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Quiz Chapter 4: Human Health

10 questions ยท Form 2 Science Bab 4: Human Health

Question 1 of 10Score: 0

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

Full Question List & Answer Key

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

1. 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.

2. 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.

3. A person bitten by a venomous snake is immediately injected with antivenom containing ready-made antibodies. What form of immunity is this?

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

Injecting manufactured antiserum/antibodies directly into a patient provides immediate protection via artificial passive immunity.

4. What is the primary mechanism utilized by the second line of defence to neutralize pathogens?

  1. Sweat secretion
  2. Phagocytosis by white blood cells
  3. Antibody binding by lymphocytes
  4. Hydrochloric acid secretion in the stomach
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Answer: B

The second line of defence uses non-specific white blood cells (phagocytes) to perform phagocytosis, engulfing and destroying pathogens.

5. 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.

6. Which fungal infection is transmitted via direct skin contact or sharing personal items like towels?

  1. Measles
  2. Ringworm
  3. Malaria
  4. Typhoid
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Answer: B

Ringworm (and tinea) is a fungal skin infection spread through direct physical contact or shared personal hygiene items.

7. 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.

8. Which disease is transmitted via water contaminated with Vibrio cholerae bacteria?

  1. Ringworm
  2. Cholera
  3. Dengue
  4. Influenza
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Answer: B

Cholera is a waterborne disease caused by ingesting water or food contaminated with *Vibrio cholerae*.

9. 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.

10. Which action helps break the transmission chain of waterborne infectious diseases?

  1. Sleeping under mosquito nets
  2. Boiling water before drinking
  3. Applying sunscreen lotion
  4. Exercising regularly outdoors
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Answer: B

Boiling water kills pathogens like *Vibrio cholerae* and *Salmonella typhi*, preventing waterborne infection.

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