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WorksheetsKS3 Enzymic Browning
Total questions: 15
Worksheet time: 14mins
Enzymic browning occurs when...
enzymes are damaged and oxidation takes place
Fruit is spoiled and unsafe to eat
Fruit goes mouldy
Food gets bacteria on it and makes your enzymes go brown
Organize these foods into the right categories
Tomatoes
Cucumber
Apple
Pear
Watermelon
Carrots
Swede
Mushrooms
Celery
Peas
This antioxidant is often used in fruit salads in the form of orange juice to prevent enzymic browning.
Vitamin C
Protein
Fat
Calcium
Match the following sentences...
Enzymic browning can be prevented by
acid, heat or water.
The enzyme in fruit that causes fruit to go brown is called
polyphenol oxidase
Polyphenol oxidase is an
enzyme.
Enzymes are
catalysts that speed up reactions.
Pigmentation occurs when fruit browns because
the oxygen reacts with the enzymes.
Enzymic browning is a ...
Biological reaction
Emotional reaction
Chemical Reaction
Allergic reaction
The enzyme in fruit which causes it to go brown is...
Polyphenol Oxidase
Enzymic browning is...
a chemical reaction that causes fruit do go brown when exposed to oxygen
Enzymes are catalysts...
they speed up chemical reactions
Apples, potatoes, avocados, bananas and aubergines are fruits and vegetables...
that are commonly affected by enzymic browning
When the cell of a fruit is cut open,
enzymes react with oxygen in the air and oxidation takes place.
To prevent enzymic browning you can use an acid such as...
Water
Apple juice
Lemon juice
Bicarbonate of soda
Fruits and vegetables that are affected by enzymic browning shouldn't be stored in...
Metal containers
Plastic containers
Glass bowls
Paper plates
Polyphenol oxidase is an (a) this acts as a catalyst and speeds up reactions.
This type of cooking method can prevent enzymic browning...
Boiling
Roasting
Blanching
Grilling
The following methods can be used to preserve fruits and vegetables and stop enzymic browning from happening...
Keep in an airtight container to remove oxygen
Cover with cold water to prevent oxygen mixing with the damaged enzymes
Add an acid which denatures the protein and stops browning taking place
All of the above
The (a) process which occurs in (b) by the enzyme (c) , which results in brown pigmentation is called (d)
When referring to fruits and vegetables, ripening means...
a fruit changing colour when combined with oxygen
a fruit or vegetable maturing so that it is ready to eat
a fruit that has been picked from a tree
a fruit or vegetable that is unsafe to eat
To prepare fruits you should always use a...
Blue chopping board
Brown chopping board
Green chopping board
The chemical reaction when proteins are chemically altered either by acid, agitation or heat is known as...
Coagulation
Caramelisation
Dextrinisation
Denaturation
