CBSE Class 12 Biology Human Health and Disease MCQs

Question: The term 'Health' is defined in many ways. The most accurate definition of the health would be

a) health is a state of complete physical, mental and social well-being

b) health is the symbol of economic prosperity

c) health is the reflection of a smiling face

d) health is the state of body and mind in a balanced condition

Answer :  A

Question: The organisms which cause diseases in plants and animals are called

a) Pathogens

b) Vectors

c) Insects

d) Worms

Answer :  A

Question: The chemical test that is used for diagnosis of typhoid is:

a) Widal-Test

b) PCR - Test

c) ESR - Test

d) ELISA-Test

Answer :  A

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) ii and iv

b) iii and iv

c) ii and iii

d) i and ii

Answer :  A

Question: The sporozoites that cause infection when a female Anopheles mosquito bites a human being are formed in

a) salivary glands of mosquito

b) intestine of human

c) RBCs of mosquito

d) Liver of human

Answer :  A

Question: The disease chikunguniya is transmitted by

a) Aedes mosquitoes

b) cockroach

c) female Anopheles

d) house flies

Answer :  A

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, sorethroat, headache

d) High fever, weakness, stomach pain, loss of appetite and constipation

Answer :  A

Question: The genes causing cancer are

a) oncogenes

b) regulatory genes

c) expressor genes

d) structural genes

Answer :  A

Question: The _________ is at its largest in children, but with the onset of puberty, it eventually shrinks and gets replaced by fat.

a) Thymus

b) Hypothalamus

c) None of these

d) Parathyroid gland

Answer :  A

Question: Ascaris lumbricoides is a species of parasitic roundworm that lives in

a) Humans

b) Grasshoppers

c) Pigs

d) None of the above

Answer :  A

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) metastasis

b) teratogenesis

c) mitosis

d) metagenesis

Answer :  A

Question: When an apparently healthy person is diagnosed as unhealthy by a psychiatrist, the reason could be that:

a) the patient shows behavioural and social maladjustment

b) he does not take interest in sports

c) the patient was not economically prosperous

d) the patient was not efficient at his work

Answer :  A

Question: Which of the following are the reason(s) for Rheumatoid arthritis? Choose the correct option

i. Lymphocytes become more active

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) ii and iv

b) iii and iv

c) i and iii

d) i and ii

Answer :  A

Question: AIDS is caused by HIV. Among the following, which one is not a mode of transmission of HIV?

a) Shaking hands with infected persons

b) Sexual contact with infected persons

c) Transfusion of contaminated blood

d) Sharing the infected needles

Answer :  A

Question: 'Smack' is a drug obtained from the:

a) latex of Papaver somniferum

b) leaves of Cannabis sativa

c) flowers of Dhatura

d) fruits of Erythroxyl coca

Answer :  A

Question: The substance produced by a cell in viral infection that can protect other cells from further infection is:

a) interferon

b) histamine

c) colostrum

d) serotonin

Answer :  A

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) cell-mediated immune response

b) physiological immune response

c) humoral immune response

d) auto-immune response

Answer :  A

Question: Antibodies present in colostrum which protect the new born from certain diseases is of

a) Ig A type

b) Ig G type

c) Ig D type

d) Ig E type

Answer :  A

Question: The immune system comprises

a) Humoral and Cell-mediated systems

b) Humoral and fibrous systems

c) Antigens

d) Lymphocytes

Answer :  A

Question: Which of the following is a viral disease?

a) Influenza

b) Diphtheria

c) Leprosy

d) Filariasis

Answer :  A

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) Curaimin

d) Catechin

Answer :  A

Question: Anti venom against snake poison contains

a) Antibodies

b) Antigen-antibody complexes

c) Antigens

d) Enzymes

Answer :  A

Question: Which of the following is not a lymphoid tissue?

a) Appendix

b) Thymus

c) Spleen

d) Tonsils

Answer :  A

Question: Which of the following glands is large sized at birth but reducies in size with aging?

a) Thymus

b) Pituitary

c) Pineal

d) Thyroid

Answer :  A

Question: Haemozoin is:

a) a toxin from Plasmodium species

b) a toxin from Haemophilus species

c) a toxin from Streptococcus

d) a precursor of hemoglobin

Answer :  A

Question: One of the following is not the causal organism for ringworm

a) Macrosporum

b) Epidermophyton

c) Trichophyton

d) Microsporum

Answer :  A

Question: A person with sickle cell anemia is

a) less prone to malaria

b) less prone to typhoid

c) more prone to typhoid

d) more prone to malaria

Answer :  A

Question: Plague is caused by the bacterium

a) Yersinia pestis

b) Yersinia pseudotuberculosis

c) Yersinia enterocolitica

d) None of these

Answer :  A

Question: Elephantiasis is caused by

a) Filarial worms

b) Flatworms

c) Tapeworms

d) None of these

Answer :  A

Question: ___________ is an example of a stimulant

a) Amphetamine

b) Lorazepam

c) Oxazepam

d) Phencyclidine

Answer :  A

Assertion and Reason Based MCQs

Directions : In the following questions a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as :
(A) Both assertion (A) and reason (R) are true and reason (R) is the correct explanation of assertion (A).
(B) Both assertion (A) and reason (R) are true but reason (R) is not the correct explanation of assertion (A).
(C) Assertion (A) is true but reason (R) is false.
(D) Assertion (A) is false but reason (R) is true.

Question: Assertion (A) : Sharing of injection needles between two individuals is not recommended.
Reason (R) : This transmits STDs like AIDS and Hepatitis from the diseased person to the healthy person.
Answer : A

Question: Assertion (A) : Bone marrow and thymus are primary lymphoid organs.
Reason(R) : It is the organs, to which matured lymphocytes migrate, interact with antigens and then proliferate to become effector cells.
Answer : C

Question: Assertion (A) : Pathogens are disease causing organisms.
Reason (R) : Salmonella typhi is a pathogenic virus causing tuberculosis.
Answer : C

Question: Assertion (A) : Cocaine are drug of abuse.
Reason (R) : Cocaine interferes in the working of central nervous system.
Answer : C

Question: Assertion(A) : The colostrum provides passive immunity to the newborn baby.
Reason(R) : In this, the readymade antibodies are directly given to protect the body.
Answer : A

Question: Assertion (A) : Heroin, the smack is chemically diacetylmorphine.
Reason (R) : Heroin is obtained by acetylation of morphine.
Answer : A

Question: Assertion (A) : Acquired immunity is pathogen specific.
Reason (R) : It is not present since birth.
Answer : A

Question: Assertion (A) : Opioids, also called opiates used to treat pain.
Reason (R) : Opioids are the drugs which bind to specific opioid receptors present in our central nervous system.
Answer : A

Question: Assertion (A) : Ganja is obtained from Cannabis sativa / hemp plant.
Reason (R) : It is hallucinogenic, alters perception, causes illusion and damages cardiovascular system.
Answer : A

Question: Assertion (A) : Smoking increases the carbon monoxide (CO) content in the blood which has greater affinity to haemoglobin than oxygen.
Reason (R) : CO forms a stable bond with haemoglobin and does not allow binding of oxygen. It reduces concentration of haem bounded oxygen and causes oxygen deficiency in the body.
Answer : A