Class 12 Biology MCQs Chapter – 8
21. Virus infected cells secrete which proteins
( A ) histamines
( B ) colostrum
( C ) interferons
( D ) interleukines
Answer-( C )
22. Which is called first line of defence ?
( A ) Skin & Mucous membrane
( B ) Inflammation
( C ) Complement system
( D ) None
Answer-( A )
23. The genetic material of HIV is
( A ) ds DNA
( B ) ds RNA
( C ) ss DNA
( D ) ss RNA
Answer-( D )
24. An antibody consists of
( A ) H¹L¹
( B ) H²L²
( C ) H²L⁴
( D ) H⁴L⁴
Answer-( B )
25. Humoral immunity is associated with
( A ) T-cells
( B ) B-cells
( C ) Macrophages
( D ) None
Answer-( B )
26. The most abundant Antibody produced against allergens is :
( A ) IgE
( B ) IgA
( C.) IgG
( D ) IgM
Answer-( A )
27. Which of the following disease cannot be cured by taking antibiotics?
( A ) Plague
( B ) Amoebiasis
( C ) Leprosy
( D ) Diptheria
Answer-( B )
28. Passive immunity can be conferred directly by :
( A )vaccines
( B ) antitoxins
( C )colostrum
( D ) T-cells
Answer-( A )
29. The antibody which can cross placental barrier is :
( A ) IgA
( B ) IgE
( C ) IgM
( D ) IgG
Answer-( D )
30. The primary Lymphoid organs are :
( A ) Spleen and thymus
( B ) Bone marrow & thymus
( C ) Bone marrow & lymph nodes
( D) Thymus & MALT
Answer-( B )
31. HIV is a retrovirus that attacks :
( A ) helper T-cells
( B ) killer T-cell
( C ) B-cell
( D ) Neutrophils
Answer-( A )
32. The cell called “HIV factory” is
( A ) helper T-cell
( B ) Macrophage
( C ) WBCs
( D ) Dendritic cells
Answer-( B )
33. Most common cancer in humans is
( A ) Melanoma
( B ) Lymphoma
( C ) Sarcoma
( D ) Carcinoma
Answer-( D )
34. Antibodies are formed by :
( A ) Fibroblasts
( B ) Plasma cells
( C ) Histiocytes
( D) Mast cells
Answer-( B )
35. T-lymphocytes originate from
( A ) bone-marrow
( B ) stomach
( C ) thymus
( D ) liver
Answer-( A )
36. Oncology is the study of :
( A ) Cancer
( B ) Oncogenes
( C ) Both A & B
( D ) Virus
Answer-( A )
37. LSD is got from
( A ) Fungus
( B ) Lichen
( C ) Algae
( D ) Bacterium
Answer-( A )
38. Which one is a stimulant
( A ) LSD
( B ) Cocaine
( C ) Cannabis
( D ) Opium
Answer-( B )
39. Which of the following is an example of autoimmune disease?
( A ) Asthma
( B ) Rheumatoid arthritis
( C ) Cancer
( D ) None of these
Answer-( B )
40. The immediate metabolic changes in the body noticed after consuming tobacco is
( A ) Release of catecholamines due to stimulation of Adrenal gland.
( B ) Sudden increase in BP & Heart beat
( C ) ‘A’ & ‘B’ both
( D ) None of these
Answer-( C )
