CIE IGCSE Biology: 复习笔记:3.1.3 Water

CIE IGCSE Biology: 复习笔记:3.1.3 Water

Water as a Solvent

  • Water is important for all living organisms as many substances are able to dissolve in it (it is a solvent)
  • This makes it incredibly useful and essential for all life on Earth
  • Water is important as a solvent in the following situations within organisms:
    • Dissolved substances can be easily transported around organisms - eg xylem and phloem of plants and dissolved food molecules in the blood
    • Digested food molecules are in the alimentary canal but need to be moved to cells all over the body - without water as a solvent this would not be able to happen
    • Toxic substances such as urea and substances in excess of requirements such as salts can dissolve in water which makes them easy to remove from the body in urine
    • Water is also an important part of the cytoplasm and plays a role in ensuring metabolic reactions can happen as necessary in cells

Water as a Solvent, IGCSE & GCSE Biology revision notes

Water as a solvent