CBSE Class 12 Biology Human Health and Disease MCQs Set C

Question. NACO stands for
a) National AIDS Control Option
b) National AIDS Central Organization
c) National AIDS Control Organization
d) National AIDS Campaign Organization

Answer : C

Question. Cancer cells shows loss of which of the following property of cells
a) Cell culture
b) Cell division
c) Cell enlargement
d) Contact inhibition

Answer : D

Question. Respiratory movements are controlled by
a) Cerebellum
b) Cerebrum
c) Medulla oblongata
d) Crura cerebri

Answer : C

Question. Pneumotaxic centre occurs in
a) Cerebellum
b) Cerebrum
c) Medulla oblongata
d) Pons varolii

Answer : D

Question. Which part of poppy plant is used to obtain the drug “smack”?
a) Flowers
b) Latex
c) Roots
d) Leaves

Answer : B

Question. A young drug addict used to show symptoms of depressed brain activity, feeling of calmness, relaxation and drowsiness. Possibly he was taking
a) Amphetamine
b) Marijuana
c) Pethadine
d) Valium

Answer : D

Question. When children play bare footed in pools of dirty water and flood water, they may suffer from diseases like
a) leptospirosis and bilharizia
b) malaria, amoebic dysentery and leptospirosis
c) bilharizia, infective hepatitis and diarrhoea
d) guinea worm infection, elephantiasis and amoebic dysentery

Answer : A

Question. Which of the following immune responses is responsible for rejection of kidney graft?
a) Cell-mediated immune response
b) Auto-immune response
c) Humoral immune response
d) Inflammatory immune response

Answer : A

Question. Which one of the following statements is correct with respect to AIDS?
a) The HIV can be transmitted through eating food together with an infected person.
b) Drug addicts are least susceptible to HIV infection.
c) AIDS patients are being fully cured cent per cent with proper care and nutrition.
d) The causative HIV retrovirus enters helper T-lymphocytes thus reducing their numbers.

Answer : D

Question. Nicotine acts as a stimulant, because it mimics the effect of
a) testosterone
b) dopamine
c) thyroxine
d) acetylcholine.

Answer : D

Question. Which of the following will be curable in next two decades?
a) Tuberculosis
b) Cancer
c) Poliomyelitis
d) None of these

Answer : B

Question. Which of the following is based upon the principle of antigen-antibody interaction?
a) PCR
b) ELISA
c) r-DNA technology
d) RNA

Answer : B

Question. lnfiammation of the lung covering causing , severe chest pain is
a) Emphysema
b) Pleurisy
c) Asphyxia
d) Hypoxia

Answer : B

Question. In which disease does mosquito transmitted pathogen cause chronic inflammation of lymphatic vessels?
a) Elephantiasis
b) Ascariasis
c) Ringworm disease
d) Amoebiasis

Answer : A

Question. Which one of the following pairs of diseases is viral as well as transmitted by mosquitoes?
a) Elephantiasis and dengue
b) Yellow fever and sleeping sickness
c) Encephalitis and sleeping sickness
d) Yellow fever and dengue

Answer : D

Question. HIV has a protein coat and genetic material
a) ss RNA
b) ds RNA
c) ss DNA
d) ds DNA

Answer : A

Question. An insect bite may result in inflammation of that spot. This is triggered by the alarm chemicals such as
a) histamine and dopamine
b) histamine and kinins
c) interferons and opsonin
d) interferons and histones

Answer : B

Question. Amoebiasis is caused by
a) Entamoeba histolytica
b) Taenia solium
c) Plasmodium vivax
d) E. coli

Answer : A

Question. When man inhales air containing normal concentration of O₂, but also carbon monoxide, he suffers from suffocation because :
a) CO reacts with O₂ reducing percentage of O₂ in the air
b) Haemoglobin combines with CO instead of with O₂ and product cannot dissociate
c) CO affects the diaphragm and intercostal muscles
d) CO affects the nerve of the lungs

Answer : B

Question. Number of RBCs per unit volume of blood is likely to be higher in a person living at high altitudes, because:
a) air clean and unpolluted
b) more sunshine is available
c) air is less dense
d) vegetation gives out more O₂

Answer : C

Question. Common cold is not cured by antibiotics because it is
a) caused by a virus
b) caused by a Gram-positive bacterium
c) caused by a Gram-negative bacterium
d) not an infectious disease.

Answer : A

Question. Antigen is a substance which
a) lowers body temperature
b) destroys harmful bacteria
c) triggers the immune system
d) is used as an antidote to poison

Answer : C

Question. If a person shows production of interferons in his body, the chances are that he has got an infection of
a) tetanus
b) malaria
c) typhoid
d) measles.

Answer : D

Question. Antigens are present
a) inside the cytoplasm
b) on nuclear membrane
c) inside the nucleus
d) on cell surface.

Answer : D

Question. CO₂ is transported as :
a) dissolved in blood plasma
b) as bicarbonate
c) in carbaminohaemoglobin
d) All of the above

Answer : D

Question. Carbon dioxide amount in atmosphere is :
a) 3%
b) 0.3%
c) 0.04%
d) 40%

Answer : C

Question. Analgesic drugs
a) form tissues
b) relieve pain
c) relieve fatigue
d) cause pain.

Answer : B

Question. Grafted kidney may be rejected in a patient due to
a) passive immune response
b) innate immune response
c) humoral immune response
d) cell-mediated immune response.

Answer : D

Question. Opium is obtained from
a) Oryza sativa
b) Coffea arabica
c) Thea sinensis
d) Papaver somniferum

Answer : D

Question. Which of the following is a pair of viral diseases?
a) Common cold, AIDS
b) Dysentery, common cold
c) Typhoid, tuberculosis
d) Ringworm, AIDS

Answer : A

Question. Determination of oxygen carried by haemoglobin is done by
a) pH
b) Partial pressure of oxygen
c) Partial pressure of carbon dioxide
d) All the above Regulation

Answer : C