PREMIUM KV & CBSE QUESTION BANK WITH ANSWERS Class Class 8 Subject Science Chapter Chapter 3: Health: The Ultimate Treasure Board CBSE / Kendriya Vidyalaya (KVS) Session Academic Session 2026-27 Practice • Learn • Revise • Excel Includes: 20 MCQs • 10 Very Short • 8 Short-I (2M) • 8 Short-II (3M) 6 Long Answer (5M) • 8 Competency-Based • 6 Assertion-Reason 3 Case Studies • 3 Source-Based Sets • 6 HOTS Questions Aligned with NCERT • CBSE 2026-27 • KVS • NEP 2020 • Bloom's Taxonomy Prepared By Ekaparna Sahu B.Sc., M.Sc., B.Ed., M.Ed. For KV Periodic Tests • Unit Tests • Half-Yearly • Annual Examinations
Premium KV & CBSE Question Bank | Class 8 Science | Ch. 3: Health Session 2026-27 Page 2 • Prepared by Ekaparna Sahu • Practice • Learn • Revise • Excel TABLE OF CONTENTS Section Title Questions Marks Section A Multiple Choice Questions (MCQs) 20 Qs 1 Mark each Section B Very Short Answer Questions 10 Qs 1 Mark each Section C Short Answer Questions – I 8 Qs 2 Marks each Section D Short Answer Questions – II 8 Qs 3 Marks each Section E Long Answer Questions 6 Qs 5 Marks each Section F Competency-Based Questions 8 Qs 2–3 Marks Section G Assertion & Reason 6 Qs 1 Mark each Section H Case-Based Questions 3 Cases × 3 2–3 Marks Section I Source-Based Questions 3 Sets × 3 2–3 Marks Section J HOTS (Higher Order Thinking) 6 Qs 3–5 Marks STUDENT INSTRUCTIONS 1. Read each question carefully before answering. 2. MCQs have only one correct option. Choose the most appropriate answer. 3. For Assertion-Reason questions, use the standard CBSE codes (A / B / C / D). 4. Write answers in the space provided or in your answer booklet as directed. 5. Model answers are given after each question for self-assessment and revision. 6. Difficulty levels: Easy • Moderate • Difficult 7. Bloom's levels indicate the cognitive skill being tested (Remembering → Creating). 8. This question bank is based strictly on NCERT Class 8 Science Chapter 3.
Premium KV & CBSE Question Bank | Class 8 Science | Ch. 3: Health Session 2026-27 Page 3 • Prepared by Ekaparna Sahu • Practice • Learn • Revise • Excel SECTION A • MULTIPLE CHOICE QUESTIONS (MCQs) • 20 × 1 Mark Choose the correct option. Each question carries 1 mark. Answers and brief explanations follow each question. Q1. As per the WHO definition, health is a state of complete physical, mental and social well-being and: A) freedom from all types of stress B) not merely the absence of disease C) ability to run fast D) taking medicines regularly Marks: 1 | Difficulty: Easy | Bloom: Remembering Answer: B Explanation: WHO defines health as more than just the absence of disease. Q2. Which of the following is NOT one of the three aspects of health shown in the textbook? A) Physical B) Mental C) Social D) Financial Marks: 1 | Difficulty: Easy | Bloom: Remembering Answer: D Explanation: The three aspects of health are physical, mental and social well-being. Q3. Disease-causing organisms are collectively known as: A) Vectors B) Pathogens C) Antibodies D) Antigens Marks: 1 | Difficulty: Easy | Bloom: Remembering Answer: B Explanation: Pathogens are organisms such as bacteria, viruses, fungi and protozoa that cause disease. Q4. Which disease is a non-communicable disease? A) Typhoid B) Chickenpox C) Diabetes D) Measles Marks: 1 | Difficulty: Easy | Bloom: Understanding Answer: C Explanation: Diabetes is linked to lifestyle and does not spread from person to person. Q5. Insects that spread pathogens from one host to another are called: A) Pathogens B) Vectors C) Parasites D) Antibiotics Marks: 1 | Difficulty: Easy | Bloom: Remembering Answer: B Explanation: Mosquitoes and houseflies that transmit pathogens are called vectors. Q6. Which of the following is the causal agent of malaria? A) Bacteria B) Virus C) Protozoa D) Worm Marks: 1 | Difficulty: Easy | Bloom: Remembering Answer: C Explanation: Malaria is caused by a protozoan parasite transmitted by mosquitoes.
