Class 12 Biology Chapter 8: Human Health and Disease – 100 MCQs with Answers
1. Typhoid fever is caused by:
Answer: A) Salmonella typhi
2. The causative agent of malaria is:
Answer: C) Plasmodium
3. AIDS is caused by:
Answer: B) Virus
4. Widal test is used for diagnosis of:
Answer: C) Typhoid
5. The vector for dengue fever is:
Answer: C) Aedes
6. HIV mainly attacks:
Answer: C) Helper T cells
7. BCG vaccine is used against:
Answer: B) Tuberculosis
8. The parasite causing malaria in humans is:
Answer: D) All the above
9. Immunity present at birth is called:
Answer: A) Innate
10. The antibody produced in primary immune response:
Answer: B) IgM
11. Sickle cell anaemia is a:
Answer: B) Hereditary disease
12. The polio vaccine was developed by:
Answer: C) Jonas Salk
13. Which type of immunity is injected when antivenom is given?
Answer: A) Passive acquired
14. The main barrier for entry of pathogens in the body is:
Answer: B) Skin
15. The drug for treating malaria is:
Answer: C) Quinine
16. The common allergen in dust is:
Answer: D) All
17. Cancer causing agents are called:
Answer: B) Carcinogens
18. Interferons are produced in response to:
Answer: C) Virus
19. The causative agent of syphilis:
Answer: A) Treponema pallidum
20. Filariasis is transmitted by:
Answer: B) Culex
21. The main symptom of asthma is:
Answer: B) Wheezing
22. The immunity acquired after infection is:
Answer: A) Natural active
23. Rabies is caused by:
Answer: B) Virus
24. The cell responsible for producing antibodies:
Answer: B) B lymphocyte
25. The substance not associated with allergy:
Answer: C) Interleukin
26. Edema in legs is caused by:
Answer: B) Filariasis
27. An example of a zoonotic disease:
Answer: B) Rabies
28. The host cell for Plasmodium sexual cycle is:
Answer: B) Mosquito
29. A non-infectious disease is:
Answer: A) Diabetes
30. The human immunodeficiency virus’s genome is:
Answer: B) RNA
31. Tuberculosis mainly affects:
Answer: D) Lungs
32. Which immunoglobulin passes placenta?
Answer: D) IgG
33. Germ theory of disease was proposed by:
Answer: B) Pasteur
34. Disease example of protozoan pathogen:
Answer: A) Malaria
35. Kwashiorkor is due to deficiency of:
Answer: A) Protein
36. The drug penicillin was discovered by:
Answer: A) Fleming
37. The causative agent of influenza is:
Answer: A) Virus
38. AIDS damages:
Answer: A) WBC
39. Which substance causes allergy symptoms?
Answer: A) Histamine
40. Cancer can be detected by:
Answer: D) All
41. Which is a deficiency disease?
Answer: B) Rickets
42. The causative organism for leprosy:
Answer: B) Mycobacterium leprae
43. Vaccine for polio is:
Answer: A) Salk vaccine
44. Carriers can transmit:
Answer: A) Infectious disease
45. Immunisation protects against:
Answer: B) Only infectious
46. The antibody in tears and saliva is:
Answer: C) IgA
47. Schizophrenia is a:
Answer: B) Mental disorder
48. Plague is caused by:
Answer: A) Yersinia pestis
49. Chicken pox is caused by:
Answer: B) Virus
50. Common cold virus is:
Answer: C) Rhinovirus
51. The cell-mediated immunity is provided by:
Answer: A) T cells
52. Vaccine for hepatitis B contains:
Answer: C) Recombinant protein
53. Vector for Kala-azar:
Answer: A) Sandfly
54. Haemophilia is an example of:
Answer: C) Genetic disorder
55. Myasthenia gravis is:
Answer: A) Autoimmune disease
56. Which vaccine is given at birth?
Answer: D) Both B & C
57. Causative agent for ringworm:
Answer: A) Fungus
58. Allergy causing antibody:
Answer: B) IgE
59. “Magic bullets” for cancer are called:
Answer: B) Monoclonal antibodies
60. Which is a metabolic disorder?
Answer: A) Diabetes
61. Antibody that acts against blood group antigens:
Answer: A) IgM
62. The toxin produced by Clostridium tetani:
Answer: D) Both A and C
63. Antibiotics are effective against:
Answer: B) Bacteria
64. Ringworm most commonly affects:
Answer: A) Skin
65. The disease caused by deficiency of vitamin C:
Answer: B) Scurvy
66. The causative organism of Mumps:
Answer: A) Virus
67. The cells that kill virus-infected cells:
Answer: A) Killer T
68. Incubation period of rabies:
Answer: C) 1–3 months
69. Biopsy is done to:
Answer: B) Detect cancer
70. Hay fever is:
Answer: B) Allergic reaction
71. Anti-tetanus serum gives:
Answer: A) Passive immunity
72. Alcoholism leads to:
Answer: A) Liver cirrhosis
73. Nicotine acts on:
Answer: A) Central nervous system
74. Withdrawal symptoms occur due to:
Answer: B) Stop of drug
75. Steroids abuse leads to:
Answer: D) All
76. Plasmodium reproduces asexually in:
Answer: B) Human
77. Helper T cells are destroyed by:
Answer: B) AIDS
78. Which is not an STDs:
Answer: B) Tuberculosis
79. Recombinant DNA vaccines are used in:
Answer: A) Hepatitis B
80. Insulin is secreted by:
Answer: B) Beta cells
81. Cancer treatment using chemicals is called:
Answer: B) Chemotherapy
82. Most allergic reactions are mediated by:
Answer: A) IgE
83. ELISA is based on:
Answer: A) Antigen–antibody
84. Malignant tumour differs from benign due to:
Answer: A) Rapid spread
85. Mast cells secrete:
Answer: B) Histamine
86. The most abundant immunoglobulin:
Answer: B) IgG
87. Which organism causes athlete’s foot?
Answer: A) Fungus
88. Common cold is:
Answer: A) Acute
89. The first line of body defence is:
Answer: A) Skin
90. Lymphocytes mature in:
Answer: C) Thymus
91. Tetanus can be prevented by:
Answer: B) DPT vaccine
92. The full form of AIDS is:
Answer: A) Acquired Immuno Deficiency Syndrome
93. Causative agent for tuberculosis:
Answer: A) Mycobacterium tuberculosis
94. The causative agent of ringworm is:
Answer: C) Fungus
95. The vector for Chikungunya is:
Answer: B) Aedes
96. Hepatitis primarily affects:
Answer: C) Liver
97. Rh factor was discovered by:
Answer: A) Landsteiner
98. Alcoholics Anonymous helps in:
Answer: B) Alcohol addiction
99. Opium is obtained from:
Answer: C) Poppy plant
100. “Immunisation” means:
Answer: C) Both