Students of class 12 Biology should refer to MCQ Questions Class 12 Biology Human Health and Diseases with answers provided here which is an important chapter in Class 12 Biology NCERT textbook. These MCQ for Class 12 Biology with Answers have been prepared based on the latest CBSE and NCERT syllabus and examination guidelines for Class 12 Biology. The following MCQs can help you to practice and get better marks in the upcoming class 12 Biology examination

Chapter 8 Human Health and Diseases MCQ with Answers Class 12 Biology

MCQ Questions Class 12 Biology Human Health and Diseases provided below have been prepared by expert teachers of grade 12. These objective questions with solutions are expected to come in the upcoming Standard 12 examinations. Learn the below provided MCQ questions to get better marks in examinations.

Question. Which is not an opiate narcotic?
(a) Amphetamine
(b) Morphine
(c) Heroin
(d) Pethidine

Question. What is the role of complement in the body’s defence?
(a) It interference with viral replication
(b) It is involved with antibody production
(c) It aids antigen presentation
(d) It causes cell lysis

Question. Chloride shift occurs in response to
(a) HCO-⁺
(b) K⁺
(c) H⁺
(d) Na⁺

Question. Blood analysis of a patient reveals an unusually high quantity of carboxyhaemoglobin content. Which of the following conclusions is most likely to be correct? The patient has been inhaling polluted air containing usually high content of 
(a) Carbon disulphide
(b) Chloroform
(c) Carbon dioxide
(d) Carbon monoxide

Question. Tobacco smoke contains carbon monoxide, which 
(a) Reduces the oxygen-carrying capacity of blood
(b) Causes gastric ulcers
(c) Raises blood pressure
(d) Is carcinogenic

Question. Given below are four matchings of an animal and its kind of respiratory organ
I. Silver fish – Trachea
II. Scorpion – Book lung
III. Sea squirt – Pharyngeal gills
IV. Dolphin – Skin
The correct matching are
(a) II and IV
(b) III and IV
(c) I and IV
(d) I, II and III

Question. When carbon dioxide concentration in blood increases breathing becomes 
(a) Shallower and slow
(b) There is no effect on breathing
(c) Slow and deep
(d) Faster and deeper

Question. The oxygen toxicity is related with 
(a) Blood poisoning
(b) Collapsing of alveolar walls
(c) Failure of ventilation of lungs
(d) Both (a) and (b)

Question. Arrange the following in the order of increasing volume
I. Tidal volume
II. Residual volume
III. Expiratory reserve volume
IV. Vital capacity
(a) I < II < III < IV
(b) I < III < II < IV
(c) I < IV < III < IV
(d) I < IV < II < III

Question. The vital capacity of human lung is equal to 
(a) 500 mL
(b) 4600 mL
(c) 5800 mL
(d) 2300 mL

Question. If the level of carboxyhaemoglobin in blood reaches upto …. the functioning of central nervous system is severely affected which results in death. 
(a) 1 to 2%
(b) 0.20 to 0.30 %
(c) 0.30 to 0.40 %
(d) 0.1 to 5%

Question. After a deep inspiration and maximum expiration, the capacity of lungs is known as 
(a) Vital capacity
(b) Tidal volume
(c) IRV
(d) ERV

Question. Which is called Hamburger shift? 
(a) Hydrogen shift
(b) Bicarbonate shift
(c) Chloride shift
(d) Sodium shift

Question. Left shift of oxyhaemoglobin curve is noticed under 
(a) Normal temperature and pH
(b) Low temperature and high pH
(c) Low pH and high temperature
(d) Low pH and low temperature

Question. Read the following statements and select the correct one
(a) The H⁺ released from carbonic acid combines with haemoglobin to form haemoglobinic acid (b) Oxyhaemoglobin of erythrocytes is alkaline
(c) More than 70% of carbon dioxide is transferred from tissue to the lungs in the form of carbamino compounds
(d) In lungs, the oxygen from the alveolus reaches the blood through active transport

Question. In blood, carbon dioxide is transported majorly as
(a) Sodium carbonate
(b) Carboxyhaemoglobin
(c) Bicarbonate
(d) Carbon dioxide as such

