Revision Notes

4.4 Water

Importance 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
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Role within Organisms

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 notesWater as a solvent

Author: Jenna

Jenna studied at Cardiff University before training to become a science teacher at the University of Bath specialising in Biology (although she loves teaching all three sciences at GCSE level!). Teaching is her passion, and with 10 years experience teaching across a wide range of specifications – from GCSE and A Level Biology in the UK to IGCSE and IB Biology internationally – she knows what is required to pass those Biology exams.

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