Human Health and Diseases is a Class 12 Biology chapter that carries about 3.5% of the Biology questions in NEET. Practise it with 54 questions covering 3 topics, each with an explanation.
Sample questions on Human Health and Diseases with answers
8 questions from the practice bank, spread across the chapter's topics. The full set is in the app.
Question 1: Cancer and Its Detection
Anabolic steroids used by sportspersons can cause in males:
- A acne, aggressiveness, mood swings, and reduction of the size of the testicles
- B a rise in immunity
- C increased height
- D better memory
Answer: A. acne, aggressiveness, mood swings, and reduction of the size of the testicles
Why: In females they cause masculinisation.
Question 2: Common Communicable Diseases
Malaria is caused by which type of pathogen?
- A a bacterium
- B a virus
- C a protozoan (Plasmodium)
- D a fungus
Answer: C. a protozoan (Plasmodium)
Why: Malaria is caused by the protozoan parasite Plasmodium, transmitted by the female Anopheles mosquito.
Question 3: Immunity and Vaccination
An antibody (immunoglobulin) molecule consists of:
- A three chains
- B one polypeptide chain
- C eight light chains
- D four polypeptide chains: two light and two heavy
Answer: D. four polypeptide chains: two light and two heavy
Why: It is represented as H₂L₂.
Question 4: Cancer and Its Detection
Coca alkaloid, or cocaine, is obtained from:
- A Cannabis
- B Papaver somniferum
- C Atropa belladonna
- D Erythroxylum coca, and it interferes with the transport of the neurotransmitter dopamine
Answer: D. Erythroxylum coca, and it interferes with the transport of the neurotransmitter dopamine
Why: It is a potent stimulant of the central nervous system.
Question 5: Common Communicable Diseases
The test commonly used to detect HIV infection in a patient is:
- A Rapid plate test only
- B Mantoux test
- C Widal test
- D ELISA
Answer: D. ELISA
Why: ELISA detects antibodies against HIV; Widal is for typhoid.
Question 6: Immunity and Vaccination
Active immunity is acquired when:
- A ready-made antibodies are injected into the body
- B the body produces its own antibodies in response to an antigen
- C antibodies are passed from mother to fetus only
- D no immune response occurs
Answer: B. the body produces its own antibodies in response to an antigen
Why: Active immunity develops when the body's own immune system produces antibodies in response to exposure to an antigen (via infection or vaccination), often providing long-lasting protection.
Question 7: Cancer and Its Detection
The use of drugs or alcohol by adolescents is influenced by:
- A good family support only
- B curiosity, the need for adventure, stress and peer pressure
- C education only
- D religious teaching
Answer: B. curiosity, the need for adventure, stress and peer pressure
Why: Education and counselling help in prevention.
Question 8: Common Communicable Diseases
Elephantiasis (filariasis) in humans is caused by:
- A a virus
- B thread-like filarial worms transmitted by mosquito bite
- C a protozoan parasite
- D a bacterium
Answer: B. thread-like filarial worms transmitted by mosquito bite
Why: Filarial worms such as Wuchereria transmitted by Culex mosquitoes lodge in the lymphatic vessels, causing chronic inflammation and gross swelling of the limbs.