Biology food tests and nutrients

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What is nutrients?
Nutrients:-Essential substance that your body needs to survive, provided by food.
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Why are nutrients important?
Nutrients are important as you need to eat a variety of different food groups in the correct proportion to have a balanced diet.
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What do we mean by balanced diet?
This means eating food containing the right nutrients in the correct amounts.
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What does an unbalanced diet cause?
An unbalanced diet causes a person to become malnourished so they might become overweight, underweight or ill.
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What are the five nutrients including the two extra which make it 7 and state what they are needed for?
.carbohydrates:-main source of energy
.lipids:-Energy and insulation
.proteins:-growth and repair
.vitamins:-To keep us healthy
.minerals:-To keep us healthy
.fibre:-To help food go through the gut
.water:-To eep us hydrated
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How do you test for starch?
To test for starch use iodine solution.Iodine solution is an orange-yellow liquid.
1)Add a few drops of iodine solution to the food solution.
2)If the solution turns a dark blue-black colour then the food contains starch.
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How do you test for lipids?
To test fro lipids in a solid piece of food you use a piece of filter paper.
1)Rub some of the food onto a piece of filter paper
2)Hold the paper up to the light. If the paper has gone translucent the food contains lipids.
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How do you test for lipids in a food solution?
To test for lipids in a food solution you use ethanol
Ethanol is a colourless liquid.
1)Add a few drops of ethanol to the food solution.
2)Shake the test tube and leave for one minute.
3)Pour the ethanol into a test tube of water.
4)If the solution turns
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How do you test for sugar?
To test for simple sugar's such as glucose you use Benedict's solution.Benedict's solution is a blue liquid.
1)Add a few drops of Benedict's solution to the food solution.
2)Heat the test tube in a water bath
3)if the solution turns orange-red the food co
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How do you test for protein?
To test for protein you use copper sulphate solution and sodium hydroxide solution.Copper sulphate is a pale blue liquid.Sodium hydroxide is a colourless liquid.
1)Add a few drops of copper sulphate solution to your food solution.
2)Add a few drops of so
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Other cards in this set

Card 2

Front

Why are nutrients important?

Back

Nutrients are important as you need to eat a variety of different food groups in the correct proportion to have a balanced diet.

Card 3

Front

What do we mean by balanced diet?

Back

Preview of the front of card 3

Card 4

Front

What does an unbalanced diet cause?

Back

Preview of the front of card 4

Card 5

Front

What are the five nutrients including the two extra which make it 7 and state what they are needed for?

Back

Preview of the front of card 5
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