Food & Diet

Question 1

What does 4.2J do?

Answer 1

Heats 1cm cubed of water by 1 degrees Celsius

Question 2

What are the three main factors that affect our energy requirements?

Answer 2

Activity
Age
Gender

Question 3

What is the function of starchy carbohydrates? Example?

Answer 3

Slow release energy

Pasta

Question 4

What is the function of sugary carbohydrates? Example?

Answer 4

Fast release energy

Cakes

Question 5

What are the function of fats? Examples?

Answer 5

Energy & insulation

Sausages

Question 6

What are the functions of proteins? Examples?

Answer 6

Growth, repair & body cells

Fish

Question 7

What are the functions of water?

Answer 7

Solvent - for chemical reactions to take place in

Transport medium, e.g. blood

Question 8

What is the function of fibre? Examples?

Answer 8

Prevents constipation

Green veg.

Question 9

What are the functions of vitamin C? Examples?

Answer 9

Healthy teeth & gums

Oranges

Question 10

What are the functions of vitamin D? Examples?

Answer 10

Strong bones & teeth

Fish

Question 11

What is the function of calcium? Examples?

Answer 11

Strong bones & teeth

Milk

Question 12

What is the function of iron? Examples?

Answer 12

Helps RBCs carry oxygen around the body

Red meat

Question 13

What does benedict’s need to test its substrate? What is the colour change?

Answer 13

Needs heat in a water bath
Tests glucose
Blue — brick red precipitate

Question 14

What does iodine test for? What is the colour change?

Answer 14

Starch

Yellow-brown — blue-black

Question 15

What does biuret (NaOH + CuSO4) test for? What is the colour change?

Answer 15

Protein

Blue — purple (or lilac)

Question 16

What does ethanol test for? What is the colour change?

Answer 16

Fat

Clear — white emulsion

Question 17

What is obesity caused by? How de we reduce the risk?

Answer 17

Taking in too much energy, e.g. too much sugar, starch or fat
Eat a healthy, balanced diet, increase exercise

Question 18

What causes heart disease? How do we reduce the risk?

Answer 18

Cholesterol & other fatty substances being present in high level. They build up on wall of artery, narrowing them & making it difficult for blood to flow through them, resulting in a a heart attack.
Reduce stress, increase exercise, healthy balanced diet

Question 19

What causes a stroke? How do we reduce the risk?

Answer 19

Poor diet wich can damage circulatory system. Fat builds up & causes blockage in blood vessel in brain
Increase exercise, reduce stress, low salt

Question 20

What happens when we exercise?

Answer 20

Our pulse rate increases to pump more blood, containing more oxygen to muscle cells for respiration.

Question 21

What is respiration?

Answer 21

An exothermic reaction which takes place inside cells

Question 22

What is the word & balanced equation for respiration?

Answer 22

Glucose + oxygen —> water + carbon dioxide + energy

C6H12 + 6O2 —> 6CO2 + 6H2O + ENERGY

Question 23

Why are many people in society slow to adapt their lifestyle to reduce the risk?

Answer 23

Difficult to give up sugary foods
Not going to happen to them
Readymeals are convenient
No point in changing now

Question 24

What are the costs to society as of circulatory disorders?

Answer 24

Expensive equipment needed in hospitals 
Highly trained staff needed 
Drugs for treatment are expensive 
Less family income 
Patient in hospital for weeks