UNIT 1 - Nutrition and Health (3)

Question 1

Name the test and reagent for starch. (1 mark)

Answer 1

Starch test

Iodine

Question 2

Name the test and reagent for sugar. (1 mark)

Answer 2

Benedict’s test

Benedict’s solution

Question 3

Name the test and reagent for protein. (1 mark)

Answer 3

Biuret test

Sodium Hydroxide and Copper Sulphate

Question 4

Name the test and reagent for fat. (1 mark)

Answer 4

Ethanol Test

Ethanol

Question 5

Describe the method and results for a Starch Test (2 marks)

Answer 5

1. Add iodine to the food

Positive result - Yellow-brown to blue black

Question 6

Describe the method and results for a Benedict’s Test. (2 marks)

Answer 6

1. Add Benedict’s solution to the food and heat in a hot water bath.
   Turns from blue to green to orange to brick red precipitate.

Question 7

Describe the method and results for a Biuret test. (2 marks)

Answer 7

1. Add sodium hydroxide to the food solution, the add copper sulphate and shake.
   Turns from blue to purple

Question 8

Describe the method and results for a Ethanol Test. (2 marks)

Answer 8

1. Mix the food with Ethanol.

Turns from clear to white emulsion.

Question 9

Explain why sugar is needed in the body. (1 mark)

Answer 9

For a quick energy release.

Question 10

Name all the elements found in carbohydrate. (3 marks)

Answer 10

Oxygen, Carbon, Hydrogen.

Question 11

Name the carbohydrate found: (2 marks)

In fibre,
Used in respiration,

Answer 11

Cellulose

Glucose

Question 12

Which food provides most energy, (1 mark)

Potatoes, Butter, Cabbage

Answer 12

Butter

Question 13

Why should your diet contain, (2 marks)
Protein,
Fibre,

Answer 13

Protein- Repair your cells

Fibre - Reduces constipation

Question 14

Name one example of a vitamin and give its function in the body. (2 marks)

Answer 14

Vitamin D, helps absorb Calcium.

Question 15

Name one mineral that is needed for healthy bones. (1 mark)

Answer 15

Calcium

Question 16

Give three uses of water in the body. (3 marks)

Answer 16

1. To hydrate cells
2. To help regulate your body temperature
3. Remove waste products

Question 17

Why does the body need energy? (1 mark)

Answer 17

To move, to respire, to reproduce.

Question 18

When testing the energy content of food, suggest one reason why the results might be unreliable. (1 mark)

Answer 18

The heat might conduct down the pin or the pasta might not completely burn out.

Question 19

Vitamin C indicator. (1 mark)

Answer 19

DCPIP

Question 20

Equation to calculate BMI.

Answer 20

Weight divided by height [squared]

Kg divided by m2

Question 21

The small intestines job is to … (1 mark)

Answer 21

Ensure the efficient absorption of digested food particles.

Question 22

The small intestine is specialised as … (3 marks)

Answer 22

1. It has a thin wall, allows food particles to have a short distance to travel from small intestine to blood.
2. Permeable membrane stops large insoluble molecules and substances from passing through.
3. The rich blood supply allows the maintenance of the concentration gradient between the small intestine and the blood
4. The large surface area due to the long length of the intestine and the villi that line that wall increase diffusion.