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GCSE Combined Science · key term
Treatment that kills bacteria and other living microorganisms. Potable-water treatment can use chlorine, ozone or ultraviolet light.
Used by AQA and Edexcel
Specification 4.5.3.4, 5.10.1.2 · Paper 2, Paper 4
Surgery intended to permanently prevent reproduction by blocking or cutting reproductive ducts.
Revise: Contraception MethodsSterilisation is surgery intended to permanently prevent reproduction. In male sterilisation, called a vasectomy, the sperm ducts are cut or blocked. Sperm cannot enter the semen and therefore cannot reach an egg.
Paper 5, Paper 6
The killing of microorganisms on or in a material, such as food or medical equipment.
Condoms help protect against sexually transmitted infections; diaphragms, hormonal methods and sterilisation do not.
Sterilisation blocks reproductive ducts. It does not involve removing the testes or ovaries.
Give the purpose of each treatment: filter beds remove insoluble particles; sterilisation kills microbes; desalination removes dissolved salts.
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