Chapter 3 - Food and Diet

Question 1

How do plants make their food

Answer 1

They photosynthesis

Question 2

How do animal get their food

Answer 2

They eat plants or other animals

Question 3

What is food needed for

Answer 3

As a source of energy

To provide materials for growth

Question 4

Name the 3 groups carbohydrates can be split into

Answer 4

Starch
Sugar
Fibre

Question 5

What is the function of starch and 2 examples of it

Answer 5

To provide energy

Examples = bread and potatoes

Question 6

What is the function of sugar and 2 examples of it

Answer 6

To provide energy

Examples = biscuits and soft drinks

Question 7

What is the function of fibre and 2 examples of it

Answer 7

To prevent constipation

Examples = green vegetables and cereals

Question 8

What is the function of protein and 2 examples of it

Answer 8

For growth and repair of damaged cells

Examples = meat and eggs

Question 9

What is the function of fats and 2 examples of it

Answer 9

To provide energy
To regulate body temp
To insulate the body
To protect delegate organs

Examples = butter and oils

Question 10

What is the function of vitamin C and 2 examples of it

Answer 10

For healthy skin and gums. Prevents Scurvy

Examples = oranges and tomatoes

Question 11

What is the function of vitamin D and 2 examples of it

Answer 11

To build strong bones and teeth. Prevents rickets

Examples = milk and cheese

Question 12

What is the function of iron and 2 examples of it

Answer 12

Makes red blood cells. Prevents anaemia

Examples = red meat and cabbage

Question 13

What is the function of calcium and 2 examples of it

Answer 13

For healthy bones and teeth

Examples = milk and cheese

Question 14

Don’t forget experiment for the presence of starch ( pg 19 )

Answer 14

Substance used for dying foods is iodine. If it turns purple/black it means that starch is present

Question 15

Don’t forget experiment for the presence of a reducing sugar i.e. glucose ( pg 20 )

Answer 15

In one test tube we have : glucose and Benedicts solution
In other test tube we have : water and Benedicts solution

Place both the test tubes in a water bath

If the reducing sugar is present , the Benedicts solution turns from blue to red

Question 16

Don’t forget experiment for the presence of protein ( pg 20 )

Answer 16

In one test tube we have : milk , sodium hydroxide solution and copper sulfate solution
In other test tube we have : water , sodium hydroxide solution and copper sulfate solution

If the protein is present , the solution with milk should turn a blue/purple colour

Question 17

Don’t forget the experiment for the presence of fat ( pg 21 )

Answer 17

Don’t forget the experiment for the presence of fat ( pg 21 )

Question 18

Don’t forget the experiment for investigating the conversion of chemical energy in food into heat energy ( pg 23 )

Answer 18

Don’t forget the experiment for investigating the conversion of chemical energy in food into heat energy ( pg 23 )