MCQ Question for Class 12 Biology Chapter 8 Human Health and Diseases

Check the below NCERT MCQ Class 12 Biology Chapter 8 Human Health and Diseases with Answers available with PDF free download. MCQ Questions for Class 12 Biology with Answers were prepared based on the latest syllabus and examination pattern issued by CBSE, NCERT and KVS. Our teachers have provided below Human Health and Diseases Class 12 Biology MCQs Questions with answers which will help students to revise and get more marks in exams

Human Health and Diseases Class 12 Biology MCQs Questions with Answers

Refer below for MCQ Class 12 Biology Chapter 7 Human Health and Diseases with solutions. Solve questions and compare with the answers provided below

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

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

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

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

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

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

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

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

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

Question. Metastasis is the property of
(a) Malignant tumor
(b) Benign tumor
(c) Both (a) and (b)
(d) None of these

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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.

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

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

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

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

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.

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

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.

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.

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

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

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

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

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

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

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

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

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.

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

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

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

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

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.

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.

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

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

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.

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

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

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

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

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

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.

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

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