Human Health and Disease

CBSE Class 12 Biology · every board question from this chapter, 2022–2026

• Which of the following is a carrier for the disease Amoebiasis?2026
• Which of the following is not a component of immune system?2026
• Interferons are most effective in making non-infected cells resistant against the spread of which of the following diseases?2026
• Select the mismatched pair:2026
• Consider the following statements and choose the correct option: Statement I: Using vaccination and immunization programmes, we…2026
• Internal bleeding, muscular pain, blockage of the intestinal passage and anaemia are some of the symptoms caused due to infection…2026
• S is the stimulant of central nervous system and interferes with the transport of T, a neurotransmitter. Identify S and T and…2026
• A doctor identifies symptoms of nasal congestion, headache, sore throat, hoarseness and cough in a patient. The conclusion is…2026
• Nicotine affects blood pressure and heart rate due to release of certain adrenal hormones. Following are some of the adrenal…2026
• What is the role of histamine released by mast cells?2026
• Which cells are responsible for producing antibodies in a human body?2026
• Which of the following is not a symptom of Ascariasis?2026
• Antivenom injection is an example of2026
• Some statements regarding drugs and alcohol are given below: (i) Adolescents are more vulnerable to peer pressure. (ii) Drug…2026
• A health officer visiting two different regions reported the following symptoms in patients: Region A - Sustained high fever with…2026
• Define Humoral immune response. Name any two types of antibodies found to give humoral immune response in humans.2026
• State the role of thymus as a lymphoid organ. Name the cells that are released from it and mention their functions.2026
• A person complains of persistent itching in the groin region and scalp. The person also shows dry and scaly lesions on skin,…2026
• A patient reports a high fever, chills and sweating. His blood shows the presence of a toxic substance. (i) Identify the disease…2026
• Name the lymphoid organ that acts as a large reservoir of erythrocytes. Explain its role as a lymphoid organ.2026
• Differentiate between opioids and cannabinoids on the basis of their Receptor site in human body. Mode of action in human body.2026
• Mention the scientific name of the source plant and the part from which opioids are extracted. How are morphine and heroin…2026
• How do some viruses cause cancer in humans? How do benign tumours turn malignant? How do malignant tumours harm the human body?2026
• Study the following cases: Case I: A person bitten by a rabid dog is immediately given an injection of antitoxin for rabies. Case…2026
• A person inhales dust and pathogens but does not always fall sick. Explain how the body protects against such infections. Name…2026
• Name the cells of the human body attacked by HIV first, when it gains entry into a human body. How does this virus replicate…2026
• Read the following passage and answer the question that follow: The data below shows the concentration of nicotine smoked by a…2026
• Read the following passage and answer the questions that follow: Immunity in our body is of two types (i) Innate immunity, and…2026
• (i) Draw the structure of an antibody molecule and label any four of its parts. (ii) Differentiate between active and passive…2026
• A 30 year old man was admitted to a hospital with recurrent infections, weight loss, prolonged fever. His blood report showed a…2026
• The following information is about drugs and tobacco. Select the correct statement from the options given below.2025
• The type of antibodies produced during an immune response to allergens as dust and pollen grains in a person is:2025
• In which of the following human diseases does the body's self-defence mechanism attack self-cells?2025
• The lobed organ located near the heart and beneath the breast bone in humans is:2025
• Allergy in humans is a result of release of the following chemicals from the mast cells:2025
• Transplantation of tissues/organs to some patients often fails due to rejection of such tissues/organs by the body of the…2025
• Study the items of columns I and II where drugs and their effects are given and match them correctly. Choose the correct answer…2025
• Which one of the following immune system components does not correctly match with its respective role?2025
• The lymphoid organ located within the lining of respiratory, digestive and urinogenital tract is:2025
• The foetus receives some antibodies from their mother through the placenta during pregnancy. Choose the correct option that shows…2025
• Human Immunodeficiency Virus is a member of the group of viruses known as:2025
• The technique for the early detection of a disease based on the principle of antigen-antibody interaction is:2025
• A characteristic property that distinguishes a malignant tumor from a benign tumor is:2025
• Early detection of HIV in suspected AIDS patients can be done using the diagnostic technique of:2025
• The decrease in the T-Lymphocytes count in human blood will finally result in2025
• Out of the following, select the correct match:2025
• Assertion: An antibody is a protein molecule made by the lymphocytes. Reason (R): An antibody binds to a specific foreign antigen…2025
