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DPP /CB30
1. (c) A special defence system works specially against viral
infection. It has no effect on micro-organism. Cells invaded
by a virus produce an antiviral protein called interferon (IFN).
The latter is released from the infected cell and on reaching
the nearby non-infected cells it makes them resistant to the
virus infection.
2. (c) Syphilis is caused by bacteria Treponema pallidum.
3. (c) The lymphocytes which differentiate in the thymus are
known as the T - lymphocytes. T-lymphocytes are
responsible for the cellular immune response.
4. (b) The major obstacle in transplantation of organs is that the
recipient body does not accept the donor’s organ. The body
defence mechanism rejects & treats the transplanted organ as
a foreign particle and reacts actively.
5. (b) Tranquilizers bring about depression of brain activity and
feeling of calmness. Stimulants stimulate the nervous system,
and increase alertness  and activity. Hallucinogens (Cannabis
products) alters thoughts, perceptions and feelings.
6. (b) Rauwolfia serpentina belong to the family Apocynaceae, its
roots yield a chemical useful for high blood pressure.
7. (d) Tetanus  and typhoid are caused by bacteria. Whooping cough
is caused by bacteria. Sleeping sickness is caused by parasitic
flees. Syphilis is caused by bacteria while AIDS is the final
stage of HIV viral disease. Measles and Rabies are caused by
virus.
8. (a) Allergy means all kinds of untoward reactions manifested in
the body due to hypersensitivity of substances called
allergens. Allergy reactions occur due to liberation of histamine
by tissue cells.
9. (c) Carcinomas are malignant growths of the epithelial tissue
that cover or line the body organs.
10. (c) HIV is a spherical, enveloped virus of about 90-120 nm
diameter. Its nucleocapsid is icosahedral and its genome
consists of a single-stranded RNA filament segmented into
two identical filaments and associated with a “reverse
transcriptase enzyme”.
11. (c)
12. (d) AIDS  is caused by HIV virus and Gonorrhoea is caused by
Neisseria gonorrhoea. Urethritis is inflammation of the
urethra by bacteria. Syphilis is caused by Treponema
pallidum.
13. (c) The saliva in the mouth and the tears from the eyes belong to
physiological barriers.
14. (d) Widal test is used for the diagnosis of typhoid. It is an
agglutination test for the presence of antibodies against the
Salmonella organisms, which cause typhoid fever.
15. (b) Amphetamines bring about increased alertness and
sleeplessness. Hashish is a hallucinogen. Valium is  a
tranquilizer. Valium depresses brain activity and produces
feeling of  calmness,  relaxation  and drowsiness. Morphine
is an opiate narcotic.
16. (c) Whenver our body gets attacked by some foreign invadors,
our body’s immune system produces some chemicals to kill
or to react against the invader. These chemicals are actually
made up of carbohydrates & proteins i.e. glycoproteins called
antibodies.
17. (a) B and T-lymphocytes produce antibodies against pathogen
in the body, if due to some reason B and T-lymphocytes are
damaged the body will not produce antibodies against a
pathogen. Each B cell and T cell is specific for a particular
antigen.
18. (b) Pollen–grains of many species are responsible for some of
the severe allergies and  bronchial affliction in some people
often lead to chronic respiratory disorders - asthma,
bronchitis.
19. (c) Tetanus toxoid is a vaccine consisting of growth products of
Clostridium tetani treated with formaldehyde serving as an
active immunising agent. Hence it is weakened germs. The
first tetanus toxoid (inactivated toxin) was produced in 1924
and was used successfully to prevent tetanus in the armed
services during World War II. In the mid-1940s, tetanus
vaccine was combined with diphtheria toxoid and inactivated
pertussis vaccine to make the combination DTP vaccine for
routine childhood immunization.
20. (d) AIDS (Acquired Immune Deficiency Syndrome) is caused
by HIV retrovirus. The virus destroys the helper T
lymphocytes thus reducing their numbers.
21. (d) 22. (a) 23. (a) 24. (b)
25. (a) Preformed antibodies need to be injected to treat the bite by
a viper snake. It is also a type of immunization which is
called as passive immunization.
Antibodies, produced by B-cells, are typically made of basic
structural units—each with two large heavy chains and two
small light chains. B cells differentiate into plasma cells that
secrete antibodies. Antibodies are proteins that bind to
specific antigens and mark them for destruction by, for
example, making them more recognizable to phagocytic cells.
Rejection of a kidney graft is not a function of B lymphocyte.
26. (b) Infectious diseases are those diseases  that can spread from
one person to another e.g., AIDS. Non-infectious diseases
are those diseases that cannot spread from one person to
another e.g., cancer.
