Class 12 Biology MCQ Chapter 8 Human Health and Disease
Are you searching for Class 12 Biology MCQ Chapter 8 Human Health and Disease English Medium? Then you have come to the right place. This article provides important multiple-choice questions (MCQs) with answers from Chapter 8: Human Health and Disease for AHSEC Higher Secondary students.
This chapter helps students understand the concepts of health, diseases, immunity, and the body’s defense system. It covers important topics such as pathogens, infectious diseases, immunity, vaccination, allergies, AIDS, cancer, drug abuse, and the prevention and control of diseases. These topics are important for both board examinations and general awareness about human health.
All MCQs are prepared according to the latest AHSEC syllabus and examination pattern. Regular practice of these objective questions will help students revise important concepts, improve their understanding of the chapter, and perform better in examinations.
Whether you are preparing for class tests, model examinations, or the AHSEC Higher Secondary Final Examination, these MCQ solutions will help you strengthen your preparation and score higher marks in Biology.
Unit VIII: Biology in Human Welfare
Human Health and Disease
VSA & MCQ
I. Very Short Question-Answers
Q. What is health?
Ans: Health is a state of complete physical, mental and social well-being.
Q. What is disease?
Ans: Disease is a condition that disturbs normal functioning of the body.
Q. What are pathogens?
Ans: Pathogens are disease-causing organisms.
Q. Name the causative agent of malaria.
Ans: Plasmodium.
Q. Which mosquito transmits malaria?
Ans: Female Anopheles mosquito.
Q. What is the infective stage of Plasmodium for humans?
Ans: Sporozoite.
Q. Name the causative agent of typhoid.
Ans: Salmonella typhi.
Q. What is the full form of AIDS?
Ans: Acquired Immuno Deficiency Syndrome.
Q. Which virus causes AIDS?
Ans: Human Immunodeficiency Virus (HIV).
Q. Which cells are mainly attacked by HIV?
Ans: Helper T-lymphocytes.
Q. What is immunity?
Ans: Immunity is the ability of the body to resist diseases.
Q. What is innate immunity?
Ans: Innate immunity is the natural inborn defense mechanism of the body.
Q. What is acquired immunity?
Ans: Acquired immunity develops after exposure to pathogens.
Q. What are antibodies?
Ans: Antibodies are proteins produced in response to antigens.
Q. What is vaccination?
Ans: Vaccination is the administration of vaccines to develop immunity.
Q. What is allergy?
Ans: Allergy is hypersensitivity of the immune system to certain substances.
Q. Name the chemical released during allergic reactions.
Ans: Histamine.
Q. What is cancer?
Ans: Cancer is uncontrolled growth of abnormal cells.
Q. What are carcinogens?
Ans: Carcinogens are cancer-causing agents.
Q. What is metastasis?
Ans: Metastasis is the spread of cancer cells to other parts of the body.
Q. What are oncogenes?
Ans: Oncogenes are genes involved in development of cancer.
Q. What is chemotherapy?
Ans: Chemotherapy is treatment of cancer using chemicals or drugs.
Q. What is drug addiction?
Ans: Drug addiction is dependence on harmful drugs.
Q. Name one hallucinogenic drug.
Ans: LSD.
Q. What is alcoholism?
Ans: Alcoholism is addiction to alcoholic drinks.
Q. What are opioids?
Ans: Opioids are drugs obtained from opium poppy.
Q. Name one communicable disease.
Ans: Tuberculosis.
Q. What is an antigen?
Ans: An antigen is a substance that stimulates immune response.
Q. What is immunization?
Ans: Immunization is the process of developing immunity against diseases.
Q. Name one bacterial disease in humans.
Ans: Pneumonia.
