food contamination and spoilage

• What are the three ways food can be contaminated?

  Physical, chemical, biological
• What is physical contamination?

  Contamination caused by foreign bodies in food
• Name three examples of physical contamination.

  Soil, hair from a cow, hair from packaging
• What is chemical contamination?

  Contamination caused by alien chemicals not naturally present
• Name three examples of chemical contamination.

  Pesticides, cleaning products, fly spray
• Name three food poisoning bacteria.

  Salmonella, Bacillus cereus, E. coli
• What are positive uses of micro-organisms in food production?

  • Bacteria: Yoghurt
  • Yeast: Bread
  • Moulds: Blue cheese
• What are four conditions microorganisms need to survive?

  Moisture, food, time, temperature
• What is the ideal temperature for bacterial growth?

  30°c to 31°c
• What temperature range is known as 'the danger zone'?

  5°c to 63°c
• What is a 'High Risk Food'?

  Food where bacteria multiply rapidly
• Name three examples of high risk foods.

  Meat, milk, uncooked eggs