CIE IGCSE Biology

Revision Notes

6.6 Mineral Requirements

The Need for Mineral Ions

  • Photosynthesis produces carbohydrates, but plants contain many other types of biological molecule; such as proteins, lipids and nucleic acid (DNA)
  • As plants do not eat, they need to make these substances themselves
    Carbohydrates contain the elements carbon, hydrogen and oxygen but proteins, for example, contain nitrogen as well (and certain amino acids contain other elements too)
  • Other chemicals in plants contain different elements as well, for example chlorophyll contains magnesium and nitrogen
  • This means that without a source of these elements, plants cannot photosynthesise or grow properly
  • Plants obtain these elements in the form of mineral ions actively absorbed from the soil by root hair cells
  • ‘Mineral’ is a term used to describe any naturally occurring inorganic substance
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Effects of Mineral Ion Deficiencies

Mineral deficiencies in plants, IGCSE & GCSE Biology revision notesMineral deficiencies in plants

Mineral Requirements table, IGCSE & GCSE Biology revision notes

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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