Question. Pick the correct statement
(a) The contraction of internal intercostal muscles lifts up the ribs
(b) The RBCs transports oxygen only
(c) Healthy man can inspire approximately 500 ml of air per minute
(d) During expiration, the intrapulmonary pressure is slightly higher than surrounding atmospheric pressur

Question. Which one is the cofactor of carbonic anhydrase? 
(a) Iron
(b) Zinc
(c) Copper
(d) Magnesium

Question. Choose the correct statement from the following.
(a) Widal test is used for detect Cholera
(b) Restriction endonuclease is found in HIV.
(c) Malaria is caused by female Anopheles mosquito.
(d) Adult humans possess 26 cervical vertebrae.

Question. ‘Bhang’ and ‘Ganja’ are
(a) Extract of hemp plant – Cannabis sativa
(b) Ripe poppy fruits and leaves
(c) Dried leaves, flowers and buds of Cannabis indica plant
(d) None of above

Question. A large quantity of monoclonal antibodies are produced from –
(a) B-cells
(b) Myeloma cells
(c) Hybridoma cells
(d) T-Lymphocytes

Question. Which of the following addictive habit could lead to danger of urinary bladder, throat and lungs cancer?
(a) Tar
(b) Morphine
(c) Heroin
(d) LSD

Question. A patient in diagnosed with internal bleeding muscular pain, anemia, blockage of intestinal passage. He is most likely suffering from:
(a) Filariasis
(b) Amoebiasis
(c) Ascariasis
(d) Malaria

Question. The two most important property of malignant tumors are:
(a) metastasis and angiogenesis
(b) metastasis and contact inhibition
(c) metastasis and apoptosis
(d) metastasis and controlled division

Question. Which of the following is an incorrect statement about cannabinoids?
(a) Cannabinoids are the group of chemicals that interact with cannabinoids receptors present mainly in the brain and gastrointestinal tract.
(b) Cannabinoids are naturally obtained from the inflorescence of the Cannabis sativa plant.
(c) Cannabinoids includes marijuana, hashish, charas and ganja.
(d) Cannabinoids are generally taken by inhalation and oral ingestion, which affect the cardiovascular system of the body.

Question. Select the set of correct statements.
P. Metastasis is not the property of benign tumours.
Q. Cancer cannot be induced by chemical agents.
R. Biopsy and histopathological studies are important tools for the diagnosis of cancer.
(a) P, Q
(b) Q, R
(c) P, R
(d) All

Question. Given the leaves are of a plant which is a source of:

(a) Heroin
(b) Morphine
(c) Marijuana
(d) Cocaine

Question. An antibody molecule is represented as H₂L₂. This implies that
(a) Each antibody has four antigen-binding sites.
(b) Each antibody molecule has four peptide chains two small called light chains and two longer called heavy chains.
(c) There are 2 interchain disulphide bonds.
(d) There are 2 intrachain disulphide bonds.

Question. A person likely to develop tetanus us immunized by administering
(a) performed antibodies
(b) wide spectrum antibotics
(c) weakened germs
(d) dead germs.

Question. The term ‘Health’ is defined in many ways. The most accurate definition of the health would be:
(a) Health is the state of body and mind in a balanced condition
(b) Health is the reflection of a smiling face
(c) Health is a state of complete physical, mental and social well-being
(d) Health is the symbol of economic prosperity.

Question. The clinical test that is used for diagnosis of typhoid is
(a) ELISA
(b) ESR
(c) PCR
(d) Widal

Question. Which of the following glands is large sized at birth but reduces in size with ageing?
(a) Pineal
(b) Pituitary
(c) Thymus
(d) Thyroid

Question. Haemozoin is a
(a) precursor of hemoglobin
(b) toxin released from Streptococcus infected cells
(c) toxin released from Plasmodium infected cells
(d) toxin released from Haemophilus infected cells

Question. Which of the following is not the causal organism for ringworm?
(a) Microsporum
(b) Trichophyton
(c) Epidermophyton
(d) Macrosporum

Question. HIV that causes AIDS, first starts destroying
(a) helper T-lymphocytes
(b) B-lymphocytes
(c) leucocytes
(d) thrombocytes