Premium KV & CBSE Question Bank | Class 8 Science | Ch. 3: Health Session 2026-27 Page 4 • Prepared by Ekaparna Sahu • Practice • Learn • Revise • Excel Q7. A symptom is best described as: A) Something a doctor can measure with an instrument B) Something the patient feels, such as pain C) A type of vaccine D) A type of pathogen Marks: 1 | Difficulty: Easy | Bloom: Understanding Answer: B Explanation: Symptoms are subjective and felt by the patient, e.g., pain or tiredness. Q8. Which of these diseases spreads through contaminated water and food? A) Cholera B) Common cold C) Malaria D) Tuberculosis Marks: 1 | Difficulty: Moderate | Bloom: Understanding Answer: A Explanation: Cholera spreads through contaminated drinking water and food. Q9. The scientist who discovered the smallpox vaccine was: A) Alexander Fleming B) Edward Jenner C) Kamal Ranadive D) Maharaj Kishan Bhan Marks: 1 | Difficulty: Easy | Bloom: Remembering Answer: B Explanation: Edward Jenner discovered that cowpox exposure protected milkmaids from smallpox. Q10. Antibiotics are effective against: A) Viral infections only B) Bacterial infections only C) All pathogens equally D) Protozoan infections only Marks: 1 | Difficulty: Moderate | Bloom: Understanding Answer: B Explanation: Antibiotics target structures unique to bacterial cells and do not work on viruses or protozoa. Q11. The traditional Indian practice of scratching skin with material from a smallpox sore to build immunity was called: A) Vaccination B) Variolation C) Pasteurization D) Sterilization Marks: 1 | Difficulty: Moderate | Bloom: Remembering Answer: B Explanation: This traditional method, performed by teekedaars, is called variolation. Q12. Protection developed in the body after exposure to a pathogen or vaccine is called: A) Innate immunity B) Acquired immunity C) Antibiotic resistance D) Vector control Marks: 1 | Difficulty: Moderate | Bloom: Understanding Answer: B Explanation: Acquired immunity develops specifically after exposure to a pathogen or a vaccine.
Premium KV & CBSE Question Bank | Class 8 Science | Ch. 3: Health Session 2026-27 Page 5 • Prepared by Ekaparna Sahu • Practice • Learn • Revise • Excel Q13. Which of the following is a deficiency disease? A) Diabetes B) Scurvy C) Cholera D) Dengue Marks: 1 | Difficulty: Moderate | Bloom: Remembering Answer: B Explanation: Scurvy is caused by a lack of Vitamin C in the diet and is a deficiency disease. Q14. A disease that persists for more than three months is classified as a: A) Communicable disease B) Chronic disease C) Vector-borne disease D) Deficiency disease Marks: 1 | Difficulty: Easy | Bloom: Remembering Answer: B Explanation: Long-lasting diseases like diabetes and cancer are called chronic diseases. Q15. Which combination correctly matches disease with causal agent? A) Tuberculosis - Virus B) Typhoid - Bacteria C) Ascariasis - Bacteria D) Dengue fever - Bacteria Marks: 1 | Difficulty: Moderate | Bloom: Applying Answer: B Explanation: Typhoid is caused by bacteria that infect the intestine. Q16. Penicillin, the first antibiotic, was discovered by: A) Edward Jenner B) Alexander Fleming C) Louis Pasteur D) Robert Koch Marks: 1 | Difficulty: Easy | Bloom: Remembering Answer: B Explanation: Alexander Fleming discovered penicillin in 1928 from a mould that killed bacteria. Q17. Antibiotic resistance mainly develops due to: A) Regular vaccination B) Indiscriminate/incomplete use of antibiotics C) Drinking boiled water D) Wearing masks Marks: 1 | Difficulty: Moderate | Bloom: Understanding Answer: B Explanation: Taking antibiotics unnecessarily or not completing the dose allows resistant bacteria to survive and multiply. Q18. Which of the following measures helps prevent vector-borne diseases like malaria and dengue? A) Drinking boiled water B) Using mosquito nets and repellents C) Covering mouth while sneezing D) Taking antibiotics regularly Marks: 1 | Difficulty: Easy | Bloom: Applying Answer: B Explanation: Mosquito nets, repellents and controlling mosquito breeding prevent vector-borne diseases.
Premium KV & CBSE Question Bank | Class 8 Science | Ch. 3: Health Session 2026-27 Page 6 • Prepared by Ekaparna Sahu • Practice • Learn • Revise • Excel Q19. Vaccines work mainly by: A) Killing bacteria directly in the body B) Training the immune system to recognise and attack pathogens C) Providing nutrients to the body D) Replacing damaged organs Marks: 1 | Difficulty: Moderate | Bloom: Understanding Answer: B Explanation: Vaccines train the immune system using weakened, dead, or harmless parts of a pathogen. Q20. Which statement about vaccines is correct? A) Vaccines cure a disease once a person is already sick B) Vaccines are curative, not preventive C) Vaccines are preventive, not curative D) Vaccines work against all pathogens equally Marks: 1 | Difficulty: Moderate | Bloom: Understanding Answer: C Explanation: Vaccines help prevent disease before it happens; they do not cure an existing infection.
