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Quiz Chapter 4: Human Health

10 questions · Form 2 Science Bab 4: Human Health

10 questions · plays in fullscreen

Full Question List & Answer Key

Prefer reading to quizzing? All 10 questions are listed below with the answer and explanation under each one.

1. A student recovers naturally from chickenpox and becomes immune to getting it again. What type of immunity has been acquired?

  1. Natural Active Immunity
  2. Artificial Active Immunity
  3. Natural Passive Immunity
  4. Artificial Passive Immunity
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Answer: A

Recovering from an infection causes the body to produce its own antibodies and memory cells naturally, yielding natural active immunity.

2. Which enzyme present in tears and saliva helps destroy bacterial cell walls as part of the first line of defence?

  1. Amylase
  2. Pepsin
  3. Lysozyme
  4. Lipase
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Answer: C

Lysozyme is an antibacterial enzyme in secretions like tears and saliva that breaks down bacterial cell walls.

3. A newborn baby acquires antibodies through its mother's breast milk. What type of immunity is this?

  1. Natural Active Immunity
  2. Artificial Active Immunity
  3. Natural Passive Immunity
  4. Artificial Passive Immunity
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Answer: C

Receiving pre-formed antibodies naturally through colostrum or breast milk provides natural passive immunity.

4. What does a vaccine injected into a person during artificial active immunisation contain?

  1. Ready-made antibodies extracted from horses
  2. Dead or weakened pathogens (antigens)
  3. Antibiotic chemicals
  4. Active digestive enzymes
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Answer: B

Vaccines contain dead, weakened, or fragmented pathogens that trigger the immune system to produce its own antibodies without causing the full-blown disease.

5. Why is active immunity generally longer-lasting than passive immunity?

  1. Active immunity uses stronger external chemicals
  2. Active immunity stimulates memory cells to recognize pathogens in future infections
  3. Passive immunity causes white blood cells to produce permanent toxins
  4. Passive immunity works only in newborn infants
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Answer: B

Active immunity stimulates the body's immune system to generate memory lymphocytes that retain the ability to produce targeted antibodies for years.

6. Which vector is responsible for transmitting the parasite Plasmodium, which causes Malaria?

  1. Aedes mosquito
  2. Anopheles mosquito
  3. Housefly
  4. Cockroach
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Answer: B

Female Anopheles mosquitoes carry and transmit the Plasmodium protozoan, the pathogen causing malaria.

7. What is an antigen?

  1. An antibody produced by white blood cells
  2. A chemical substance or foreign protein on a pathogen that triggers an immune response
  3. A type of medication used to kill viruses
  4. A harmless digestive enzyme
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Answer: B

An antigen is a foreign protein or molecular structure on pathogens that triggers white blood cells to produce specific antibodies.

8. What happens when an antibody binds to its matching target antigen?

  1. The pathogen is neutralized or clumped together for phagocytosis
  2. The white blood cell turns into a red blood cell
  3. The body loses all natural active immunity
  4. Digestive enzymes in the stomach stop working
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Answer: A

Antibody-antigen binding neutralizes toxins or clumps pathogens (agglutination), making them easier for phagocytes to engulf and digest.

9. Leptospirosis (rat urine fever) is primarily transmitted through water or soil contaminated by which vector?

  1. Housefly
  2. Rat
  3. Aedes mosquito
  4. Tick
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Answer: B

Rats act as the primary host vector for *Leptospira* bacteria, shedding the pathogen through their urine.

10. Which of the following diseases is classified as non-infectious?

  1. Cholera
  2. Tuberculosis
  3. Diabetes Mellitus
  4. Dengue Fever
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Answer: C

Diabetes mellitus is caused by genetic factors or lifestyle habits (lack of insulin production/sensitivity) and cannot be transmitted between people.

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