SEBA Class 9 Science Chapter 13 Why Do We Fall Ill MCQs (2026–27) – Assam Eduverse
Gain a clear understanding of health and diseases with SEBA Class 9 Science Chapter 13 Why Do We Fall Ill MCQs (2026–27), prepared as per the latest ASSEB syllabus and updated board exam pattern. These SEBA Class 9 Science Chapter 13 Why Do We Fall Ill MCQs include important objective questions, concept-based MCQs, and case-oriented practice sets to support effective exam preparation.
Designed by Assam Eduverse subject experts, these SEBA Class 9 Science Chapter 13 MCQs cover essential topics such as health and disease, acute and chronic diseases, infectious and non-infectious diseases, causes, prevention and control, vectors, and principles of treatment. Practicing these Why Do We Fall Ill MCQs Class 9 SEBA and Assam Board Class 9 Science objective questions helps build conceptual clarity and awareness of disease prevention. You can also explore more practice from Class 9 Science chapterwise MCQs and SEBA Class 9 MCQs.
Regular practice of these ASSEB Class 9 Science Important MCQs will improve preparation and boost exam performance. For detailed explanations, visit SEBA Class 9 Science Chapter 13 Why Do We Fall Ill Solutions, or explore additional resources like SEBA Class 9 & 10 study materials and SEBA Class 9 syllabus.
SEBA Class 9 Science Chapter 13 Why Do We Fall Ill MCQs – ASSEB 2026–27 Board Exam Practice
Table of Contents
Before You Start
Test your knowledge with the SEBA Class 9 Science MCQs Quiz. Read each question carefully and select the correct answer. Your answer is checked instantly after you choose an option, and a detailed explanation appears immediately to help you learn every concept and improve your exam preparation.
Assertion (A): Measures taken to maintain a rigorous standard of public hygiene are essential for community welfare.
Reason (R): Proper public sanitation directly helps in reducing a population's exposure to airborne and waterborne infectious agents.
✅ Correct Answer
Concept Explanation
Public health and hygiene deal with ambient environmental conditions. Because infectious pathogens often spread via open garbage, stagnant water, or poor sewage management, maintaining clean surroundings directly cuts down the transmission channels of microbes, validating the assertion.
According to the official definition stated by the World Health Organization (WHO), health is best described as a complete state of:
✅ Correct Answer
Concept Explanation
Being healthy is much broader than just being "disease-free." True health requires perfect harmony across three dimensions: your physical body must function correctly, your mental state must be balanced and stress-free, and you must enjoy positive social relationships within your community.
Assertion (A): Chronic health conditions have long-lasting, severe impacts on an individual's overall lifestyle.
Reason (R): These diseases persist for extended durations, sometimes lasting for years, and continuously disrupt standard organ functions.
✅ Correct Answer
Concept Explanation
Unlike temporary illnesses, chronic diseases progress slowly and lock into the body over long time frames. Because they damage tissues continuously over months or years, they cause long-term fatigue, weight fluctuations, and general poor health, which matches the explanation in the reason.
A pathological condition or illness that develops rapidly and lasts for only a short period of time is classified as an:
✅ Correct Answer
Concept Explanation
Acute diseases hit the body suddenly and run their full course over a few days or weeks before a full recovery is made (e.g., the common cold, influenza, or typhoid). They do not cause lasting or permanent damage to general health.
Assertion (A): Actively suppressing and controlling local mosquito populations is a highly effective way to prevent outbreaks of malaria.
Reason (R): Female Anopheles mosquitoes carry the malaria parasite and act as biological vectors that transmit the pathogen between hosts.
✅ Correct Answer
Concept Explanation
Malaria is caused by the protozoan *Plasmodium*. Because this microscopic parasite cannot migrate through the air on its own, it relies entirely on mosquitoes to act as vectors to inject it into human blood streams. Breaking the vector lifecycle prevents the spread of the disease.