Premium KV & CBSE Question Bank | Class 8 Science | Ch. 3: Health Session 2026-27 Page 7 • Prepared by Ekaparna Sahu • Practice • Learn • Revise • Excel SECTION B • VERY SHORT ANSWER QUESTIONS • 10 × 1 Mark Answer in one word or one line. Each question carries 1 mark. Q1. Define health as per the World Health Organization (WHO). Marks: 1 | Difficulty: Easy | Bloom: Remembering Answer: A state of complete physical, mental and social well-being, and not merely the absence of disease. Q2. What is a pathogen? Marks: 1 | Difficulty: Easy | Bloom: Remembering Answer: A disease-causing organism such as bacteria, virus, fungus, protozoa or worm. Q3. Name any two communicable diseases. Marks: 1 | Difficulty: Easy | Bloom: Remembering Answer: Typhoid and dengue (or any other valid examples like flu, chickenpox, COVID-19). Q4. Name any two non-communicable diseases. Marks: 1 | Difficulty: Easy | Bloom: Remembering Answer: Diabetes and asthma (or cancer, heart disease). Q5. What is a vector? Give one example. Marks: 1 | Difficulty: Easy | Bloom: Understanding Answer: An insect that spreads pathogens from an infected host to a healthy person; example: mosquito. Q6. Differentiate a symptom from a sign in one line. Marks: 1 | Difficulty: Moderate | Bloom: Understanding Answer: A symptom is felt by the patient (e.g., pain); a sign can be seen or measured (e.g., fever). Q7. What are antibiotics used for? Marks: 1 | Difficulty: Easy | Bloom: Remembering Answer: Antibiotics are medicines used to kill bacteria that cause disease. Q8. Who discovered the first vaccine and against which disease? Marks: 1 | Difficulty: Easy | Bloom: Remembering Answer: Edward Jenner discovered the first vaccine, against smallpox. Q9. What is meant by antibiotic resistance? Marks: 1 | Difficulty: Moderate | Bloom: Understanding Answer: A condition where bacteria survive and multiply despite treatment with an antibiotic that earlier killed them. Q10. Name one deficiency disease and the nutrient whose lack causes it. Marks: 1 | Difficulty: Moderate | Bloom: Remembering Answer: Scurvy, caused by a deficiency of Vitamin C.
Premium KV & CBSE Question Bank | Class 8 Science | Ch. 3: Health Session 2026-27 Page 8 • Prepared by Ekaparna Sahu • Practice • Learn • Revise • Excel SECTION C • SHORT ANSWER QUESTIONS – I • 8 × 2 Marks Answer in 3–4 lines. Each question carries 2 marks. Q1. Why is health considered more than just the absence of disease? Marks: 2 | Difficulty: Easy | Bloom: Understanding Model Answer: Health includes physical fitness, a positive mental state, and good social relationships. A person may have no disease but still feel unwell due to loneliness or stress, so all three aspects together define true health. Q2. List any four healthy lifestyle habits mentioned in the chapter. Marks: 2 | Difficulty: Easy | Bloom: Remembering Model Answer: Eating a balanced diet, staying physically active, getting enough sleep, and avoiding harmful substances like tobacco and alcohol. Q3. How does a clean environment help in staying healthy? Marks: 2 | Difficulty: Moderate | Bloom: Understanding Model Answer: Clean air and water reduce the risk of respiratory problems and water-borne diseases. A hygienic surrounding lowers the chances of infection from pathogens, insects and pollution, keeping people healthier. Q4. Distinguish between communicable and non-communicable diseases with one example each. Marks: 2 | Difficulty: Moderate | Bloom: Understanding Model Answer: Communicable diseases are caused by pathogens and spread from person to person, e.g., typhoid. Non-communicable diseases are linked to lifestyle or environment and do not spread, e.g., diabetes. Q5. Explain how communicable diseases commonly spread from an infected to a healthy person. Marks: 2 | Difficulty: Moderate | Bloom: Understanding Model Answer: They spread through air (coughing/sneezing), direct contact (shaking hands), indirect contact (sharing items), contaminated food/water, or through vectors like mosquitoes and infected animals. Q6. What precautions can help prevent the spread of infectious diseases? (Any two) Marks: 2 | Difficulty: Easy | Bloom: Applying Model Answer: Washing hands frequently with soap; covering the mouth and nose while coughing/sneezing; and avoiding sharing personal items like towels. Q7. Why should antibiotics not be taken for viral infections like a common cold? Marks: 2 | Difficulty: Moderate | Bloom: Analysing Model Answer: Antibiotics act only on bacteria by targeting structures unique to bacterial cells; they have no effect on viruses, so taking them for viral infections is useless and can promote antibiotic resistance. Q8. What is acquired immunity? How is it different from natural immunity present from birth? Marks: 2 | Difficulty: Difficult | Bloom: Understanding Model Answer: Acquired immunity is protection the body develops after exposure to a pathogen or a vaccine, whereas natural/innate immunity is present in the body from birth without prior exposure to a specific pathogen.