Question. Antibodies in our body are complex
(a) glycoproteins
(b) lipoproteins
(c) steroids
(d) prostaglandins

Question. LSD is obtained from
(a) Erythroxylum coca
(b) Cannabis sativa
(c) Claviceps purpurea
(d) Papaver somniferum

Question. Diseases are broadly grouped into infectious and non-infectious diseases.
In the list given below, identify the infectious diseases.
(i) Cancer (ii) Influenza (iii) Allergy (iv) Small pox
(a) (i) and (ii)
(b) (ii) and (iii)
(c) (iii) and (iv)
(d) (ii) and (iv)

Question. The sporozoites that cause infection when a female Anopheles mosquito bites a person, are formed in
(a) liver of the person
(b) RBCs of mosquito
(c) salivary glands of mosquito
(d) gut of mosquito

Question. Dengue in humans is caused by
(a) Viruses
(b) Bacteria
(c) Fungi
(d) Helminthes

Question. The disease chikungunya is transmitted by
(a) house fly
(b) Aedes mosquito
(c) cockroach
(d) female Anopheles

Question. Many diseases can be diagnosed by observing the symptoms in the patient. Which group of symptoms are indicative of pneumonia?
(a) Difficulty in respiration, fever, chills, cough, headache
(b) Constipation, abdominal pain, cramps, blood clots
(c) Nasal congestion and discharge, cough, constipation, headache
(d) High fever, weakness, stomach pain, loss of appetite and constipation

Question. In malignant tumors, the cells proliferate, grow rapidly and move to other parts of the body to form new tumors. This stage of disease is called
(a) metagenesis
(b) metastasis
(c) teratogenesis
(d) mitosis

Question. When an apparently healthy person is diagnosed as unhealthy by a psychiatrist, the reason could be that
(a) the patient was not efficient at his work
(b) the patient was not economically prosperous
(c) the patient shows behavioural and social maladjustment
(d) he does not take interest in sports

Question. Which of the following are the reason(s) for rheumatoid arthritis? Choose the correct option.
(i) The ability to differentiate pathogens or foreign molecules from self cells increases.
(ii) Body attacks self cells
(iii) More antibodies are produced in the body
(iv) The ability to differentiate pathogens or foreign molecules from self cells is lost
(a) (i) and (ii)
(b) (ii) and (iv)
(c) (iii) and (iv)
(d) (i) and (iii)

Question. B-lymphocytes are associated with
(a) Humoral immunity
(b) Inflammatory response
(c) Cell mediated immunity
(d) Phagocytosis

Question. The substance produced by a cell in viral infection that can protect other cells from further infection is
(a) serotonin
(b) colostrum
(c) interferon
(d) histamine

Question. Lysozyme that is present in perspiration, saliva and tears, destroys
(a) certain types of bacteria
(b) all viruses
(c) most virus-infected cells
(d) certain fungi

Question. Increased asthmatic attacks in certain seasons are related to
(a) eating fruits preserved in tin containers
(b) inhalation of seasonal pollen
(c) low temperature
(d) hot and humid environment.

Question. To which type of barriers under innate immunity, do the saliva in the mouth and the tears from the eyes, belong?
(a) Physiological barriers
(b) Physical barriers
(c) Cytokine barriers
(d) Cellular barriers

Question. Transplantation of tissues/organs to save certain patients often fails due to rejection of such tissues/organs by the patient. Which type of immune response is responsible for such rejections?
(a) Auto-immune response
(b) Humoral immune response
(c) Physiological immune response
(d) Cell-mediated immune response

Question. Which of the following antibodies form innate immunity?
(a) IgE
(b) IgD
(c) IgM
(d) IgG

Question. Tobacco consumption is known to stimulate secretion of adrenaline and nor-adrenaline. The component causing this could be
(a) nicotine
(b) tannic acid
(c) curamin
(d) catechin

Question. Which of the following is not a lymphoid tissue?
(a) Spleen
(b) Tonsils
(c) Pancreas
(d) Thymus

Question. In which of the following disease, there is always a time lag between the infection and appearance of the symptoms of that particular disease?
(a) AIDS
(b) Allergy
(c) Cancer
(d) Alcoholism

