Design/Technology Quiz - Food 02 (Answers)
This KS3 Design and Technology quiz takes a second look at food. Food contains the essential nutrients needed for growth and repair of our bodies. Two important nutrients are proteins and vitamins. Foods that come from animal products are usually high in protein like fish, meat and eggs. They also contain some essential vitamins. Other vitamins are found in fruit and vegetables which is why it is important to eat a balanced diet. Fruit and veg are low in protein so vegetarians and vegans need to find alternative sources of protein.
When preparing food, sometimes things go wrong - lumpy gravy, a jelly that hasn't set. Knowing what ingredients do and something about how they work can help any cook put things right! A good example is jelly - if you don't keep it cool it will turn to a liquid because the gelatine used to solidify it melts again when its temperature rises.
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Alternative sources of protein are meat, nuts and quinoa
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A lack of vitamin C can lead to scurvy
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They absorb any liquid, turning soft and sticky, holding the mixture together
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The fine holes in the sieve only allow the finest particles to go through
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Gelatine is made from animal bones, skins, cartilage and other body parts. Alternatives made from seaweed exist for those whose religion or diet (e.g vegans) prevent its use
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Jelly was popular in Victorian times but they didn't have fridges so it was quite difficult to keep it nice and jellified!
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A sol is a mixture in which tiny particles of solid are spread through a liquid. It is different to an emulsion because a sol is stable and the particles don't ever settle out. Emulsions need an emulsifier to make them stable
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Canning, bottling and irradiation are also ways of preserving
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If added water is more than 5% of contents, it must be listed as an ingredient. It is often listed as aqua to make it sound like a proper ingredient!
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Each type of additive has its own range of E numbers e.g. colourings are E100 to E199
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