Tests For Food Groups

Question 1

Test for protein

Answer 1

Put (3cm cubed) food solution into a test tube using a syringe.
Add (3cm cubed) Biuret solution using a clean plastic pipette.
Gently shake the test tube
Observe results

Question 2

Test for fats (lipids and oils)

Answer 2

Put (2cm cubed) oil in to a test tube using a syringe
Add (2cm cubed) ethanol using a plastic pipette
Shake the test tube
Pour into a test tube containing water

Question 3

List of food groups (most needed to least)

Answer 3

Vegetables, carbohydrates, protein, dairy, oils and spreads

Question 4

Testing for sugar

Answer 4

Put (5cm cubed) of food solution into a test tube
Add (5cm cubed) of Benedict’s solution to the food sample which should show a blue colour.
Put the test tube into a beaker of hot water for a few minutes
Observe results

Question 5

Testing for starch

Answer 5

Put a few drops of the food solution into the spotting tile
Add two or three drops of iodine solution to the food sample
Observe results

Question 6

Results for protein test

Answer 6

A positive result for protein shows the pale blue colour turns to violet.
A negative result for protein stays pale blue

Question 7

Results for sugar test

Answer 7

A positive result is when the blue colour turns orange or red - glucose is present
A negative result is when there is no colour change

Question 8

Results for starch test

Answer 8

A positive result is when a blue black colour is seen - starch is present
A negative result is when there is no colour change, (stays brown) - no starch is present

Question 9

Results for fats test

Answer 9

A positive result for lipids is the solution becomes cloudy as
an emulsion is formed.
A negative result for lipids is there is no colour change.

Question 10

Consequences of bad diet

Answer 10

No energy, bones and tissue are not mending properly