Tuberculosis (TB) is an infectious bacterial disease affecting the lungs that is classified as a:
✅ Correct Answer
Concept Explanation
Tuberculosis, caused by the bacterium *Mycobacterium tuberculosis*, is a definitive chronic disease. It stays in the body for long periods, causing dynamic weight loss, chronic coughing, and damage to lung tissue that requires months of continuous antibiotic therapy to cure.
Assertion (A): Receiving regular, balanced nutrition and good nourishment helps protect the body from catching infectious illnesses.
Reason (R): A well-nourished body maintains a strong immune system that can effectively fight off and destroy invading microbes.
✅ Correct Answer
Concept Explanation
The immune system requires significant energy and protein resources to manufacture defensive antibodies and activate white blood cells. Malnourishment weakens these defense networks, making it easier for pathogens to multiply, whereas a healthy diet provides the resource baseline to fight infections.
In a clinical diagnostic setting, the subjective **symptoms** of a disease represent:
✅ Correct Answer
Concept Explanation
Symptoms are subjective indicators of an illness that are experienced and reported directly by the patient (such as a headache, nausea, or a sore throat). They tell us that something is wrong with our body, but do not provide explicit proof of a specific condition on their own.
Assertion (A): Conventional medical antibiotics can be used as an effective cure to treat the common cold.
Reason (R): The common cold is a widespread infectious condition caused by pathogenic bacterial strains.
✅ Correct Answer
Concept Explanation
Both statements are false. The common cold is a **viral infection** (primarily caused by rhinoviruses), not a bacterial one. Because antibiotics are designed to disrupt specific biochemical synthesis loops found only in bacteria, they are completely ineffective against viruses.
In contrast to subjective symptoms, the **signs** of a disease refer specifically to:
✅ Correct Answer
Concept Explanation
Signs are objective, measurable diagnostic markers that a healthcare professional looks for based on a patient's symptoms (such as observing skin rashes, taking blood pressure, or looking for swelling). They provide specific clues that point toward the exact underlying disease.
Which of the following conditions represents a clear example of an infectious, communicable disease?
✅ Correct Answer
Concept Explanation
Infectious diseases are caused by external pathogens (like bacteria, viruses, fungi, or worms) that can move from an infected person out to healthy individuals. Tuberculosis spreads through the air via tiny droplets when an infected patient coughs. Cancer, hypertension, and diabetes are non-communicable.
Which of the following human health conditions is classified as a non-infectious, non-communicable disease?
✅ Correct Answer
Concept Explanation
Non-infectious diseases are caused by internal factors like genetic mutations, organ malfunction, or lifestyle habits, rather than external infectious agents. For instance, cancer is caused by internal genetic mutations that lead to uncontrolled cell division, meaning it cannot spread from person to person.
Which of the following acute human illnesses is caused directly by an invading viral pathogen?
✅ Correct Answer
Concept Explanation
The common cold, influenza, dengue fever, and AIDS are all triggered by viruses. Typhoid, cholera, and tuberculosis are caused by different types of pathogenic bacteria.
The acute, severe gastrointestinal disease known as cholera spreads within human communities mainly through:
✅ Correct Answer
Concept Explanation
Cholera is a waterborne disease caused by the bacterium *Vibrio cholerae*. It spreads rapidly through communities when water sources or food supplies become contaminated with the fecal matter of an infected individual due to poor sanitation.
In the transmission loop of vector-borne conditions like malaria or dengue, blood-sucking mosquitoes act as:
✅ Correct Answer
Concept Explanation
Animals or insects that transport a disease-causing pathogen from an infected person to a healthy host without catching the illness themselves are called vectors. Female mosquitoes are classic vectors that spread diseases like malaria and dengue while feeding on human blood.
Clinical antibiotic medications are specifically engineered to treat infections caused by:
✅ Correct Answer
Concept Explanation
Antibiotics block vital metabolic pathways unique to bacteria, such as cell wall synthesis or specific protein translation loops. Because other microorganisms like viruses do not share these metabolic pathways, antibiotics are completely ineffective against them.
