Food Spoilage and Preservation
Each subtopic includes About section, revision page link, 10 preview questions, and practice CTAs.
Factors Causing Food Spoilage
SubtopicFactors Causing Food Spoilage under Food Spoilage and Preservation for Grade 5 CBSE.
Preview questions (no answers)
- 1.
What happens to the appearance of a tomato when it becomes spoiled?
A.It gets very hard and shiny
B.It becomes watery, soft, and may develop mold
C.It turns into a green leaf
D.It stays fresh forever
- 2.
Why is it recommended to avoid eating food that has been kept uncovered for several hours?
A.It will lose its weight
B.Dust, flies, and germs can easily settle on it
C.It will become too hot to eat
D.The color will become too bright
- 3.
Which of these describes the appearance and smell of spoiled cooked rice?
A.Dry and odorless
B.Sticky, slimy, and sour-smelling
C.Hard and salty
D.White and fluffy
- 4.
What are the natural chemicals inside fruits and vegetables that cause them to ripen and eventually spoil?
A.Vitamins
B.Enzymes
C.Minerals
D.Water
- 5.
Food items like pickles and jams last longer than fresh fruits and vegetables because they contain:
A.Large amounts of water
B.Preservatives like salt, sugar, or vinegar that inhibit microbial growth
C.More air inside the jars
D.Bacteria that help keep the food fresh
- 6.
Which of the following statements about yeast is correct in the context of food spoilage?
A.Yeast is a type of mineral that makes food salty
B.Yeast can cause fruit juices to ferment and taste alcoholic or sour
C.Yeast only grows in frozen food
D.Yeast is an insect that eats grains
- 7.
Why does boiling milk help in preventing it from spoiling for a few more hours?
A.It adds more water to the milk
B.The high temperature kills many spoilage-causing bacteria
C.It turns the milk into a solid
D.It makes the milk change its color
- 8.
Which of these best explains why 'Salted Fish' resists spoilage longer than 'Fresh Fish'?
A.Salt makes the fish too heavy for bacteria to lift.
B.Salt draws out moisture through osmosis, leaving too little water for microbial growth.
C.Salt turns the fish into a different species.
D.Bacteria prefer sugar over salt.
- 9.
What is the effect of 'Low Temperature' on the enzymes naturally present in fruits?
A.It makes them work faster.
B.It slows down their activity, delaying over-ripening.
C.It changes them into sugar.
D.It makes them disappear.
- 10.
If you find a 'Moldy' patch on a block of hard cheese, why is it often unsafe to just cut off the moldy part and eat the rest?
A.The mold has no roots, so it is fine.
B.Mold can produce invisible 'Mycotoxins' that penetrate deep into the food.
C.Cutting it makes the mold grow faster.
D.The cheese will lose all its salt.
Download the worksheet for Food Spoilage and Preservation - Factors Causing Food Spoilage to practice offline. It includes additional chapter-level practice questions.
Traditional and Modern Preservation Methods
SubtopicTraditional and Modern Preservation Methods under Food Spoilage and Preservation for Grade 5 CBSE.
Preview questions (no answers)
- 1.
Why do we cover our food with lids or nets?
A.To hide it from people
B.To prevent dust and flies from spoiling it
C.To make it stay hot forever
D.To change its flavor
- 2.
Which of these is a common traditional way to preserve coriander or mint leaves?
A.Boiling them
B.Drying them in a shady place
C.Freezing them in ice
D.Putting them in sugar syrup
- 3.
What is the primary role of a 'Deep Freezer' in a grocery store?
A.To cook food
B.To store frozen items like meat and peas for a long time
C.To dry vegetables
D.To heat up snacks
- 4.
Which of these is a modern way of preserving liquid foods like fruit juices?
A.Drying them in the sun
B.Tetra-packing in sterilized boxes
C.Adding mud
D.Keeping them in open buckets
- 5.
What is the primary difference between refrigeration and freezing?
