Food tests

Question 1

Describe the Benedict’s to test for glucose?

Answer 1

prepare a food sample and transfer 5cm squared to a test tube

prepare a water bath so that it set up to 75 degrees C

Add some Benedict’s solution to the test tube (about 10 drops) using a pipette

place the test tube in the water bath using a test tube holder and leave it there for 5 minutes, make sure the test tube is pointing away from you

If the food sample contains glucose, the solution will change from blue to green or yellow (in low concentrations) or brick red (in high concentrations)

Question 2

describe the iodine test for starch?

Answer 2

Question 3

describe the Biuret test for protein?

Answer 3

Question 4

describe the Sudan III test for Lipids?

Answer 4

Question 5

What is the function of carbohydrates and name an example?

Answer 5

they provide energy

example: pasta, rice, sugar

Question 6

what is the function of lipids (fats and oils) and name an example?

Answer 6

provide energy, act as an energy store and provide insulation.

example: butter, oily fish

Question 7

what is the function of proteins? and name an example?

Answer 7

needed for the growth and repair of tissue, and to provide energy in emergency

Question 8

what is the function of vitamin A? and name an example?

Answer 8

helps improve vison and keep skin and hair healthy

example : liver

Question 9

what is the function of Vitamin C? and name an example?

Answer 9

needed to prevent scurvy

example: fruit

Question 10

What is the function of Vitamin D? and name an example?

Answer 10

needed for calcium absorption

example: eggs

Question 11

what is the function of mineral ions? - calcium and name an example?

Answer 11

needed to make bones and teeth

example: milk, cheese.

Question 12

what is the function of mineral ions? - Iron? and name an example?

Answer 12

needed to make Haemoblobin for healthy blood

example: red meat

Question 13

what is the function of water? and name an example?

Answer 13

just about every bodily function relies on water - we need a constant supply to replace water lost through urinating, breathing and sweating

Question 14

what is the function of dietary fibre? and name an example?

Answer 14

aids the movement of food through the gut

example: wholemeal bread, fruit

Question 15

list the 6 essential nutrients?

Answer 15

Carbohydrates, proteins, lipids, vitamins, minerals and water

Question 16

name the 3 factors that effect how much energy is needed per person?

Answer 16

Activity level
age
pregnancy

Question 17

Describe a practical energy for food?

Answer 17

Question 18

energy in food - how do you calculate the energy in joules

Answer 18

Question 19

energy in food - how do you calculate the energy in joules? and how can one increase accuracy?

Answer 19