Premium KV & CBSE Question Bank | Class 8 Science | Ch. 3: Health Session 2026-27 Page 9 • Prepared by Ekaparna Sahu • Practice • Learn • Revise • Excel SECTION D • SHORT ANSWER QUESTIONS – II • 8 × 3 Marks Answer in about 5 lines / structured points. Each question carries 3 marks. Q1. Explain, with an example, how Ayurveda views the concept of true health. Marks: 3 | Difficulty: Moderate | Bloom: Understanding Model Answer: - Ayurveda considers true health a balance of body, mind, and surroundings. - Following dinacharya (daily routine) and ritucharya (seasonal routine) helps maintain this balance. - Eating fresh food suited to one's prakriti, regular exercise, cleanliness, restful sleep, yoga and meditation support overall well-being. Q2. Describe the different modes of transmission of communicable diseases shown in Fig. 3.4. Marks: 3 | Difficulty: Moderate | Bloom: Understanding Model Answer: - By air: through coughing or sneezing of an infected person. - Direct contact: e.g., shaking hands. - Indirect contact: sharing contaminated personal items. - Through food and water: consuming contaminated food/water. - Through vectors: mosquitoes/insects and rabid animals. Q3. With reference to Table 3.1, describe the causal agent, site of infection and one preventive measure each for malaria and dengue fever. Marks: 3 | Difficulty: Moderate | Bloom: Applying Model Answer: - Malaria: caused by protozoa, infects skin/blood; prevented by using mosquito nets and repellents. - Dengue fever: caused by a virus, infects skin/blood; prevented by avoiding stagnant water and mosquito breeding sites. - Both are transmitted by mosquitoes acting as vectors. Q4. Explain Edward Jenner's discovery of the smallpox vaccine using the 'observation-hypothesis-experiment' approach. Marks: 3 | Difficulty: Difficult | Bloom: Analysing Model Answer: - Observation: Milkmaids who had cowpox did not catch smallpox. - Hypothesis: Content in cowpox pus protected people from smallpox. - Experiment: He injected cowpox sap into a boy who later showed no illness on exposure to smallpox. - Result/Application: People became resistant to smallpox, and mass vaccination eventually eradicated it worldwide. Q5. How do vaccines help the body develop acquired immunity? Explain briefly. Marks: 3 | Difficulty: Moderate | Bloom: Understanding Model Answer: - Vaccines contain weakened/dead pathogens or harmless parts of a pathogen. - They train the immune system to recognise and attack the harmful germ without causing the actual disease. - This builds acquired immunity so the body can respond quickly if it meets the real pathogen later. Q6. Describe how antibiotic-resistant bacteria spread in the community, based on Fig. 3.5(a). Marks: 3 | Difficulty: Difficult | Bloom: Analysing Model Answer: - Overuse or incomplete doses of antibiotics let resistant bacteria develop in humans and animals. - Resistant bacteria spread through animal food products, crops (via manure), and hospitals with poor hygiene. - These resistant bacteria eventually spread among the wider community, making infections harder to treat.
Premium KV & CBSE Question Bank | Class 8 Science | Ch. 3: Health Session 2026-27 Page 10 • Prepared by Ekaparna Sahu • Practice • Learn • Revise • Excel Q7. What steps should be taken to reduce the problem of antibiotic resistance? Marks: 3 | Difficulty: Moderate | Bloom: Applying Model Answer: - Use antibiotics only when prescribed by a doctor. - Take the correct dose for the full prescribed duration. - Avoid using antibiotics unnecessarily, including in livestock without proper guidance. - Maintain hygiene to reduce the need for antibiotics in the first place. Q8. Explain why some non-communicable diseases like diabetes are becoming more common in India. Marks: 3 | Difficulty: Moderate | Bloom: Understanding Model Answer: - Changes in lifestyle such as eating more processed food and getting less exercise. - People living longer lives, increasing chances of lifestyle diseases. - Hormonal imbalances and being overweight or obese also contribute. - These combined factors make NCDs a leading cause of death in India today.
Premium KV & CBSE Question Bank | Class 8 Science | Ch. 3: Health Session 2026-27 Page 11 • Prepared by Ekaparna Sahu • Practice • Learn • Revise • Excel SECTION E • LONG ANSWER QUESTIONS • 6 × 5 Marks Answer in detail (bullet points / structured). Each question carries 5 marks. Q1. Discuss in detail the various methods of transmission of communicable diseases and the general precautions that help prevent their spread. Marks: 5 | Difficulty: Difficult | Bloom: Analysing Model Answer: - Communicable diseases are caused by pathogens and spread from an infected person to a healthy one. - Modes of spread: through air (coughing/sneezing), direct contact (touching/shaking hands), indirect contact (sharing personal items), contaminated food and water, and vectors like mosquitoes or rabid animals. - General precautions: washing hands with soap regularly, covering mouth and nose while coughing or sneezing, wearing masks in crowded places. - Avoid sharing personal items like towels and handkerchiefs; keep home, food and water clean. - Staying home and resting when unwell helps the body recover and prevents spreading the disease to others. - Vaccination against specific diseases further strengthens community-wide protection. Q2. Explain the difference between communicable and non-communicable diseases. Support your answer with a table showing at least three examples of each along with their causes. Marks: 5 | Difficulty: Moderate | Bloom: Analysing Model Answer: - Communicable diseases are caused by pathogens (bacteria, viruses, fungi, protozoa, worms) and can spread from person to person. - Examples: Typhoid (bacteria), Dengue (virus), Malaria (protozoa). - Non-communicable diseases are not caused by pathogens; they are linked to lifestyle, diet or environment and do not spread between people. - Examples: Diabetes (lifestyle/hormonal), Asthma (environmental/genetic), Cancer (lifestyle/environmental factors). - Understanding this difference helps design different prevention strategies: hygiene and vaccination for communicable diseases, and healthy lifestyle changes for non-communicable diseases. Q3. Describe the working of vaccines and explain the story of Edward Jenner's discovery of the smallpox vaccine as an example of scientific thinking. Marks: 5 | Difficulty: Difficult | Bloom: Evaluating Model Answer: - A vaccine trains the immune system to recognise and fight a pathogen using weakened, dead, or harmless parts of the germ, without causing the disease itself. - This creates acquired immunity, i.e., protection developed after exposure to a pathogen or vaccine. - Jenner observed that milkmaids infected