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A learner sees a mould patch on bread but needs magnification to see its separate cells. Which explanation fits these observations?
Mould is living; its microscopic cells and structures together form visible growth on the bread. Each visible patch is one giant cell that can be seen without magnification. Mould is only a non-living physical change unrelated to organisms. The bread example proves that every microbe is harmful. Two identical bread pastes are kept under the same conditions. Live yeast is added only to P; heat-killed yeast is added to Q. P produces gas and develops a sour smell, while Q does not. Which conclusion is supported?
Activity of the live yeast is linked to the food changes in P; the matched inactive-yeast control does not show those changes. Greater microbial activity in P preserved it unchanged. The result proves every kind of microbe always causes identical spoilage in every food. Q is guaranteed safe forever because no gas or sour smell was observed during this trial. A vegetable is stored in acidic pickling liquid, while air is removed from a second food before vacuum packaging. Which conditions are changed?
Pickling lowers pH, while vacuum packaging reduces oxygen supply. Pickling increases oxygen, while vacuum packaging lowers pH. Both methods preserve by increasing oxygen supply. Both are identical high-temperature treatments. Freeze-drying and dehydration remove water. A concentrated sugar solution limits the water microbes can use. Which description connects these preservation methods?
They reduce the water available for microbial growth, though sugar need not remove water from the food. They preserve by adding water that increases microbial growth. They all preserve only by keeping the food frozen. They guarantee that no later storage condition can allow spoilage. Which comparison of the temperature-based preservation methods is correct?
Sterilisation, pasteurisation and canning use high temperature as distinct methods; freezing uses low temperature and does not by itself prove permanent sterilisation. Sterilisation, pasteurisation and canning are identical names for one treatment; freezing is otherwise described correctly. Freezing is a high-temperature method that always sterilises food; the other methods are correctly grouped. Every temperature method guarantees that the food can never spoil after treatment. Which row correctly classifies three additives by their stated use?
Vinegar used to delay spoilage—preservative; iron added for nutrition—nutritional supplement; starch used to thicken—texture modifier. All three—preservatives because every additive preserves food. Vinegar—supplement; iron—appearance modifier; starch—preservative. The ingredient names alone fix their role even if the intended use changes.
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A label claims, 'The preservative, added vitamin and colouring all have the same purpose because they are additives.' Which correction is complete?
The label is correct because every additive prevents spoilage. The preservative delays spoilage, the vitamin supplements nutrition, and the colouring modifies appearance. The vitamin modifies texture and the colouring supplies minerals. An ingredient name always fixes its function without any stated use. Which statement about microbes is correct?
Every microbe spoils every food it contacts. They cannot cause a change in food. They are microscopic living organisms, and not all are harmful. They are all visible and non-living. Why would increasing the activity of spoilage microbes be a poor preservation strategy?
Only visible size determines whether spoilage occurs. More activity works against preventing microbial spoilage. More activity always prevents spoilage. Activity never affects food in any way. Vegetables are preserved in an acidic pickling liquid. Which condition has changed?
The food has been sterilised by freezing. The pH has been lowered. The oxygen supply has been increased. The water content has been increased deliberately. A concentrated sugar solution delays microbial spoilage. Which change helps explain this preservation?
Its temperature rises enough to sterilise the food. More oxygen becomes available around the food. Less water is available for microbial growth. Its temperature falls enough to freeze the food. Why should pasteurisation not simply be renamed sterilisation?
Pasteurisation is the low-temperature freezing method. Both work only by increasing oxygen supply. They are distinct methods even though both use high temperature. They are identical names for exactly one treatment. Yeast is added to one sugar solution while a matched solution has no yeast. Only the yeast mixture produces gas and loses sweetness. What does the comparison support?
The yeast is a microbe acting on the food mixture and causing the observed changes. Every microbe always spoils every food in exactly the same way. Sugar alone must be a living microbe because it was present in both mixtures. The gas proves that no chemical change occurred in the mixture. Cooked rice was left warm for six hours. It looks and smells unchanged. Which decision best uses the evidence about food spoilage and safety?
Eat it because harmful microbial activity always produces visible mould first. Freeze it now because later freezing reverses any earlier microbial action. Taste a large portion because taste is a complete safety test. Do not treat appearance and smell alone as proof of safety; unsuitable warm storage can allow microbial activity without visible signs. Two equal cheese portions are refrigerated at the same temperature; one is vacuum packaged and one remains exposed to air. Why can the vacuum-packed portion spoil more slowly?