Why are standard antibiotics completely ineffective at stopping viral infections?
✅ Correct Answer
Concept Explanation
Viruses are simple packages of genetic material that lack an independent metabolism. To replicate, they must hijack the host cell's biochemical pathways. Because they rely on our own cellular machinery rather than their own bacterial-style synthesis loops, antibiotics cannot harm them without damaging our own cells.
The localized immune tissue reaction known as inflammation commonly causes:
✅ Correct Answer
Concept Explanation
When a tissue encounters an infection or injury, the immune system triggers inflammation. This response recruits white blood cells to the area by increasing local blood flow, which causes characteristic signs like redness, heat, swelling, pain, and sometimes a systemic fever.
If an infectious pathogen targets and infects a patient's lungs, the primary symptoms will most likely present as:
✅ Correct Answer
Concept Explanation
The symptoms of an illness depend closely on which organ system the pathogen targets. Since the respiratory system manages gas exchange, a localized lung infection (like pneumonia or tuberculosis) directly impairs respiration, resulting in coughing and breathing difficulties.
If a disease-causing pathogen targets and infects a patient's liver, the clinical sign likely to develop is:
✅ Correct Answer
Concept Explanation
The liver processes metabolic waste, including bilirubin, a yellow pigment produced by the breakdown of old red blood cells. If a pathogen targets the liver (such as the hepatitis virus), the organ can no longer excrete this pigment properly, causing it to accumulate in tissues and produce **jaundice**.
The comprehensive clinical approach used to treat infectious diseases involves:
✅ Correct Answer
Concept Explanation
Effective medical treatment uses a two-pronged strategy. First, physicians use target therapies (like fever reducers or pain relievers) to manage immediate symptoms and comfort the patient. Second, they use specific antimicrobial drugs (like antibiotics) to target and kill the underlying pathogen to cure the infection completely.
The medical proverb "prevention is better than cure" holds true for infectious diseases primarily because:
✅ Correct Answer
Concept Explanation
Curing an illness after it sets in carries significant limitations: a patient suffers from tissue damage during the disease, treatment requires a period of bed rest, and the infected individual can act as a reservoir that spreads the pathogen to family and community members. Proactive prevention avoids all three issues.
Which of the following environmental configurations is necessary to maintain good personal health?
✅ Correct Answer
Concept Explanation
An individual's health is closely linked to their social and physical environment. If public surroundings are filthy and filled with overflowing drains, the risk of disease transmission remains high, regardless of personal habits. Furthermore, mental and social health require community safety and social harmony, making option C correct.
Which of the following psychological or physical conditions is NOT an indicator of good health?
✅ Correct Answer
Concept Explanation
Because true health encompasses mental well-being, dealing with **continuous psychological stress** directly compromises an individual's state of health, even if they show no physical symptoms of a disease.
Assertion (A): Every known medical disease can spread directly from an infected person to a healthy individual.
Reason (R): Every disease that affects the human body is caused by invading microscopic pathogens.
✅ Correct Answer
Concept Explanation
Both statements are false. Diseases are divided into two main categories: infectious and non-infectious. Many conditions—such as genetic disorders, internal organ failure (like kidney disease), or cancers—are caused by internal factors rather than external microbes, meaning they cannot be transmitted between individuals.
Assertion (A): An individual can be in poor health or feel unwell without suffering from any medically identifiable disease.
Reason (R): True biological health encompasses a complete state of physical, mental, and social well-being, rather than just being disease-free.
✅ Correct Answer
Concept Explanation
Health is a broad, holistic concept. A person might not have a clinical infection or organ malfunction, yet they can be in poor health due to chronic mental anxiety, depression, or an unstable social environment. Because health requires physical, mental, and social wellness, the reason perfectly explains the assertion.