with cowpox did not catch smallpox. - He hypothesised that cowpox pus protected against smallpox and tested this by injecting cowpox sap into a boy, who later showed no illness when exposed to smallpox. - His discovery led to the first vaccine, and mass vaccination eventually helped eradicate smallpox worldwide by 1979, showing how careful observation and experimentation lead to major scientific breakthroughs. Q4. What is antibiotic resistance? Explain its causes and describe the steps that individuals, doctors and farmers can take to control it. Marks: 5 | Difficulty: Difficult | Bloom: Evaluating Model Answer: - Antibiotic resistance is a condition where bacteria that were earlier killed by an antibiotic survive and multiply despite treatment with it. - Causes: indiscriminate use of antibiotics, taking incomplete doses, and unnecessary use of antibiotics in livestock and agriculture. - Resistant bacteria can spread through animal food products, crops, hospitals, and direct contact with infected people. - Individuals should take antibiotics only when prescribed, in the correct dose and for the full duration. - Doctors should prescribe antibiotics judiciously, and farmers should avoid unnecessary antibiotic use in animals to prevent resistant bacteria from developing and spreading into the food chain.
Premium KV & CBSE Question Bank | Class 8 Science | Ch. 3: Health Session 2026-27 Page 12 • Prepared by Ekaparna Sahu • Practice • Learn • Revise • Excel Q5. Explain how lifestyle and environmental factors contribute to non-communicable diseases, and suggest measures to prevent them. Marks: 5 | Difficulty: Moderate | Bloom: Analysing Model Answer: - Non-communicable diseases (NCDs) like diabetes, heart disease, obesity and cancer are linked to lifestyle, diet and environment rather than pathogens. - Causes include unhealthy eating habits, lack of physical activity, being overweight, excessive screen time, and pollution. - NCDs are today the most common cause of death in India due to changing lifestyles such as eating more processed food and exercising less. - Preventive measures: eating a balanced diet rich in fruits and vegetables, staying physically active, limiting screen time, getting enough sleep, and avoiding tobacco and alcohol. - Regular health check-ups and early diagnosis also help manage and control disease progression. Q6. Health is described as having physical, mental and social dimensions. Explain each dimension with examples from the chapter and discuss how they are interconnected. Marks: 5 | Difficulty: Difficult | Bloom: Evaluating Model Answer: - Physical health refers to the proper functioning of the body, achieved through balanced diet, exercise and adequate sleep. - Mental health refers to a positive mindset and emotional well-being, which can be affected by stress, worry or loneliness. - Social health refers to healthy relationships and the ability to adjust well with peer groups and society. - The chapter's example of a Grade 8 student who felt lonely after moving cities shows how poor social health (loneliness) led to physical symptoms (headaches, weight loss) and required counselling, not just medicine. - This shows the three dimensions are interconnected; neglecting one can affect the others, so true health requires attention to all three together.
Premium KV & CBSE Question Bank | Class 8 Science | Ch. 3: Health Session 2026-27 Page 13 • Prepared by Ekaparna Sahu • Practice • Learn • Revise • Excel SECTION F • COMPETENCY-BASED QUESTIONS • 8 Questions Real-life application, reasoning and decision-making. Answer as directed (approx. 2–3 marks). Q1. Your friend spends most of his free time on his mobile phone, rarely plays outdoors, and often complains of headaches and poor sleep. As a responsible classmate, what advice would you give him, and why? Difficulty: Easy | Bloom: Applying Model Answer: Advise him to limit screen time, spend more time outdoors and physically active, and maintain a proper sleep schedule, since excessive screen use is linked to headaches, sleep disorders and reduced social interaction, all of which affect overall health. Q2. A new housing colony has been built near a stagnant water body. Predict the health risks the residents might face and suggest preventive measures. Difficulty: Moderate | Bloom: Applying Model Answer: Risk: increased breeding of mosquitoes leading to malaria and dengue. Measures: remove stagnant water, use mosquito nets/repellents, and involve local authorities in fogging and cleanliness drives. Q3. Your grandmother says antibiotics cured her cold quickly last year, so she wants to take the same antibiotic for her grandson's current cold. What would you explain to her? Difficulty: Moderate | Bloom: Analysing Model Answer: Explain that a cold is caused by a virus, and antibiotics only work against bacteria; using them unnecessarily will not help and may contribute to antibiotic resistance, so a doctor should be consulted instead. Q4. During a community health camp, you observe that many children have not been vaccinated. As a student ambassador, design one key message to convince parents about the importance of vaccination. Difficulty: Moderate | Bloom: Creating Model Answer: Sample message: 'Vaccines protect your child from serious diseases like measles and polio before they occur, and also protect the whole community by preventing the spread of infection — getting vaccinated is a small step for a lifetime of protection.' Q5. Your school canteen mostly sells fried and sugary snacks. As a student council member, propose two changes to promote better health among students. Difficulty: Easy | Bloom: Creating Model Answer: Introduce healthier options like fresh fruits, salads and whole-grain snacks, and reduce the availability of fried/sugary items; also display nutrition information to help students make informed choices. Q6. A relative in a rural area developed a fever, rash and joint pain shortly after the monsoon. Based on the chapter, what disease might this indicate, and what precaution would you recommend? Difficulty: Moderate | Bloom: Analysing Model Answer: This could indicate dengue fever, common after monsoon due to mosquito breeding in stagnant water; recommend using mosquito nets/repellents and eliminating stagnant water around the house. Q7. You notice that a family in your neighbourhood does not wash their hands before meals and often falls sick. Explain the connection and suggest a simple daily habit to break this cycle. Difficulty: Easy | Bloom: Applying Model Answer: Not washing hands allows pathogens to enter the body through food, causing frequent infections like diarrhoea; suggest regular handwashing with soap before meals and after using the toilet as a simple preventive habit.