Removing air adds water that dilutes all spoilage organisms. The package raises the food temperature until microbes evaporate. Removing most air restricts oxygen-dependent microbial activity and oxidation, while refrigeration still remains necessary. The vacuum permanently kills every microbe, so storage temperature no longer matters. A food sample shows almost no microbial growth while frozen, but growth resumes after it is thawed and kept warm. Which explanation fits both observations?
Thawing removed all water, which is why microbial growth increased. Freezing slowed microbial activity without necessarily killing every microbe; thawing restored conditions for growth. Freezing sterilised the sample, and new microbes were created spontaneously during thawing. Frozen microbes used heat faster, so their population became invisible. A manufacturer adds the same substance to two foods: in one it prevents oil and water separating; in the other it makes the colour brighter. How should its role be classified?
By its intended function in each food: an emulsifying or stabilising role in the first and a colouring role in the second. Always as a preservative because every additive must extend shelf life. Always as a nutrient because the substance appears in an ingredient list. It cannot have different roles because a chemical name fixes one use in all foods. Which investigation best tests whether an approved additive acts as a preservative in fruit drink?
Compare one treated refrigerated sample with an untreated sample kept warm and in sunlight. Taste only the treated sample immediately after preparation and infer its future shelf life. Add different colourings to both samples and compare which colour looks stronger. Store matched drink samples under the same conditions, vary only the additive, and compare time to the same spoilage indicator.
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Why can visible mould on bread still be described as involving microbes?
Each visible patch is one giant cell. Mould is non-living because it can be seen. Every microbe is invisible and can never produce a visible result. Microscopic cells and structures together make up the visible growth. A learner can see a mould colony but not its separate cells. What explains this?
The colony proves all microbes are harmful. Microscopic cells and structures together form visible growth. The colony proves each separate cell is visible unaided. The growth is only a non-living physical change. Which example describes microbial action on food?
Milk changes only through unrelated physical movement. Bacteria remain inactive and cause no food change. Every microbe acts identically on every food. Bacteria act on milk and change it. Mould spreads across bread during storage. What does the example show?
A microbe can grow and act on food. Bread mould is a non-living colour pattern only. Microbial action cannot produce visible food changes. One mould example proves every microbe is harmful. How may microbial food spoilage be prevented?
Rely only on whether a change is visible. Kill every microbe or preservation cannot work at all. Stop or reduce microbial activity. Increase microbial activity as much as possible. A method reduces microbial activity without killing every microbe. Can it still help prevent spoilage?
Yes; reducing activity is one stated route to prevention. No; every microbe must be killed first. No; greater activity is what prevents spoilage. Yes, because appearance alone proves permanent safety. Which preservation method prevents spoilage by lowering pH?
Freezing, which is a high-temperature method. Dehydration, which adds water to food. Pickling. Vacuum packaging, which increases oxygen. Most air is removed from food containers before bottling or vacuum packaging, and the containers are sealed. What change can help delay spoilage?
They increase oxygen supply. They lower pH in the same way as pickling. They use high temperature and are identical to sterilisation. They reduce oxygen supply. Which pair consists of methods classified under reducing water content?
Freeze-drying and dehydration. Bottling and vacuum packaging. Sterilisation and pasteurisation. Pickling and freezing only. Which list contains three distinct food-preservation methods that use high temperature?
Freezing, bottling and vacuum packaging. Pickling, dehydration and freeze-drying. Sterilisation only, because all heat methods are identical. Sterilisation, pasteurisation and canning. A canning process uses heat to help prevent spoilage. Which category applies?
Using high temperature. Using low temperature through freezing. Lowering pH through pickling. Increasing oxygen through vacuum packaging. Which food-preservation method uses low temperature?
Vacuum packaging, because it adds oxygen. Pickling, because it raises pH. Freezing. Sterilisation, because freezing is high temperature. What is the intended use of a food preservative?
To supply vitamins and minerals only. To change texture or appearance only. To guarantee that food can never spoil. To delay food spoilage. Which list contains only named examples of preservatives?
Salt, sugar, sulfur dioxide and vinegar. Vitamins, minerals, starch and colouring. Only starch and food colouring. Minerals and vitamins only. Why might a mineral be added to food as a nutritional supplement?
Only to change the food's colour. Because every mineral is a texture modifier. To increase its nutritional content. Only to delay microbial spoilage. Which pair gives named examples of nutritional supplements?
Vinegar and sugar only. Minerals and vitamins. Salt and sulfur dioxide. Food colouring and starch. What is the named purpose of a food colouring?
To thicken food in exactly the same way as starch. To modify food appearance. To supply minerals and vitamins. To act as every food's preservative. Starch is added specifically to thicken a sauce. How is it classified?
As a nutritional supplement because it is a vitamin. As a preservative in every possible use. As an appearance modifier that only changes colour. As a texture modifier.
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