Factors affecting the rate of diffusion

  • Temperature
  • Difference in concentration
  • Surface area
• Why is active transport necessary in root hair cells

  For movement of minerals / ions against their concentration gradient
• Name a type of substance that is taken into a root hair cell using active transport

  • Nitrate
  • Minerals
  • Mineral ions