27. (a) Common cold is caused by some 100 types of Rhino vi-
ruses. Symptoms of common cold are irritation of nasal tract,
nasal congestion, flow of mucus, sore throat, sneezing, cough,
headache and slight fever.
Page 2


DPP /CB30
1. (c) A special defence system works specially against viral
infection. It has no effect on micro-organism. Cells invaded
by a virus produce an antiviral protein called interferon (IFN).
The latter is released from the infected cell and on reaching
the nearby non-infected cells it makes them resistant to the
virus infection.
2. (c) Syphilis is caused by bacteria Treponema pallidum.
3. (c) The lymphocytes which differentiate in the thymus are
known as the T - lymphocytes. T-lymphocytes are
responsible for the cellular immune response.
4. (b) The major obstacle in transplantation of organs is that the
recipient body does not accept the donor’s organ. The body
defence mechanism rejects & treats the transplanted organ as
a foreign particle and reacts actively.
5. (b) Tranquilizers bring about depression of brain activity and
feeling of calmness. Stimulants stimulate the nervous system,
and increase alertness  and activity. Hallucinogens (Cannabis
products) alters thoughts, perceptions and feelings.
6. (b) Rauwolfia serpentina belong to the family Apocynaceae, its
roots yield a chemical useful for high blood pressure.
7. (d) Tetanus  and typhoid are caused by bacteria. Whooping cough
is caused by bacteria. Sleeping sickness is caused by parasitic
flees. Syphilis is caused by bacteria while AIDS is the final
stage of HIV viral disease. Measles and Rabies are caused by
virus.
8. (a) Allergy means all kinds of untoward reactions manifested in
the body due to hypersensitivity of substances called
allergens. Allergy reactions occur due to liberation of histamine
by tissue cells.
9. (c) Carcinomas are malignant growths of the epithelial tissue
that cover or line the body organs.
10. (c) HIV is a spherical, enveloped virus of about 90-120 nm
diameter. Its nucleocapsid is icosahedral and its genome
consists of a single-stranded RNA filament segmented into
two identical filaments and associated with a “reverse
transcriptase enzyme”.
11. (c)
12. (d) AIDS  is caused by HIV virus and Gonorrhoea is caused by
Neisseria gonorrhoea. Urethritis is inflammation of the
urethra by bacteria. Syphilis is caused by Treponema
pallidum.
13. (c) The saliva in the mouth and the tears from the eyes belong to
physiological barriers.
14. (d) Widal test is used for the diagnosis of typhoid. It is an
agglutination test for the presence of antibodies against the
Salmonella organisms, which cause typhoid fever.
15. (b) Amphetamines bring about increased alertness and
sleeplessness. Hashish is a hallucinogen. Valium is  a
tranquilizer. Valium depresses brain activity and produces
feeling of  calmness,  relaxation  and drowsiness. Morphine
is an opiate narcotic.
16. (c) Whenver our body gets attacked by some foreign invadors,
our body’s immune system produces some chemicals to kill
or to react against the invader. These chemicals are actually
made up of carbohydrates & proteins i.e. glycoproteins called
antibodies.
17. (a) B and T-lymphocytes produce antibodies against pathogen
in the body, if due to some reason B and T-lymphocytes are
damaged the body will not produce antibodies against a
pathogen. Each B cell and T cell is specific for a particular
antigen.
18. (b) Pollen–grains of many species are responsible for some of
the severe allergies and  bronchial affliction in some people
often lead to chronic respiratory disorders - asthma,
bronchitis.
19. (c) Tetanus toxoid is a vaccine consisting of growth products of
Clostridium tetani treated with formaldehyde serving as an
active immunising agent. Hence it is weakened germs. The
first tetanus toxoid (inactivated toxin) was produced in 1924
and was used successfully to prevent tetanus in the armed
services during World War II. In the mid-1940s, tetanus
vaccine was combined with diphtheria toxoid and inactivated
pertussis vaccine to make the combination DTP vaccine for
routine childhood immunization.
20. (d) AIDS (Acquired Immune Deficiency Syndrome) is caused
by HIV retrovirus. The virus destroys the helper T
lymphocytes thus reducing their numbers.
21. (d) 22. (a) 23. (a) 24. (b)
25. (a) Preformed antibodies need to be injected to treat the bite by
a viper snake. It is also a type of immunization which is
called as passive immunization.
Antibodies, produced by B-cells, are typically made of basic
structural units—each with two large heavy chains and two
small light chains. B cells differentiate into plasma cells that
secrete antibodies. Antibodies are proteins that bind to
specific antigens and mark them for destruction by, for
example, making them more recognizable to phagocytic cells.
