(a) Describe how drying or dehydration preserves food. [3] (b) Name two foods that can be preserved by drying. [2] (c) Explain what is meant by the term 'pa...
Question 1 Report
(a) Describe how drying or dehydration preserves food. [3]
(b) Name two foods that can be preserved by drying. [2]
(c) Explain what is meant by the term 'pasteurisation' and state why it is used for milk. [3]
Answer Details
(a) Describe how drying preserves food. [3]
One mark for each valid point (max 3):
- Drying removes most of the water from the food (1)
- Bacteria need moisture to grow and multiply, so removing the water stops them from growing (1)
- Dried food is lighter and smaller, making it easy to store and transport (1)
(b) Name two foods preserved by drying. [2]
One mark each (max 2):
- Pasta (1)
- Rice (1)
- Dried fruit such as raisins or apricots (1)
- Herbs and spices (1)
- Powdered milk (1)
- Instant coffee (1)
(c) Explain pasteurisation and why it is used for milk. [3]
One mark for each valid point (max 3):
- Pasteurisation is the process of heating a liquid to a specific temperature for a set time (1)
- Milk is heated to 72 degrees Celsius for 15 seconds, then rapidly cooled (1)
- This kills most harmful bacteria in the milk without significantly changing its taste or nutritive value (1)
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