O LevelBiologyCambridgeTopic Questions12. Disease & Immunity12.1 Disease

Disease (Cambridge O Level Biology)

Topic Questions

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1
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What is a pathogen?

  • A transmissible disease

  • A phagocyte that engulfs bacteria

  • A disease-causing organism

  • A bacterial cell

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2
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Which body defence listed below acts as a chemical barrier?

  • Mucus lining the airways

  • Antibody production

  • Hairs in the nose

  • Phagocytosis

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3
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Which of the options below is an example of a transmissible disease?

  • Obesity

  • Tooth decay

  • Cholera

  • Rickets

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41 mark

Which action can prevent the spread of the human immunodeficiency virus (HIV)?

  • keeping healthy by taking regular exercise 

  • avoiding contact with saliva

  • breast-feeding babies

  • using condoms during sexual intercourse

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1
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The human body has a number of barriers to prevent infection by pathogens, some of which are listed below.

  1. Skin
  2. Mucus
  3. Hairs in the nose
  4. Antibodies
  5. Stomach acid

Which of these are examples of mechanical barriers?

  • 1 and 3

  • 1, 2 and 4

  • 2 and 4

  • 1, 3 and 5

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2
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Which of the diseases listed below are not caused by pathogens?

  1. Coronary Heart Disease
  2. Cholera
  3. AIDS
  4. Scurvy

  • 2 only

  • 1 and 4

  • 2 and 3

  • 2, 3 and 4

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3
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Which of the following diseases can be transmitted by contact with contaminated surfaces?

  • Athletes foot and malaria

  • Salmonella and typhoid

  • Influenza and dengue fever

  • Salmonella and athletes foot

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4
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Which of the following can occur with a cholera infection?

  1. Loss of salts from the blood
  2. Loss of water from the blood
  3. Blockage of the small intestine
  4. Persistent diarrhoea

  • 1 and 4

  • 1, 2 and 4

  • 3 and 4

  • All 4

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51 mark

What are the effects of drinking a large quantity of alcohol on the human body? 

  effects on the body
acts as a reaction time damages the
A depressant decreases kidney
B depressant increases liver
C stimulant increases kidney
D stimulant decreases liver

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61 mark

What are the roles of the female mosquito and the malarial pathogen in the spread of malaria?

  female mosquito malarial pathogen
A parasite vector
B parasite parasite
C vector parasite
D vector vector

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71 mark

Which words all describe the organism that causes malaria? 

  • microscopic, parasite, sexually transmitted

  • microscopic, parasite, pathogen 

  • mosquito, pathogen, vector

  • parasite, sexually transmitted, vector

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