• Assertion: A person infected with malaria suffers from chill and high fever, recurring every three or four days. Reason (R): The…2025
• Assertion: Secondary immune response is quicker and stronger than the primary immune response. Reason (R): Our body appears to…2025
• Assertion: Streptococcus pneumoniae and Haemophilus influenzae are responsible for causing infectious disease in human beings.…2025
• Assertion: Lymphocytes arise from bone marrow and present in the blood and lymph and serve as natural killer cells. Reason (R):…2025
• Assertion: In humans, filariasis is characteried by inflammation in the lower limbs. Reason (R): Filarial worm usually lives in…2025
• Give an account of the generalised structure of an antibody molecule produced by B-lymphocytes in response to the pathogen. OR…2025
• Explain how the immunity of a person is affected if there is atrophy (degeneration) of the thymus gland at an early stage of…2025
• Student to attempt either option or. Describe any two situations where a medical doctor would recommend injection of a pre-formed…2025
• How does a human body respond when vaccine is introduced into it? It is said that vaccinations are a must for a healthy society.…2025
• Study a part of life cycle of Plasmodium given below: Answer the following questions: Name the infective stage of Plasmodium that…2025
• A person is suffering from high grade fever. Which symptoms will help to identify if he/she is suffering from Typhoid, Pneumonia…2025
• Samples of blood and urine of a sportsperson are collected before any sports event for drug tests. Why there is a need to conduct…2025
• Read the following passage and answer the questions that follow. Prevention is the frontline response to drug use. Effective…2025
• Immunity in our body is of two types: (i) Innate immunity and (ii) acquired immunity. Innate immunity is a non-specific defence…2025
• Read the following passage and answer the questions that follow. Deaths related to the use of drugs were estimated at about…2025
• In 2021, 5 · 3 percent of 15 to 16-year-olds worldwide ( 13 · 5 million individuals) had used Cannabis in the past year according…2025
• Read the following passage and answer the questions that follow. Prevention is the frontline response to drug use. Effective…2025
• Student to attempt either option- or: Answer the following questions: (i) State what do you understand by "MALT"? Where it is…2025
• Interferons are proteins secreted by2024
• Allergic reactions are countered by the administration of:2024
• During an allergic reaction, the binding of antigen to IgE antibodies initiates release of:2024
• In which of the following conditions/diseases is there a substantial increase in the activity of mast cells observed in the human…2024
• Lactobacillus that sets milk into curd is categorised as:2024
• The source of 'Smack' is:2024
• A patient is suffering from the infection of the alveoli of lungs and is showing the symptoms of fever, chills, cough, headache…2024
• The vector for dengue fever is:2024
• A patient is suffering from fever, chills, cough, headache and bluish finger nails and lips. These symptoms are of the disease:2024
• Which disease is the patient suffering from who is showing symptoms such as sustained high fever (39°C to 40°C), stomach pain,…2024
• Select the incorrect match from the following:2024
• Assertion: AIDS is a syndrome caused by HIV. Reason (R): HIV is a virus that damages the immune system with DNA as its genetic…2024
• Assertion: Virus-infected cells produce interferons. Reason (R): Interferons can cause inflammation of virus-infected cells.2024
• Assertion: The chronic use of alcohol by a person leads to cirrhosis. Reason (R): Alcohol addiction at times becomes the cause of…2024
• What is a vaccine? Write the basis on which it acts when administered in the body.2024
• Identify A, B, C and D in the following table:2024
• Mention any two ways by which HIV and Hepatitis-B can be transmitted to a healthy person. Why is an early detection of these…2024
• A farmer while working on his farm was bitten by a poisonous snake. He was rushed to a nearby health centre where the doctor gave…2024
• "Mother's milk is considered very essential for the new born infant." Justify. What is a 'vaccine'? Explain the principle on…2024
• (i) Name the group of drugs whose skeletal molecule is shown below: (ii) How are such drugs consumed? (iii) Name the human body…2024
• Differentiate between humoral immune response and cell-mediated immune response. Draw a schematic diagram of an antibody molecule…2024
• Identify A and B in the diagram below. Explain their role in the immune system of the body.2024
• Identify A, B, C, D, E and F in the table given below:2024
• The diagram given below is a biomolecule needed for sugar metabolism in human beings. Name this biomolecule and mention whether…2024
• Read the following passage and answer the questions that follow. In 1981, the health workers of United States of America had…2024
• Read the following passage and answer the questions that follow: "Mosquitoes are drastically affecting the human health in almost…2024
• (i) Describe the life cycle of Plasmodium from the time it enters the human body till a female Anopheles mosquito bites an…2024