II. Multiple Choice Questions (MCQs)
Q. Health means:
(a) Absence of disease only
(b) Physical fitness only
(c) Complete well-being
(d) Mental fitness only
Ans: (c) Complete well-being
Q. Malaria is caused by:
(a) Virus
(b) Bacteria
(c) Protozoan
(d) Fungus
Ans: (c) Protozoan
Q. The vector of malaria is:
(a) Male Anopheles
(b) Female Anopheles
(c) Culex mosquito
(d) Aedes mosquito
Ans: (b) Female Anopheles
Q. Typhoid is caused by:
(a) Vibrio cholerae
(b) Salmonella typhi
(c) Plasmodium
(d) HIV
Ans: (b) Salmonella typhi
Q. AIDS is caused by:
(a) HBV
(b) HCV
(c) HIV
(d) TMV
Ans: (c) HIV
Q. HIV attacks mainly:
(a) RBCs
(b) Platelets
(c) Helper T-cells
(d) Neurons
Ans: (c) Helper T-cells
Q. Immunity developed after vaccination is:
(a) Innate immunity
(b) Acquired immunity
(c) Passive immunity
(d) Genetic immunity
Ans: (b) Acquired immunity
Q. Antibodies are produced by:
(a) RBCs
(b) WBCs
(c) Platelets
(d) Plasma only
Ans: (b) WBCs
Q. Histamine is associated with:
(a) Digestion
(b) Respiration
(c) Allergy
(d) Blood clotting
Ans: (c) Allergy
Q. Cancer is characterized by:
(a) Controlled cell division
(b) Lack of growth
(c) Uncontrolled cell division
(d) Destruction of RBCs
Ans: (c) Uncontrolled cell division
Q. Spread of cancer cells to other body parts is:
(a) Mutation
(b) Metastasis
(c) Allergy
(d) Immunity
Ans: (b) Metastasis
Q. Cancer-causing agents are called:
(a) Antigens
(b) Allergens
(c) Carcinogens
(d) Antibodies
Ans: (c) Carcinogens
Q. Tobacco smoking may cause:
(a) Diabetes
(b) Cancer
(c) Malaria
(d) Typhoid
Ans: (b) Cancer
Q. Treatment of cancer using chemicals is:
(a) Immunotherapy
(b) Surgery
(c) Chemotherapy
(d) Vaccination
Ans: (c) Chemotherapy
Q. Which one is a communicable disease?
(a) Diabetes
(b) Hypertension
(c) Tuberculosis
(d) Cancer
Ans: (c) Tuberculosis
Q. Opioids are obtained from:
(a) Cannabis
(b) Coca plant
(c) Opium poppy
(d) Tobacco plant
Ans: (c) Opium poppy
Q. LSD is a:
(a) Stimulant
(b) Hallucinogen
(c) Antibiotic
(d) Sedative
Ans: (b) Hallucinogen
Q. Addiction to alcohol is called:
(a) Smoking
(b) Allergy
(c) Alcoholism
(d) Immunity
Ans: (c) Alcoholism
Q. The first line of body defense is:
(a) Antibodies
(b) Skin
(c) Blood
(d) Lymph
Ans: (b) Skin
Q. Vaccines help in:
(a) Digestion
(b) Respiration
(c) Immunization
(d) Blood clotting
Ans: (c) Immunization
Q. The causative organism of pneumonia is:
(a) Plasmodium
(b) Streptococcus pneumoniae
(c) HIV
(d) Entamoeba
Ans: (b) Streptococcus pneumoniae
Q. Antigens stimulate production of:
(a) Hormones
(b) Enzymes
(c) Antibodies
(d) Vitamins
Ans: (c) Antibodies
Q. Innate immunity is:
(a) Acquired after birth
(b) Present from birth
(c) Artificial immunity
(d) Vaccine-induced immunity
Ans: (b) Present from birth
Q. Which one is a viral disease?
(a) Malaria
(b) Typhoid
(c) AIDS
(d) Tuberculosis
Ans: (c) AIDS
Q. The infective stage of Plasmodium is:
(a) Merozoite
(b) Gametocyte
(c) Sporozoite
(d) Trophozoite
Ans: (c) Sporozoite
Q. Which blood cells help in immunity?
(a) RBCs
(b) WBCs
(c) Platelets
(d) Osteocytes
Ans: (b) WBCs
Q. Allergy is caused due to:
(a) Hypersensitivity
(b) Deficiency of vitamins
(c) Lack of oxygen
(d) Excess glucose
Ans: (a) Hypersensitivity
Q. Which one is not a communicable disease?
(a) AIDS
(b) Malaria
(c) Cancer
(d) Typhoid
Ans: (c) Cancer
Q. The study of immune system is called:
(a) Pathology
(b) Immunology
(c) Genetics
(d) Oncology
Ans: (b) Immunology
Q. Which of the following helps prevent diseases?
(a) Vaccination
(b) Smoking
(c) Drug abuse
(d) Alcoholism
Ans: (a) Vaccination
Q. Assertion (A): AIDS weakens the immune system.
Reason (R): HIV attacks helper T-lymphocytes.
(a) Both A and R are true, and R is the correct explanation of A.
(b) Both A and R are true, but R is not the correct explanation of A.
(c) A is true, but R is false.
(d) A is false, but R is true.
Ans: (b)
Q. Assertion (A): Female Anopheles mosquito transmits malaria.
Reason (R): Plasmodium completes part of its life cycle in mosquito.
(a) Both A and R are true, and R is the correct explanation of A.
(b) Both A and R are true, but R is not the correct explanation of A.
(c) A is true, but R is false.
(d) A is false, but R is true.
Ans: (a)
Q. Assertion (A): Vaccination provides immunity against diseases.
Reason (R): Vaccines stimulate antibody production in the body.
(a) Both A and R are true, and R is the correct explanation of A.
(b) Both A and R are true, but R is not the correct explanation of A.
(c) A is true, but R is false.
(d) A is false, but R is true.
Ans: (b)
Q. Assertion (A): Histamine is released during allergic reactions.
Reason (R): Allergy is due to hypersensitivity of immune system.
(a) Both A and R are true, and R is the correct explanation of A.
(b) Both A and R are true, but R is not the correct explanation of A.
(c) A is true, but R is false.
(d) A is false, but R is true.
Ans: (c)
Q. Assertion (A): Cancer involves uncontrolled cell division.
Reason (R): Metastasis is the spread of cancer cells to different body parts.
(a) Both A and R are true, and R is the correct explanation of A.
(b) Both A and R are true, but R is not the correct explanation of A.
(c) A is true, but R is false.
(d) A is false, but R is true.
Ans: (b)
Q. Assertion (A): Drug addiction is harmful to physical and mental health.
Reason (R): Addictive drugs affect the nervous system.
(a) Both A and R are true, and R is the correct explanation of A.
(b) Both A and R are true, but R is not the correct explanation of A.
(c) A is true, but R is false.
(d) A is false, but R is true.
Ans: (a)
Q. Assertion (A): Innate immunity is acquired after vaccination.
Reason (R): Innate immunity is present from birth.
(a) Both A and R are true, and R is the correct explanation of A.
(b) Both A and R are true, but R is not the correct explanation of A.
(c) A is true, but R is false.
(d) A is false, but R is true.
Ans: (d)