Question. Which of the following disease is confirmed by ‘widal test’?
(a) Tuberculosis
(b) Typhoid
(c) Plague
(d) Tetanus

Question. The toxic substance, ‘haemozoin’, related to the high fever and chill, is released during which of the following disease?
(a) Dengue
(b) Malaria
(c) Diphtheria
(d) Phenumonia

Question. Malignant malaria is caused by the which of the following species of Plasmodium ?
(a) vivax
(b) malariae
(d) ovale
(d) falciparum

Question. Which of the following is the most accurate definition of infection?
(a) The presence of microorganism in a particular location.
(b) The disruption of normal host functions by microorganisms.
(c) The survival and reproduction of microorganisms in a host.
(d) The appearance of symptoms in a host, caused by microorganisms.

Question. Which is not immunity related disease ?
(a) AIDS |
(b) Polio
(c) Cancer
(d) Small pox

Question. A person suffering from a disease caused by Plasmodium experiences recurring chill and fever at the time when
(a) The sporozoites released from RBCs are being rapidly killed and broken down inside speen.
(b) The trophozoites reach maximum growth and give out certain toxins.
(c) The parasite after its rapid multiplication inside RBCs ruptures them, releasing the stage to enter fresh RBCs.
(d) The microgametocytes and megagametocytes are being destroyed by the WBCs.

Question. Which of the following non-infectious disease is a major cause of death in human beings?
(a) AIDS
(b) Cirrhosis
(c) Cancer
(d) Asthma

Question. Which of the following endocrine glands is often referred in relation with AIDS?
(a) Thyroid
(b) adrenal
(c) Thymus
(d) Pancreas

Question. Identify the site where Wuchereria bancrofti is normally found on human body.
(a) Lymphatic vessels of the lower limbs
(b) Muscles of the legs
(c) Blood vessels of the thigh region
(d) Skin between the fingers

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

Question. Food poisoning is caused by
(a) Entamoeba histolytica
(b) Escherichia coli
(c) Clostridium botulinum
(d) Corynebacterium diphtheriae

Question. Cancer cells are more easily damaged by radiation than normal cells because they are
(a) non-dividing
(b) starved of mutation
(c) different in structure
(d) undergoing rapid division

Question. Opium is obtained from
(a) Papaver somniferum
(b) Rauwolfia serpentina
(c) Cannabis sativus
(d) Claviceps purpurea

Question. From which part of Atropa belladonna is the drug’belladona’ obtained?
(a) Stems
(b) Flowers
(c) Leaves
(d) Dried leaves and roots

Question. Hormone produced against allergic reaction is
(a) epinephrine
(b) nor-epinephrine
(c) glucocorticoid
(d) mineralocorticocoid

Question. Narcotic drugs like charas, bhang and ganja are extracted from
(a) hemp plant
(b) coco plant
(c) poppy seeds
(d) hallucinogen

Question. Techniques like radiography (use of X-rays), CT scanning nd MRI are very useful to detect
(a) autoimmune disorders.
(b) disease caused by viral infection.
(c) disease caused by bacterial infection.
(d) disease caused by an uncontrolled division of abnormal cells of internal organs.

Question. Hashish and charas are obtained from
(a) Rauwolfia serpentina
(b) Cannabis sativus
(c) Papaver somniferum
(d) Claviceps purpurea

Question. Opium is obtained from which part of the plant Papaver somniferum ?
(a) Inflorescence
(b) Male part (dried)
(c) Seed (unripe)
(d) Leave

Question. Atropine, an alkaloid, is obtained from
(a) Datura anaroxia
(b) Atropa belladonna
(c) Hyocyamus niger
(d) Withania somnifera 

Question. Vaccines produced through genetic engineering are considered safe because they
(a) are active form of antigens.
(b) are the least active forms.
(c) contain antibodies for coat proteins only.
(d) contain antibodies against whole antigen.