• Describe the life cycle of HIV from the time of its entry into the human body till full blown AIDS sets in. OR (i) Write the…2024
• Interferons are proteins. In humans they are secreted by:2023
• The decrease in the T-lymphocytes count in human blood will result in: 12023
• Select the pathogen mismatched with the symptoms of disease caused by it from the list given below:2023
• Select the options which is/are incorrect statement(s) with respect to T-lymphocytes in the human body. (i) They are a type of…2023
• Tetanus antitoxin (Tetanus toxoid) when injected into the human body it immediately provides:2023
• Assertion: The Covid-19 virus has a shorter life-span and evolves into new strains at a fast speed. Reason (R): RNA being…2023
• Assertion: More and more children in metro cities of India suffer from allergies and asthma due to sensitivity to the…2023
• Assertion: Mary Mallon continued to spread typhoid for many years. Reason (R): Salmonella typhi generally enters the small…2023
• Why should antibiotics not be taken indiscriminately? Give any two reasons. "It is advisable to complete the course of…2023
• Name the category of drugs represented by the chemical structure given above. If the methyl group is substituted by acetyl group…2023
• Differentiate between malignant and benign tumours. Name and explain the most feared property of a malignant tumour.2023
• "Plasmodium protozoan needs both a mosquito and a human host for its continuity." Explain. OR We all must work towards…2023
• When a microorganism invades a host, a definite sequence of events usually occur leading to infection and disease, causing…2023
• The diagram shows the life cycle of a pathogenic protozoan. (i) Name the parasitic stage that is being transferred from host 'X'…2023
• A time-bound vaccination programme is followed for the children in our country from their birth up to ten years of age. A graph…2023
• Name the diseases and their mode of transmission in human by (i) common round worm and (ii) filarial worm.2022
• Explain, giving two reasons, how immune response by "vaccine" is different from that by "antitoxin" in humans.2022
• Though filariasis is not fatal, but the disease in humans is responsible for considerable suffering, gross deformities and…2022
• Mention the parts of human body that get affected by Pneumonia and common cold infections. Write the causative agents of the two…2022
• How does Human Immuno deficiency Virus cause immuno deficiency in the human body?2022
• What are Interferons? State their role in the treatment of cancer.2022
• A patient who has undergone an organ transplant is put on 'immunosuppressant'. Name the 'immunosuppressant' and its source…2022
• A boy developed some allergic reactions when he straight entered into his air conditioned room after a game of football outside…2022
• Ringworm is one of the most common infectious fungal disease in humans. Name any two genera of fungi which cause ringworm and…2022
• What are proto oncogenes and why are they called so?2022
• Mention the two types of acquired immune responses present in our body. Give one major role of each.2022
• A person suffering from AIDS dies of opportunistic infections (ARC) i.e., infections that could have been otherwise overcome. (i)…2022
• (i) Write the Scientific name of the plant from where natural cannabinoids are obtained. (ii) Mention the parts of the plant that…2022
• State the mode of action of cocain on human body. Write the scientific name of the source plant it is obtained from. OR Enumerate…2022
• What is the importance of female Anopheles mosquitoes in the life of a malarial Parasite Plasmodium?2022
• When tourists go to places of high altitude like Rohtang Pass or Mansarovar, they are advised not to venture out for two days at…2022
• Explain the role of ' B ' and ' T ' lymphocytes in providing immunity to humans.2022
• Different types of antibodies are produced in our body by the B-lymphocytes in response to a pathogen that enters in our blood.…2022
• 'An HIV patient normally doesn't die of 'AIDS', but death is caused due to many other infections.' Do you agree with the…2022
• Many people experience allergic symptoms of sneezing or wheezing on exposure to certain substances in the environment. Give two…2022
• Plasmodium enters the human body through the bite of infected female Anopheles. Trace its life cycle till the onset of malaria in…2022
• When Plasmodium sp. (malarial parasite) enters the human body, it reproduces asexually and increases its number. During this…2022
• Over the last century, vaccination has been the most effective medical strategy to control infectious diseases. Explain the…2022
• Name and state the type of immunity that acts as a 'biological shield' to the developing foetus against many infections in the…2022
• Write the complete name of the diagnostic test for AIDS. Explain the principle it works on. Name the type of genetic material…2022
• A patient complains of suffering from constipation, stomach ache, stool with blood clots and excess mucous. The physician…2022
• Explain the property of contact inhibition and its effect on normal human cells and cancerous cells. Why are biological modifiers…2022
• Explain the roles of (i) primary, and (ii) secondary lymphoid organs that are responsible for developing defence to combat the…2022

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