Chapter 3-Food

Question 1

Balanced diet needs:

Answer 1

• carbohydrates
• fats
• proteins
• vitamins
• minerals
• water

Question 2

What chemical tests for starch?

Answer 2

Iodine

Question 3

What chemical tests for reducing sugars?

Answer 3

Benedict’s solution

Blue-> Brick Red

Question 4

What tests for fat?

Answer 4

Brown paper

Question 5

Difference between animals and plants in relation to food

Answer 5

Plants-produce own food

Animals-consume food

Question 6

What type of people need more food?

Answer 6

• young people
• men
• active people
• malnourished people

Question 7

What people need less food

Answer 7

• old people
• women
• inactive people
• healthy people

Question 8

Name the three types of Carbohydrates and their functions (give examples)

Answer 8

• Sugar- Fast Energy eg. Fruit, honey, soft drinks
• Starch-Slow Release Energy eg. Bread, pasta, rice,
• Fibre-Prevents constipation eg. Fruit, veg, cereals, brown bread

Question 9

What functions does fat have in our body? Give examples.

Answer 9

-supply energy
-insulate body
Eg. Butter, cream, milk, oil

Question 10

What function does protein have in our body?

Answer 10

Builds body
-makes muscle
-makes hair
-makes hormones
-makes enzymes
Eg. Meat, peas, cheese, beans

Question 11

Give two vitamins and their functions

Answer 11

• Vitamin C-keeps skin and bones healthy eg. Fruit, green vegetables
• Vitamin D- forms strong bones eg. Milk, cheese, yoghurt

Question 12

Give two minerals, their scientific names and their functions

Answer 12

• Iron (Fe)- Froms part of red blood cells eg. Green veg, red meat, egg yolk
• Calcium (Ca)- Forms strong bones eh. Milk, cheese, yoghurt

Question 13

Give the function of water to the body

Answer 13

•To allow cells to function eg. Drinks, vegetables

Question 14

Test for protein and colour change

Answer 14

Biuret Regeant

Sodium Hydroxide+Copper Sulfate
Blue ➡️Purple

Question 15

Describe how to prove the conversion of chemical energy to heat energy

Answer 15

Burn a cream cracker under a test tube of water

Water will heat up