Ultimate Communicable Disease MCQs Class 12 Biology – Master Exam Success Fast

Ultimate Communicable Disease MCQs Class 12 Biology – Master Exam Success Fast

Communicable Disease MCQs Class 12 Biology is a valuable revision topic for aspirants who want to understand human health and disease with clarity, confidence, and exam focus. Communicable Disease MCQs Class 12 Biology helps aspirants review how infectious diseases spread through air, water, food, vectors, direct contact, contaminated objects, and unsafe surroundings. In Class 12 Biology, communicable diseases form an important part of the human health and disease chapter because they explain the relationship between pathogens, hosts, immunity, symptoms, diagnosis, treatment, and prevention. Communicable Disease MCQs Class 12 Biology is useful for board exam preparation as well as NEET-style revision because it encourages aspirants to connect facts with concepts rather than memorising disease names blindly.

Communicable Disease MCQs Class 12 Biology covers diseases caused by bacteria, viruses, protozoans, fungi, and helminths. Aspirants should know that typhoid is caused by Salmonella typhi, pneumonia may be caused by Streptococcus pneumoniae, cholera is caused by Vibrio cholerae, and tuberculosis is caused by Mycobacterium tuberculosis. Communicable Disease MCQs Class 12 Biology also includes viral diseases such as influenza, measles, dengue, hepatitis, AIDS, and COVID-like respiratory infections, where understanding transmission is as important as remembering the causative agent. Protozoan diseases like malaria and amoebiasis are also essential because they involve vectors, contaminated food, or unsafe water. Communicable Disease MCQs Class 12 Biology therefore trains aspirants to recognise disease patterns, identify organisms, and understand why prevention methods work.

Aspirants preparing Communicable Disease MCQs Class 12 Biology should focus strongly on modes of transmission. Airborne diseases spread through droplets released during coughing, sneezing, or talking. Waterborne diseases spread through unsafe drinking water and poor sanitation. Vector-borne diseases are transmitted by organisms such as mosquitoes, sandflies, houseflies, and ticks. Communicable Disease MCQs Class 12 Biology becomes easier when aspirants learn examples in groups, such as malaria through female Anopheles mosquito, dengue through Aedes mosquito, kala-azar through sandfly, and filariasis through Culex mosquito. This grouped approach improves memory and reduces confusion during exams.

Communicable Disease MCQs Class 12 Biology also requires a good understanding of immunity. The human body protects itself through physical barriers, white blood cells, antibodies, antigens, interferons, inflammation, and memory cells. Vaccination is one of the most important preventive tools because it prepares the immune system to respond quickly when the real pathogen enters the body. Communicable Disease MCQs Class 12 Biology helps aspirants understand why vaccines are used for diseases such as polio, diphtheria, tetanus, pertussis, measles, hepatitis B, and tuberculosis. Aspirants should also remember that antibiotics act mainly against bacterial infections and are not effective against viral diseases, which is a common point of confusion.

A short and focused revision method can make Communicable Disease MCQs Class 12 Biology much easier. Aspirants can prepare charts with four columns: disease, pathogen, transmission, and prevention. Communicable Disease MCQs Class 12 Biology becomes more practical when aspirants connect textbook facts with real-life public health measures such as handwashing, safe drinking water, vaccination, mosquito control, proper waste disposal, early diagnosis, and responsible medical care. Regular revision also helps aspirants distinguish communicable diseases from non-communicable diseases such as diabetes, hypertension, cancer, and genetic disorders.

Communicable Disease MCQs Class 12 Biology is especially useful for quick exam revision because many questions are based on matching diseases with pathogens, identifying vectors, selecting correct symptoms, and understanding preventive strategies. Aspirants should pay attention to symptoms such as fever, chills, diarrhoea, cough, fatigue, skin rashes, anaemia, swelling, and weakness because symptoms often provide clues about the disease. Communicable Disease MCQs Class 12 Biology also highlights the importance of early treatment, since untreated infectious diseases can spread quickly in families, communities, hostels, workplaces, and public places.

Another important part of Communicable Disease MCQs Class 12 Biology is the study of sexually transmitted diseases, including syphilis, gonorrhoea, AIDS, and hepatitis B. Aspirants should study this area scientifically and responsibly, focusing on causative agents, transmission routes, symptoms, prevention, and awareness. Communicable Disease MCQs Class 12 Biology also teaches that prevention depends on breaking the chain of infection. This means controlling the source of infection, blocking transmission, protecting susceptible individuals, and improving hygiene, nutrition, and immunity.

Communicable Disease MCQs Class 12 Biology:

  1. Which one of the following correctly matches a Sexually Transmitted Disease (STD) with its pathogen?

A. AIDS – Bacillus anthracis
B. Syphilis – Treponema pallidum
C. Urethritis – Entamoeba gingivalis
D. Gonorrhoea – Leishmania donovani

Answer: B. Syphilis – Treponema pallidum

Explanation: The correctly matched pair is Syphilis – Treponema pallidum. Syphilis is caused by the bacterial pathogen Treponema pallidum.

