CBSE Class 12 Biology Human Health and Disease MCQs Set B

Question. Which of the following tissue constitutes about 50% of lymphoid tissue in human body?
a) Spleen
b) Mucosa associated lymphoid tissue
c) Lymph nodes
d) None of these

Answer : B

Question. Which of the following is incorrect for AIDS?
a) The word AIDS stands for Acquired Immune Deficiency Syndrome
b) This is a congenital disease
c) AIDS was first reported in 1981
d) In the last twenty-five years or so, it has spread all over the world, killing more than 25 million persons

Answer : B

Question. Which statement correctly defines Bohr effect?
a) rise in P50 with a decrease in CO₂ concentration
b) rise in P50 with an increase in CO₂ concentration
c) rise in P50 with an increase in pH and decrease in PCO₂
d) fall in P50 with a decrease in pH

Answer : B

Question. Carbonic anhydrase is found in high concentration in :
a) leucocytes
b) blood plasma
c) erythrocytes
d) lymphocytes

Answer : C

Question. Asphyxia occurs due to
a) Combination of hypoxia and hypercapnea
b) Combination of hypoxia and hypocapnea
c) Combination of hyperoxamia and hypocapnea
d) Combination of hyperoxamia and hypercapnea

Answer : A

Question. Reduction in respiratory surface of the lungs due to break down of partition in the alveoli is known as
a) Asphyxia
b) Bronchitis
c) Asthma
d) Emphysema

Answer : D

Question. Cirrhosis of liver is caused by the chronic intake of
a) opium
b) alcohol
c) tobacco (chewing)
d) cocaine.

Answer : B

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. L.S.D. is
a) hallucinogenic
b) sedative
c) stimulant
d) tranquilliser.

Answer : A

Question. Which of the following pairs is not correctly matched ?
a) Cholera – Vibrio cholerae
b) German measles – Rubella virus
c) Whooping cough – Bordetella pertussis
d) Tetanus – Pasteurella pestis

Answer : D

Question. AIDS is caused by
a) DNA virus
b) RNA virus
c) Bacteria
d) Protozoan

Answer : B

Question. HIV belongs to
a) Bacteria
b) Retrovirus
c) Adenovirus
d) None of these

Answer : B

Question. Respiratory centre of brain is stimulated by
a) Carbon dioxide content in venous blood
b) Carbon dioxide content in arterial blood
c) Oxygen content in venous blood
d) Oxygen content in arterial blood

Answer : B

Question. Which part of the human brain controls the breathing movements?
a) cerebrum
b) cerebellum
c) diencephalon
d) medulla oblongata

Answer : D

Question. Saline solution is given to patients of cholera because
a) Na+ prevents water loss from body
b) NaCl function as regulatory material
c) NaCl produces energy
d) NaCl is antibacterial.

Answer : A

Question. Widal test is carried out to test
a) malaria
b) diabetes mellitus
c) HIV/AIDS
d) typhoid fever.

Answer : D

Question. Short-lived immunity acquired from mother to fetus across placenta or through mother’s milk to the infant is categorised as
a) active immunity
b) passive immunity
c) cellular immunity
d) innate non-specific immunity.

Answer : B

Question. Which malarial parasite has longest incubation period?
a) Plasmodium vivax
b) Plasmodium falciparum
c) Plasmodium malariae
d) Plasmodium ovale

Answer : C

Question. Which of the following statement is not true for AIDS?
a) HIV is not spread by mere touch or physical contact
b) It is spread only through body fluids
c) It is, hence, imperative, for physical and psychological wellbeing, that the HIV infected person is not isolated from family and society
d) There is no time lag between the infection and appearance of AIDS symptoms

Answer : D

Question. Which cells of the body are known as HIV factory?
a) Lymphocytes
b) Macrophages
c) Eosinophils
d) Basophils

Answer : B

Question. Rate and depth of respiration shall increase when
a) Oxygen concentration increases
b) CO₂ concentration increases
c) Bicarbonate concentration increases
d) Bicarbonate concentration decreases

Answer : B

Question. Medullary inspiratory centre is under
a) Nervous control
b) Physical control
c) Chemical control
d) Electric control Disorders

Answer : C

Question. If you suspect major deficiency of antibodies in a person, to which of the following would you look for confirmatory evidence?
a) Haemocytes
b) Serum globulins
c) Fibrinogen in plasma
d) Serum albumins

Answer : B

Question. Which one of the following statements is correct?
a) Benign tumours show the property of metastasis.
b) Heroin accelerates body functions.
c) Malignant tumours may exhibit metastasis.
d) Patients who have undergone surgery are given cannabinoids to relieve pain.

Answer : C

Question. Neoplastic cells are form of
a) Normal tissue
b) Malignant tissue
c) Normal cells
d) None of these

Answer : B

Question. The infectious stage of Plasmodium that enters the human body is
a) Trophozoites
b) Sporozoites
c) Female gametocytes
d) Male gametocytes

Answer : B

Question. Respiratory mechanism is controlled by :
a) Central nervous system
b) Sympathetic nervous system
c) Parasympathetic nervous system
d) Autonomic nervous system

Answer : A

Question. Which of the following is not an autoimmune disease?
a) Psoriasis
b) Rheumatoid arthritis
c) Alzheimer’s disease
d) Vitiligo

Answer : C

Question. Which one of the following techniques is safest for the detection of cancers?
a) Magnetic resonance imaging (MRI)
b) Radiography (X-ray)
c) Computed tomography (CT)
d) Histopathological studies

Answer : A

Question. African sleeping sickness is due to
a) Plasmodium vivax transmitted by tse-tse fly
b) Trypanosoma lewsii transmitted by bed bug
c) Trypanosoma gambiense transmitted by Glossina palpalis
d) Entamoeba gingivalis spread by housefly.

Answer : C

Question. Malaria fever coincides with liberation of
a) cryptomerozoties
b) metacryptomerozoites
c) merozoites
d) trophozoites.

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. Controlling centre of normal breathing in mammals lies in :
a) Cerebrum
b) Cerebellum
c) Midbrain
d) Medulla oblongata

Answer : D

Question. Rate of breathing is controlled by :
a) the amount of freely available oxygen
b) muscular functions of the body
c) carbon dioxide
d) stress

Answer : C

Question. Infection of Ascaris usually occurs by
a) Tse-tse fly
b) mosquito bite
c) drinking water containing eggs of Ascaris
d) eating imperfectly cooked pork.

Answer : C

Question. If all ponds and puddles are destroyed, the organism likely to be destroyed is
a) Leishmania
b) Trypanosoma
c) Ascaris
d) Plasmodium.

Answer : D

Question. Which of the following symptoms indicate red sickness?
a) Nausea and loss of hair
b) Ulcerated skin, nausea and loss of hair
c) Red and ulcerated skin
d) Nausea and anaemia

Answer : B