Question 1

Which is a factor that causes communicable disease?

Accepted Answer

viruses

Answer

diet

Answer

stress

Answer

smoking

Question 2

Which disease is an example of a communicable disease caused by a virus?

Accepted Answer

measles

Answer

gonorrhoea

Answer

malaria

Answer

Salmonella

Question 3

Which of these is a chemical produced by white blood cells to
destroy a specific bacteria or virus?

Accepted Answer

antibody

Answer

antibiotic

Answer

antitoxin

Answer

antigen

Question 4

Which disease is sexually transmitted?

Accepted Answer

gonorrhoea

Answer

measles

Answer

crown galls

Answer

malaria

Question 5

Which is a way that white blood cells destroy pathogens and protect you against disease?

Accepted Answer

produce antibodies

Answer

secrete mucus

Answer

produce antimicrobial secretions

Answer

produce acid

Question 6

How do cilia lining the airways in the respiratory system help to defend the body against disease?

Accepted Answer

They waft microorganisms away from the lungs

Answer

They produce antimicrobial secretions

Answer

They trap microorganisms

Answer

They act as a barrier to stop microorganisms from entering the cells

Question 7

The number of cases of people in the UK infected with measles has fallen over the last 40 years. Which statement best explains why?

Accepted Answer

The number of children being vaccinated against measles has increased

Answer

The disease is diagnosed more quickly

Answer

The population has decreased

Answer

Better antibiotics have been developed

Question 8

The life expectancy of people with HIV in South Africa is increasing. Which explanation is a reason why?

Accepted Answer

Increased availability of antiretroviral drugs

Answer

Screening of blood used for transfusions

Answer

The development of a vaccine for HIV

Answer

More awareness of how HIV is spread

Question 9

Why does infection of tomato plants with tobacco mosaic virus (TMV)
reduce the yield of tomatoes?

Accepted Answer

It destroys leaf cells so reduces the rate of photosynthesis

Answer

It infects root cells so water uptake is reduced

Answer

It destroys stem cells so transport of substances is reduced

Answer

It infects fruit so they fall off the plant before ripening

Question 10

Which method would not be an effective method for preventing the spread of measles?

Accepted Answer

vaccination

Answer

using a handkerchief

Answer

hand washing

Answer

destroying vectors

Question 11

The table shows some characteristics of some communicable diseases. Which row shows characteristics shown by salmonella food poisoning only?

Accepted Answer

B

Answer

D

Answer

A

Answer

C

Question 12

How does removing standing water prevent the spread of malaria?

Accepted Answer

it prevents vectors from breeding

Answer

it directly kills mosquitos

Answer

it directly kills the protist parasites

Answer

it prevents mosquitos from biting

Question 13

Why are all viruses pathogens?

Accepted Answer

They cannot replicate without destroying cells

Answer

They need vectors to transfer from host to host

Answer

They are not classed as living organisms

Answer

They cannot be destroyed by antibiotics

Question 14

The table shows some characteristics of bacteria and viruses. Which row shows the characteristics of bacteria only?

Accepted Answer

A

Answer

B

Answer

C

Answer

D

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