Premium KV & CBSE Question Bank | Class 8 Science | Ch. 3: Health Session 2026-27 Page 14 • Prepared by Ekaparna Sahu • Practice • Learn • Revise • Excel Q8. Your uncle, who has diabetes, says he doesn't need to change his diet as long as he takes his medicine. How would you respond using what you learnt about non-communicable diseases? Difficulty: Moderate | Bloom: Evaluating Model Answer: Explain that diabetes management requires both medication and lifestyle changes such as a balanced diet, regular exercise and weight control; relying on medicine alone may not fully control the disease and could lead to complications.
Premium KV & CBSE Question Bank | Class 8 Science | Ch. 3: Health Session 2026-27 Page 15 • Prepared by Ekaparna Sahu • Practice • Learn • Revise • Excel SECTION G • ASSERTION & REASON • 6 × 1 Mark Directions: In the following questions, a statement of Assertion (A) is followed by a statement of Reason (R). Mark the correct choice as per the codes given below. Codes: A) Both Assertion (A) and Reason (R) are true, and R is the correct explanation of A. B) Both Assertion (A) and Reason (R) are true, but R is NOT the correct explanation of A. C) Assertion (A) is true, but Reason (R) is false. D) Assertion (A) is false, but Reason (R) is true. Q1. Assertion (A): Vaccines can prevent serious diseases such as polio and measles. Reason (R): Vaccines train the immune system to recognise and fight specific pathogens without causing the disease. Marks: 1 | Difficulty: Easy | Bloom: Understanding Answer: A Explanation: Both statements are true, and the reason correctly explains why vaccines work. Q2. Assertion (A): Antibiotics can be used to treat the common cold effectively. Reason (R): The common cold is caused by a virus, and antibiotics act only against bacteria. Marks: 1 | Difficulty: Moderate | Bloom: Analysing Answer: D Explanation: The assertion is false since antibiotics don't work on viral colds; the reason correctly explains why. Q3. Assertion (A): Diabetes is classified as a non-communicable disease. Reason (R): Diabetes spreads from an infected person to a healthy person through contact. Marks: 1 | Difficulty: Moderate | Bloom: Analysing Answer: C Explanation: Diabetes is indeed non-communicable, but it does not spread between people, so the reason is false. Q4. Assertion (A): Mosquitoes are called vectors. Reason (R): Mosquitoes transmit pathogens such as those causing malaria and dengue from an infected person to a healthy one. Marks: 1 | Difficulty: Easy | Bloom: Understanding Answer: A Explanation: Both statements are true, and the reason correctly explains why mosquitoes are termed vectors. Q5. Assertion (A): Overuse of antibiotics can lead to antibiotic resistance. Reason (R): Resistant bacteria develop when few bacteria that survive antibiotic treatment multiply and spread. Marks: 1 | Difficulty: Moderate | Bloom: Understanding Answer: A Explanation: Both statements are true, and the reason correctly explains the mechanism of resistance development. Q6. Assertion (A): A person who eats well and lives in a clean place can never feel unwell. Reason (R): Health also depends on mental and social well-being, not only on diet and cleanliness. Marks: 1 | Difficulty: Difficult | Bloom: Evaluating Answer: D Explanation: The assertion is false as a person can still feel unwell due to loneliness or stress; the reason is true and explains why.