Question. Ergot, a drug is derived from fungus
(a) Aspergillus
(b) Phytopthora
(c) Clavicep
(d) Perenospora

Question. A certain patient is suspected to be suffering from acquired immuno deficiency syndrome. Which diagnostic technique will you recommend for its detection?
(a) WIDAL
(b) ELISA
(c) MRI
(d) Ultrasound

Question. Cirrhosis of the liver is caused by
(a) cocaine
(b) LSD
(c) alcohol
(d) morphine

Question. Common cold differs from pneumonia because
(a) pneumonia is a communicable disease, whereas the common cold is a nutritional deficiency disease
(b) pneumonia can be prevented by a live attenuated bacterial vaccine, whereas the common cold has no effective vaccine
(c) pneumonia is caused by a virus, while the common cold is caused by the bacterium, Haemophilus influenzae
(d) pneumonia pathogen infects alveoli, whereas the common cold affects nose and respiratory passage but not the lungs

Question. Consider the following statements.
I. IgE antibodies are produced in an allergic reaction.
II. B-lymphocytes mediate cell-mediated immunity.
III. The yellowish fluid colostrum has abundant IgE antibodies.
IV. Spleen is a secondary lymphoid organ.
Choose the correct option.
(a) Only I is correct
(b) I and II are correct
(c) II and III are correct
(d) I and IV are correct

Question. Where will you look for the sporozoites of the malarial parasite?
(a) RBCs of humans suffering from malaria
(b) Spleen of infected person
(c) Salivary glands of freshly moulted female Anopheles mosquito
(d) Saliva of infected female Anopheles mosquito

Question. Vaccination protects a person from disease because it
(a) helps in better digestion
(b) increases RBC count
(c) stimulates production of antibodies
(d) improves healing system

Question. …………… is a complete state of physical, mental and social well-being of a person.
(a) Disease
(b) Health
(c) Infection
(d) Nutrition

Question. Which one of the following disease is spread by housefly?
(a) Dengue
(b) Filariasis
(c) Amoebiasis
(d) Ascariasis

Question. Smoking addiction is harmful because smoke produces polycyclic aromatic hydrocarbons, which cause
(a) reduction in oxygen transport
(b) increase in blood pressure
(c) cancer
(d) retardation of growth of foetus

Question. The group of diseases carried (transmitted) by insects are
(a) typhoid, jaundice, tuberculosis
(b) mumps, measles, smallpox
(c) scabies, ringworm, swine flu
(d) malaria, filaria, yellow fever

Question. Disease which can easily transmit from one person to another is called
(a) non-infectious disease
(b) infectious disease
(c) viral disease
(d) congenital disease

Question. The following table shows certain diseases, their causative organisms and symptoms.
(image) 11
The correct option regarding A, B, C and D is
(a) A–Wuchereria, B–Salmonella typhi, C–Common cold, D–Internal bleeding, fever, anaemia
(b) A–Salmonella typhi, B–Ascaris, C–Typhoid, D–Stomach pain, headache
(c) A–Ascaris, B–Entamoeba histolytica, C–Pneumonia, D–Constipation, fever
(d) A–Entamoeba histolytica, B–Salmonella typhi, C–Common cold, D–Nasal discharge, high fever

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

Question. Choose the correct option regarding a antibody.
(a) IgA–Helps in allergic reaction
(b) IgG–Cross placenta
(c) IgE–Found in secretions
(d) IgM–Exists as dimer

Question. Match the following columns.
(image) 11
Codes
(a) A – 1, B – 2, C – 3
(b) A – 3, B – 2, C – 1
(c) A – 3, B – 1, C – 2
(d) A – 1, B – 3, C – 2

Question. Opioids are drugs that bind to specific opioid receptors present in our
(a) central nervous system
(b) urinogenital system
(c) gastrointestinal tract
(d) Both (a) and (c)

Question. Active immunity development is related to
(a) natural killer cells
(b) memory cells
(c) helper T-cells
(d) suppressor T-cells

We hope the above multiple choice questions for Class 12 Biology for Chapter 8 Human Health and Diseases provided above with answers based on the latest syllabus and examination guidelines issued by CBSE, NCERT and KVS are really useful for you. Human Health and Diseases is an important chapter in Class 12 as it provides very strong understanding about this topic. Students should go through the answers provided for the MCQs after they have themselves solved the questions. All MCQs have been provided with four options for the students to solve. These questions are really useful for benefit of class 12 students. Please go through these and let us know if you have any feedback in the comments section.