A.Refrigeration uses salt, while freezing uses sugar
B.Refrigeration is for cooked food, freezing is only for raw food
C.Freezing is at much lower temperatures ( or below) than refrigeration
D.Refrigeration kills germs, while freezing only makes them sleep
- 6.
Which of these food preservation methods is most likely to change the taste and texture of the food significantly?
A.Refrigeration
B.Pickling
C.Vacuum sealing
D.Cold storage
- 7.
If you notice a 'black powder' on an onion, it is most likely a type of:
A.Dirt from the soil
B.Fungus (Mold)
C.Crushed coal
D.Small insects
- 8.
Why is it unsafe to refreeze food that has already thawed?
A.The food will turn into a liquid permanently
B.The bacteria that multiplied during thawing will not be killed by refreezing and can reach dangerous levels
C.The food will lose all its weight
D.Refreezing makes the food taste like salt
- 9.
What is the primary reason why 'Concentrated' milk (like condensed milk) lasts longer than regular milk?
A.It has more water for the bacteria to swim in
B.The high sugar content and reduced water activity prevent spoilage
C.It is stored in smaller cans
D.The cows used for this milk are different
- 10.
In the context of preservation, what is the role of 'Jelling agents' like pectin in jams?
A.To make the jam very runny
B.To bind water so it is less available for microbial growth
C.To change the color of the fruit
D.To add more air to the jar
Download the worksheet for Food Spoilage and Preservation - Traditional and Modern Preservation Methods to practice offline. It includes additional chapter-level practice questions.
Understanding Food Labels and Expiry
SubtopicUnderstanding Food Labels and Expiry under Food Spoilage and Preservation for Grade 5 CBSE.
Preview questions (no answers)
- 1.
If you leave a slice of apple in the open, it turns brown. This is an example of:
A.Preservation
B.Cooking
C.Spoilage or reaction with air
D.Cleaning
- 2.
Which of these should we check first before eating a chocolate bar from a shop?
A.The color of the wrapper
B.The expiry date
C.The shopkeeper's name
D.The shape of the bar
- 3.
Which of these is a sign that a potato has started to spoil?
A.It is firm and brown
B.It is soft, mushy, and has a bad smell
C.It has a smooth skin
D.It is hard to cut
- 4.
Why are some food items like chips filled with nitrogen gas inside the packet?
A.To make the packet heavy
B.To prevent the chips from getting crushed and reacting with oxygen
C.To make the chips spicy
D.To change the color of the chips
- 5.
Which information on a food label is most important for a person who is trying to reduce their sugar intake?
A.Date of Manufacture
B.Net Quantity
C.Nutritional Information (Sugar content)
D.Manufacturer's Website
- 6.
Which of these is a benefit of preserving food?
A.It allows us to enjoy seasonal fruits all year round.
B.It makes the food heavier.
C.It increases the cost of the food.
D.It removes all the calories from the food.
- 7.
What should you do if you realize you have accidentally eaten a small portion of spoiled food?
A.Eat more to balance it out.
B.Wait and watch for symptoms like nausea, and inform an adult or doctor.
C.Go to sleep immediately.
D.Exercise vigorously.
- 8.
What is the primary reason for 'Vacuum Sealing' coffee powder in jars or bags?
A.To prevent the coffee from leaking out
B.To preserve the aroma and prevent the oils in coffee from reacting with oxygen
C.To make the coffee powder look like a solid brick
D.To keep the coffee at a high temperature
- 9.
Why are preservatives like Sulfur Dioxide used in many dried fruits?
A.To make the fruit taste like sulfur
B.To maintain the bright color of the fruit and prevent it from turning dark brown
C.To add extra seeds to the fruit
D.To make the fruit grow larger inside the bag
- 10.
What does the presence of 'Lactic Acid' in yogurt do to help preserve it?
A.It makes the yogurt turn into milk again
B.It lowers the pH level, making it difficult for spoilage-causing bacteria to grow
C.It adds a sweet chocolate flavor
D.It helps the yogurt stay frozen at room temperature
Download the worksheet for Food Spoilage and Preservation - Understanding Food Labels and Expiry to practice offline. It includes additional chapter-level practice questions.