  1. Critical state of disease is called

A. Acme
B. Acromion
C. Acholin
D. None of these

Answer: A. Acme

Explanation: Critical state of disease is called acme.

  1. Cholera, leprosy, and diphtheria are:

A. Bacterial diseases
B. Viral diseases
C. Fungal diseases
D. Functional diseases

Answer: A. Bacterial diseases

Explanation: Cholera, leprosy, and diphtheria are bacterial diseases. Cholera is caused by Vibrio cholerae, leprosy by Mycobacterium leprae, and diphtheria by Corynebacterium diphtheriae.

  1. What is the scientific name of pinworm of man?

A. Trichinella spiralis
B. Dracunculus medinensis
C. Trichuris trichiura
D. Enterobius vermicularis

Answer: D. Enterobius vermicularis

Explanation: Pinworm infection in humans is caused by Enterobius vermicularis, a small white roundworm.

  1. DPT vaccines are given for:

A. Tetanus, polio, plague
B. Diphtheria, whooping cough, and leprosy
C. Diphtheria, pneumonia, tetanus
D. Diphtheria, whooping cough, tetanus

Answer: D. Diphtheria, whooping cough, tetanus

Explanation: DPT vaccine protects against diphtheria, pertussis or whooping cough, and tetanus.

  1. Achondroplasia is a disease related to the defect in the formation of

A. Membrane
B. Mucosa
C. Bone
D. Cartilage

Answer: D. Cartilage

Explanation: Achondroplasia is a genetic disorder related to abnormal cartilage formation, which affects normal bone growth and leads to dwarfism.

  1. Which of the following causes disease in human beings?

A. Rhizopus
B. Puccinia
C. Aspergillus
D. Cystopus

Answer: C. Aspergillus

Explanation: Aspergillus can cause respiratory allergies and infections in humans. The disease caused by Aspergillus is called aspergillosis.

  1. Find the incorrect match of the disease and their causative agent.

A. Typhoid – Salmonella typhi
B. Pneumonia – Streptococcus pneumoniae
C. Syphilis – Bordetella pertussis
D. Gonorrhea – Neisseria gonorrhoeae

Answer: C. Syphilis – Bordetella pertussis

Explanation: Syphilis is caused by Treponema pallidum, while Bordetella pertussis causes whooping cough.

  1. Congenital diseases are:

A. Deficiency diseases
B. Diseases present at birth
C. Spread from one individual to another
D. Occur during life

Answer: B. Diseases present at birth

Explanation: Congenital diseases are diseases or disorders that are present at birth.

  1. What is a congenital disease?

A. A disease caused by a virus
B. A condition existing at birth or developing during the first month of life
C. A disease transmitted by a vector
D. A disease caused by a bacterium

Answer: B. A condition existing at birth or developing during the first month of life

Explanation: A congenital disease is a condition that is present at birth or develops during the first month of life.

  1. What is the bacterium Bdellovibrio bacteriovorus classified as?

A. Autotroph
B. Parasite
C. Saprophyte
D. Symbiont

Answer: B. Parasite

Explanation: Bdellovibrio bacteriovorus is classified as a parasite because it attacks and lives on other bacteria.

  1. What is the organism called that carries a disease from one organism to another?

A. Parasite
B. Host
C. Vector
D. None of these

Answer: C. Vector

Explanation: An organism that carries and transmits disease from one organism to another is called a vector.

  1. If a person shows production of interferons in his body, what infection is likely present?

A. Typhoid
B. Measles
C. Tetanus
D. Malaria

Answer: B. Measles

Explanation: Interferons are produced by the body mainly in response to viral infections. Measles is a viral disease.

  1. Which of the following is a communicable disease?

A. Influenza
B. Diabetes
C. Hypertension
D. Kwashiorkor

Answer: A. Influenza

Explanation: Influenza is a communicable disease caused by influenza viruses and spreads from person to person.

  1. The interval between infection and appearance of disease is known as

A. Incubation period
B. Inoculation
C. Penetration
D. Infection period

Answer: A. Incubation period

Explanation: The time interval between infection and the appearance of disease symptoms is called the incubation period.

  1. Amoebiasis in human is acquired through

A. Viral infection
B. Contamination of food with cysts
C. Accidental consumption of amoebic trophozoites
D. None of the above

Answer: B. Contamination of food with cysts

Explanation: Amoebiasis is acquired by consuming food or water contaminated with cysts of Entamoeba histolytica.

  1. Marasmus in children is caused by deficiency of

A. Protein
B. Fats
C. Vitamins
D. Carbohydrates

Answer: A. Protein

Explanation: Marasmus is caused by severe deficiency of proteins and calories, leading to wasting of muscles and body fat.