Premium KV & CBSE Question Bank | Class 8 Science | Ch. 3: Health Session 2026-27 Page 16 • Prepared by Ekaparna Sahu • Practice • Learn • Revise • Excel SECTION H • CASE-BASED QUESTIONS • 3 Cases × 3 Questions Read the passage carefully and answer the questions that follow. Each sub-question carries 2–3 marks. Case Study 1 A Grade 8 student moved to a new school in another city. With no friends in his new environment and busy parents, he felt lonely. To cope, he spent more time on his phone and social media, but this made him feel worse. He stopped trying to make friends, had headaches, lost weight, and could not sleep well. A doctor advised less screen time and meeting a counsellor. The school counsellor arranged help to support him in making friends and improving his health. Q1.1 Identify the aspect(s) of health that were affected in the student's case. Difficulty: Easy | Bloom: Understanding Model Answer: His mental and social health were affected (loneliness, stress), which in turn also affected his physical health (headaches, weight loss, poor sleep). Q1.2 Why did increased screen time make the student feel worse instead of better? Difficulty: Moderate | Bloom: Analysing Model Answer: Increased screen time reduced real social interaction and physical activity, and is linked to sleep disorders and anxiety, worsening his overall well-being instead of solving his loneliness. Q1.3 Suggest two steps the student could take to improve his overall health. Difficulty: Moderate | Bloom: Applying Model Answer: Limit screen time and try to make new friends through school activities; talk to family, teachers or a counsellor about his feelings instead of isolating himself. Case Study 2 In Bhadrak district, Odisha, a community sanitation campaign helped more people build and use toilets. This reduced open defecation significantly, and improved child health, with fewer cases of diarrhoea and infections. Q2.1 What type of diseases were reduced due to the sanitation campaign, and why? Difficulty: Easy | Bloom: Understanding Model Answer: Communicable diseases spread through contaminated water and food, such as diarrhoea, were reduced because proper sanitation prevents pathogens from contaminating water and surroundings. Q2.2 Explain the link between open defecation and the spread of communicable diseases. Difficulty: Moderate | Bloom: Analysing Model Answer: Open defecation contaminates soil and water sources with pathogens, which can then spread to healthy people through contaminated food, water, or direct contact, causing diseases like diarrhoea. Q2.3 Suggest one similar community-level initiative that could improve health in your own locality. Difficulty: Moderate | Bloom: Creating Model Answer: A community clean-water and hygiene awareness campaign, encouraging handwashing and safe drinking water practices, could similarly reduce infections in any locality. Case Study 3 Antibiotics are effective in protecting us against bacterial infections and have saved millions of lives. However, their indiscriminate use has led to a decline in their effectiveness. Antibiotic resistance is a phenomenon where bacteria that were earlier killed by a given antibiotic are found to survive and multiply despite treatment with that antibiotic, making common infections harder to treat.
Premium KV & CBSE Question Bank | Class 8 Science | Ch. 3: Health Session 2026-27 Page 17 • Prepared by Ekaparna Sahu • Practice • Learn • Revise • Excel Q3.1 What is antibiotic resistance, based on the passage? Difficulty: Easy | Bloom: Remembering Model Answer: It is a condition where bacteria previously killed by an antibiotic survive and multiply despite continued treatment with that same antibiotic. Q3.2 Explain why indiscriminate use of antibiotics is dangerous for public health. Difficulty: Moderate | Bloom: Analysing Model Answer: It allows resistant bacteria to develop and spread, making common infections harder to treat and increasing the risk of complications, prolonged illness, and even death across the community. Q3.3 Suggest two responsible practices that can help slow down antibiotic resistance. Difficulty: Moderate | Bloom: Applying Model Answer: Take antibiotics only when prescribed by a doctor and complete the full prescribed dose; avoid unnecessary antibiotic use in humans and livestock.
Premium KV & CBSE Question Bank | Class 8 Science | Ch. 3: Health Session 2026-27 Page 18 • Prepared by Ekaparna Sahu • Practice • Learn • Revise • Excel SECTION I • SOURCE-BASED QUESTIONS • 3 Sets × 3 Questions Study the given source (table / data) and answer the questions that follow. Source 1: Diseases spread through the air (from Table 3.1) Disease Causal Agent Site of Infection Key Symptom Common cold & influenza Virus Respiratory tract Nasal congestion, sore throat Chickenpox Virus Respiratory tract, skin Itchy skin, rashes, blisters Tuberculosis (TB) Bacteria Lungs Cough, fever, night sweats Q1.1 Which disease in the table is caused by bacteria rather than a virus? Difficulty: Easy | Bloom: Remembering Model Answer: Tuberculosis (TB). Q1.2 Suggest one common preventive measure applicable to all three diseases listed. Difficulty: Moderate | Bloom: Applying Model Answer: Covering the mouth and nose while coughing or sneezing (or wearing a mask) helps prevent all three air-borne diseases. Q1.3 Why do diseases spread through air require different prevention strategies compared to those spread through water? Difficulty: Difficult | Bloom: Analysing Model Answer: Air-borne diseases spread via respiratory droplets, so prevention focuses on masks, hygiene and isolation, whereas water-borne diseases spread via contamination, so prevention focuses on clean drinking water and sanitation. Source 2: Diseases spread through contaminated water and food Disease Causal Agent Site of Infection Key Symptom Hepatitis A Virus Liver Jaundice, fatigue, nausea Cholera Bacteria Intestine Diarrhoea and dehydration Typhoid Bacteria Intestine Fever, abdominal discomfort Q2.1 Which organ is affected by Hepatitis A? Difficulty: Easy | Bloom: Remembering Model Answer: The liver. Q2.2 What common preventive measure is suggested for all diseases in this table? Difficulty: Moderate | Bloom: Applying Model Answer: Drinking boiled/clean water and consuming properly cooked food, along with maintaining personal hygiene. Q2.3 Explain how a single contaminated water source in a village could lead to an outbreak of more than one disease from this table. Difficulty: Difficult | Bloom: Analysing Model Answer: If a shared water source is contaminated with pathogens, everyone using it for drinking or cooking could be exposed to multiple pathogens (virus, bacteria) at once, leading to simultaneous outbreaks of diseases like cholera, typhoid and Hepatitis A. Source 3: Monthly dengue cases reported in a hospital (one year) Month Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Cases 10 12 15 18 22 40 65 65 65 30 30 20
Premium KV & CBSE Question Bank | Class 8 Science | Ch. 3: Health Session 2026-27 Page 19 • Prepared by Ekaparna Sahu • Practice • Learn • Revise • Excel Q3.1 In which three months were dengue cases the highest? Difficulty: Easy | Bloom: Remembering Model Answer: July, August and September (65 cases each). Q3.2 What natural/environmental factor likely explains the peak in dengue cases during these months? Difficulty: Moderate | Bloom: Analysing Model Answer: These months fall during and after the monsoon season, when stagnant water increases mosquito breeding, raising dengue transmission. Q3.3 Suggest two preventive steps a local government could take before the peak season to reduce dengue spread. Difficulty: Moderate | Bloom: Creating Model Answer: Conduct fogging and larvicide spraying before monsoon, and run public awareness campaigns to eliminate stagnant water in and around homes.