Rejection of a kidney graft is not a function of B lymphocyte.
26. (b) Infectious diseases are those diseases  that can spread from
one person to another e.g., AIDS. Non-infectious diseases
are those diseases that cannot spread from one person to
another e.g., cancer.
27. (a) Common cold is caused by some 100 types of Rhino vi-
ruses. Symptoms of common cold are irritation of nasal tract,
nasal congestion, flow of mucus, sore throat, sneezing, cough,
headache and slight fever.
28. (c) Elephantiasis or filariasis is caused by a number of worms.
However, in India  only two types of worms are responsible
for this disease, Wuchereria bancrofti and W. malayi. This
disease is transmitted by female Culex mosquitoes. Elephan-
tiasis affects lymphatic vessels  of the lower limbs.
29. (d)
30. (d) Hepatitis B is a viral disease, transmitted through both blood
and sexual intercourse.
31. (d) Plague is a bacterial disease caused by Yersinia pestis. Symp-
toms of this disease are high fever and a bubo in the groin or
armpit. It is primarily a disease of rodents but accidently
affects man. The vector of this disease is rat fleas that carries
germs of plague from rat to rat. When the rats dies of plague,
the fleas leave the dead rat and if any man is nearby, they bite
him and inject some plague germs into his blood. Shigellosis
or bacillary dysentery, is a diarrheal illness resulting from an
acute inflammatory reaction caused by Shigella.
32. (a) Skin amd mucous membrane are the physical barriers that
provide the first line of defence or the external defence. These
barriers prevent the enrty of micro-organisms into the body.
Outer tough layer of the skin, the stratum corneum prevents
the enrty of bacteria and viruses. Mucus secreted by mucous
membrane traps the microorganisms and immobilises them.
33. (a) The substances to which an exaggerated response of the im-
mune system occurs are called allergens. The antibodies pro-
duced to these are of lgE type.
34. (d) If the immune system fails to recognize 'self' from
'non-self' and starts destroying the body’s own cells, this
leads to some malfunctions, which are termed as autoim-
mune diseases. Both rheumatoid arthritus and myasthenia
gravis are autoimmune diseases. In rheumatoid arthritis, in-
flammation of the synovial membrane in synovial joints oc-
curs. When this membrane, which is the source of synovial
fluid, becomes inflamed, it produces too much fluid. Thus,
the joints swell and become extremely painful. Myashtenia
gravis is a chronic disease marked by abnormal fatigability
and weakness of selected muscles. The degree of fatigue is so
extreme that these muscles are temporarily paralysed. In
this disease, antibodies bind to cholinergic receptors on muscle
cells, which impairs the ability of the neurotransmitter ace-
tylcholine to induce muscle contraction.
35. (b) 'A'-lymph nodes, 'B'-Thymus, 'C'-spleen, 'D'-Bone marrow.
Thymus and bone marrow are the primary lymphoid organs
where maturation of T-cells and B-cells take place respec-
tively. Lymph nodes and spleen are the secondary lymphoid
organs where T-cells and B-cells undergo proliferation and
differentiation.
36. (c) When a host is exposed to antigens, which may be in the
form of living or dead microbes or other proteins, antibodies
are produced in the host body. This type of immunity is
called active immunity. Infecting the microbes deliberately
during immunization/vaccination induces active immunity
e.g., polio vaccine.
37. (c) 38. (d)
39. (d) The given figure is of cannabinoid molecule. Cannabinoids
are hallucinogenic chemicals obtained from leaves, resin and
inflorescence of hemp plant, Cannabis sativa. Marijuana,
hashish and ganja and cannabinoids.
40. (c) Cannabinoids bring about euphoria, excitement, sometimes
uncontrolled  laughter and dilation of pupil of eyes. These
days cannabinoids are taken by some sports persons.
41. (d) Rabies, Influenza and AIDS are viral diseases, Amoebiasis,
Ascariasis and Trypanosomiasis are caused by Protozoa;
Taeniasis, Ascariasis and Elephantasis are the diseases caused
by Helminths but Cancer, Tuberculosis and Tetanus are not
related diseases. Tuberculosis and Tetanus are bacterial
diseases while cancer is not.
42. (c) Lipoproteins are conjugated proteins having polypeptides
in association with lipids. Immunoglobulins are the
constituent of antibodies. Interferons (INFs) are a group of
three vertebrate glycoproteins.
Interferon  induces among adjacent cells, as antiviral state by
inducing synthesis of  the enzymes which inhibit the viral
production cycle.
43. (d) 44. (b) 45. (a)
 
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