  1. Christmas disease is another name for

A. Down’s syndrome
B. Sleeping sickness
C. Haemophilia-B
D. Hepatitis-B

Answer: C. Haemophilia-B

Explanation: Christmas disease is another name for Haemophilia B, a hereditary bleeding disorder caused by deficiency of clotting factor IX.

  1. Pullorum disease of poultry is caused by

A. Mycobacterium
B. Salmonella
C. Clostridium
D. Haemophilus

Answer: B. Salmonella

Explanation: Pullorum disease of poultry is caused by Salmonella. It is common in young chickens and turkeys.

  1. The chief advantage of encystment of an Amoeba is

A. Protection from parasites and predators
B. The chance to get rid of accumulated waste products
C. The ability to survive during adverse physical conditions
D. The ability to live for some time without ingesting food

Answer: C. The ability to survive during adverse physical conditions

Explanation: Encystment helps Amoeba survive during unfavourable environmental conditions by forming a protective cyst.

  1. Kala-azar disease is transmitted by

A. Tabinus
B. Solomax
C. Glossina
D. Phlebotomus

Answer: D. Phlebotomus

Explanation: Kala-azar, also known as visceral leishmaniasis, is transmitted by the bite of infected Phlebotomus sandflies.

  1. Which of the following is correct pair of disease and its causing agent?

A. Soft sore – Bacillus brevis
B. Gonorrhoea – Entamoeba
C. Syphilis – Treponema pallidum
D. Urethritis – Bacillus anthracis

Answer: C. Syphilis – Treponema pallidum

Explanation: Syphilis is caused by the bacterium Treponema pallidum.

  1. Pebrine is a disease of

A. Fish
B. Honey bee
C. Silk worm
D. Lac insect

Answer: C. Silk worm

Explanation: Pebrine is a disease of silkworm caused by Nosema bombycis.

  1. Diabetes mellitus is due to lack of:

A. Starch in blood
B. Trypsin in pancreatic juice
C. ADH reaching in kidneys
D. Insulin in blood

Answer: D. Insulin in blood

Explanation: Diabetes mellitus occurs due to lack of insulin production or ineffective use of insulin by the body.

  1. Black water fever is caused by

A. Plasmodium malariae
B. P. ovale
C. P. falciparum
D. P. vivax

Answer: C. P. falciparum

Explanation: Black water fever is a severe complication of malaria caused mainly by Plasmodium falciparum.

  1. Disorders like alkaptonuria and phenylketonuria are referred to as

A. Acquired disease
B. Communicable disease
C. Congenital disease
D. Non-communicable disease

Answer: C. Congenital disease

Explanation: Alkaptonuria and phenylketonuria are congenital disorders and are known as inborn errors of metabolism.

  1. A microbial disease that spreads over a very large geographic area is called:

A. A pandemic
B. An outbreak
C. An epidemic
D. A chronic disease

Answer: A. A pandemic

Explanation: A disease that spreads over a very large geographic area, such as many countries or the whole world, is called a pandemic.

  1. Cri-du-chat syndrome in humans is caused by

A. Fertilization of an XX egg by a normal Y-bearing sperm
B. Loss of half of the short arm of chromosome 5
C. Loss of half of the long arm of chromosome 5
D. Trisomy of 21st chromosome

Answer: B. Loss of half of the short arm of chromosome 5

Explanation: Cri-du-chat syndrome is caused by deletion of part of the short arm of chromosome 5.

  1. G-6-P dehydrogenase deficiency is associated with haemolysis of

A. Leucocytes
B. Lymphocytes
C. Platelets
D. RBCs

Answer: D. RBCs

Explanation: G-6-P dehydrogenase deficiency causes haemolysis of red blood cells, resulting in haemolytic anemia.

  1. Match the common names of diseases with their medical terms:

A. A = s, B = q, C = p, D = r
B. A = r, B = s, C = q, D = p
C. A = q, B = s, C = r, D = p
D. A = s, B = p, C = r, D = q

Answer: A. A = s, B = q, C = p, D = r

Explanation: Blood clotting in small capillaries is matched with coronary thrombosis, valve defects with stenosis, hay fever with rhinitis, and paralysis with Parkinson’s disease.

Communicable disease mcqs class 12 biology

 

Conclusion on Communicable Disease MCQs Class 12 Biology

In conclusion, Communicable Disease MCQs Class 12 Biology is an essential topic for aspirants who want strong preparation in human health and disease. It improves understanding of pathogens, vectors, immunity, symptoms, prevention, vaccination, and treatment. Communicable Disease MCQs Class 12 Biology also builds awareness about personal hygiene and public health, making it useful beyond examinations. With consistent revision of Communicable Disease MCQs Class 12 Biology , aspirants can answer disease-based questions with better speed and accuracy. Overall, Communicable Disease MCQs Class 12 Biology gives aspirants a clear, organised, and exam-friendly way to master communicable diseases while developing practical health awareness.

 

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