Premium KV & CBSE Question Bank | Class 8 Science | Ch. 3: Health Session 2026-27 Page 20 • Prepared by Ekaparna Sahu • Practice • Learn • Revise • Excel SECTION J • HOTS (Higher Order Thinking Skills) • 6 Questions These questions test critical thinking, analysis, evaluation and problem-solving (approx. 3–5 marks). Q1. Vaccination programmes rely on most people in a community getting vaccinated to protect even those who cannot be vaccinated. Explain this idea using the smallpox eradication example. Difficulty: Difficult | Bloom: Evaluating Model Answer: Mass vaccination against smallpox meant very few people remained susceptible, so the virus could not find new hosts to infect and spread; this eventually broke the chain of transmission entirely, leading to global eradication by 1979, showing how community-wide vaccination protects even unvaccinated individuals. Q2. If antibiotics stopped working completely due to resistance, predict two ways this would affect medical treatment today. Difficulty: Difficult | Bloom: Evaluating Model Answer: Common bacterial infections and injuries could become life-threatening again since they couldn't be treated effectively; routine surgeries and treatments like chemotherapy, which rely on antibiotics to prevent infection, would become much riskier. Q3. A region has good sanitation and clean drinking water but still reports rising cases of diabetes and heart disease. Explain why improving sanitation alone would not solve this problem. Difficulty: Difficult | Bloom: Analysing Model Answer: Diabetes and heart disease are non-communicable diseases linked to lifestyle, diet and physical activity, not to pathogens or contaminated water; therefore, sanitation improvements would not address their root causes, which require lifestyle changes like better diet and exercise instead. Q4. Compare the roles of the immune system and antibiotics in fighting a bacterial infection, and explain why relying only on antibiotics without a healthy immune system is not ideal. Difficulty: Difficult | Bloom: Evaluating Model Answer: The immune system naturally recognises and fights pathogens using white blood cells and antibodies, while antibiotics directly kill or stop the growth of bacteria; however, if the immune system is weak, the body may still struggle to recover fully or fight off future infections, so a healthy lifestyle supporting immunity is equally important alongside antibiotic treatment. Q5. Two neighbouring villages have similar climates, but Village A has frequent malaria outbreaks while Village B does not. Suggest possible reasons for this difference and how it could be investigated. Difficulty: Difficult | Bloom: Analysing Model Answer: Possible reasons include more stagnant water bodies or poor drainage in Village A promoting mosquito breeding, lower use of mosquito nets/repellents, or less awareness about prevention. This could be investigated by comparing mosquito breeding sites, sanitation practices, and health awareness levels between the two villages. Q6. Why might a person who appears physically fit still be considered 'unhealthy' according to the WHO definition? Justify with reasoning based on the chapter. Difficulty: Difficult | Bloom: Evaluating Model Answer: According to the WHO, health includes mental and social well-being in addition to physical fitness; a physically fit person experiencing chronic stress, loneliness or poor relationships would not be considered fully healthy, since well-being requires balance across all three dimensions, not physical fitness alone.
Premium KV & CBSE Question Bank | Class 8 Science | Ch. 3: Health Session 2026-27 Page 21 • Prepared by Ekaparna Sahu • Practice • Learn • Revise • Excel PREMIUM KV & CBSE QUESTION BANK Class 8 Science • Chapter 3: Health – The Ultimate Treasure Practice • Learn • Revise • Excel Prepared by Ekaparna Sahu B.Sc., M.Sc., B.Ed., M.Ed. Based on NCERT Textbook • CBSE Competency-Based Pattern 2026-27 Kendriya Vidyalaya Sangathan Assessment Guidelines • NEP 2020 For classroom practice, periodic tests, half-yearly & annual examinations. All questions and answers are original and aligned strictly with the chapter content. © For educational use • Practice • Learn • Revise • Excel