Chapter 4 - Food And Diet

Question 1

What is photosynthesis?

Answer 1

The way plants make their food

Question 2

What is food needed for?

Answer 2

• As a source of energy

- To provide material for growth

Question 3

Name three carbohydrates?

Answer 3

• Sugar
• Starch
• Cellulose

Question 4

What is the function of starch and what foods contain starch?

Answer 4

Function : to provide energy

Foods : potatoes, pasta, bread

Question 5

What is the function of sugar and what foods contain sugar?

Answer 5

Function : to provide energy

Foods: fruit, honey, milk

Question 6

What is the function of Cellulose and what foods contain Cellulose?

Answer 6

Function : to prevent constipation

Foods : green vegetables, cereal

Question 7

What is the function of Protein and what foods contain Protein?

Answer 7

Function : for growth, to repair cells, to make muscle and hair
Foods : lean meat, egg white, soya, nuts, fish

Question 8

What is the function of fats and what foods contain fats?

Answer 8

Function : to provide insulation and as an energy store

Foods : butter, milk, cheese, oil

Question 9

Name two types of vitamins?

Answer 9

• Vitamin D

- Vitamin C

Question 10

What is the function of vitamin C and what foods contain vitamin C?

Answer 10

Function : healthy skin and gums, prevent scurvy

Foods : Citrus fruits e.g. Lemons

Question 11

What is the function of vitamin D and what foods contain vitamin D?

Answer 11

Function : strong teeth and bones, prevent rickets

Foods : Cheese, Milk, Yogurt

Question 12

Name two types of minerals?

Answer 12

• Iron

- Calcium

Question 13

What is the function of iron and what foods contain iron?

Answer 13

Function : to make red blood cells, to prevent anamia

Foods : red meat, liver, cabbage

Question 14

What is the function of calcium and what foods contain calcium?

Answer 14

Function : healthy bones and teeth

Foods : milk, tinned salmon

Question 15

Experiment: To test for the presence of Starch

Answer 15

1) Fill a test tube with starch solution
2) add a few drops off iodine
3) iodine = blue black when starch is present
Iodine = yellow when starch is not present

Question 16

Experiment: to test for the presence of a reducing sugar (glucose)

Answer 16

1) fill two test tubes with benedicts solution and set up a water bath
2) add glucose to one and iodine to the other
3) tube with glucose goes red brick, water stays blue

Question 17

Experiment :To test for the presence of protein

Answer 17

1) fill two test tubes with sodium hydroxide solution
2) add milk to one and water to the other
3) add copper sulphate solution
4) mixture with milk goes purple
Mixture with water remains blue

Question 18

What does diet depend on?

Answer 18

• Your gender
• Your age
• Your physical activity

Question 19

Experiment : to investigate the conservation of chemical energy in food into heat energy

Answer 19

1) clamp a test tube of water and a thermometer in a retort stand
2) burn a cracker beneath the water and heat the water with using a mounted needle
3) temperature rises