Match the disease duration or professional observation parameters in Column I with their definitions in Column II:
| Column I | Column II |
|---|---|
| (a) Acute disease | (1) An illness that targets the body for only a short duration |
| (b) Chronic disease | (2) An illness that persists inside the body for long-term durations |
| (c) Subjective symptom | (3) Physical or mental changes directly felt and reported by the patient |
| (d) Objective sign | (4) Clinical indicators observed and recorded by a medical physician |
✅ Correct Answer
Concept Explanation
Acute diseases run a rapid course and resolve quickly, whereas chronic diseases cause long-term, structural strains on health. Symptoms represent what the patient feels subjectively, while signs are the physical clues a doctor finds through professional observation.
Which of the following listed choices represent core components necessary to achieve true good health? - (i) Sound physical well-being and active organ function
- (ii) Mental well-being free of continuous stress
- (iii) Social well-being and community harmony
- (iv) The simple absence of identifiable medical diseases alone
✅ Correct Answer
Concept Explanation
Good health is a state of complete physical, mental, and social wellness. Simply being free from a recognizable medical disease—statement (iv)—does not guarantee health if the individual is lonely, socially isolated, or under intense psychological duress.
Assertion (A): Overcrowded and poorly ventilated living conditions significantly increase the transmission rates of airborne diseases.
Reason (R): Pathogenic microbes are packed inside tiny moisture droplets released into the surrounding air when an infected person coughs or sneezes.
✅ Correct Answer
Concept Explanation
Airborne pathogens (such as the influenza or tuberculosis microbes) ride on small droplets sprayed from the respiratory tract. In enclosed, packed spaces, nearby people are highly likely to inhale these infectious droplets before they settle, making the reason a clear explanation for the assertion.
Which of the following listed options are communicable, infectious diseases caused by external biological agents? - (i) Protozoan-borne malaria
- (ii) Bacterial tuberculosis
- (iii) Metabolic type-2 diabetes
- (iv) Waterborne cholera
✅ Correct Answer
Concept Explanation
Infectious illnesses are caused by microbial pathogens that can migrate from hosts out to healthy individuals. Malaria (protozoan), tuberculosis (bacterium), and cholera (bacterium) fit this category. Diabetes (iii) is a chronic metabolic malfunction related to insulin regulation, making it non-infectious.
Assertion (A): Infection by the Human Immunodeficiency Virus (HIV) progressively cripples and weakens the body's entire immune system.
Reason (R): HIV specifically targets, infects, and destroys key white blood cells that coordinate the body's daily immune defenses.
✅ Correct Answer
Concept Explanation
HIV does not kill patients directly through its own toxicity. Instead, it retrovirally destroys helper T-lymphocytes, which are the main coordinators of the immune system. Because the body loses its cellular defenses, minor everyday infections (like a cold or mild diarrhea) can become life-threatening. This directly validates why the reason explains the assertion.
Which of the following human diseases are caused by invading pathogenic bacteria? - (i) Cholera outbreaks
- (ii) Typhoid fever
- (iii) Pulmonary tuberculosis
- (iv) The common cold
✅ Correct Answer
Concept Explanation
Cholera (*Vibrio cholerae*), typhoid (*Salmonella typhi*), and tuberculosis (*Mycobacterium tuberculosis*) are all bacterial infections that can be treated with targeted antibiotics. The common cold (iv) is an acute infection triggered by rhinoviruses.
Match the infectious disease in Column I with its primary transmission medium or vector listed in Column II:
| Column I | Column II |
|---|---|
| (a) Cholera | (1) Waterborne ingestion channel |
| (b) Tuberculosis | (2) Airborne respiratory droplets |
| (c) Malaria | (3) Blood-sucking mosquito vector |
| (d) AIDS | (4) Intimate sexual contact or fluid exchange |
✅ Correct Answer
Concept Explanation
Cholera spreads via contaminated water. Tuberculosis is caught by inhaling airborne respiratory droplets. Malaria relies on an Anopheles mosquito vector to hop between hosts, and AIDS requires direct fluid contact like intimate sexual transmission or shared needles.
Assertion (A): Clinical vaccination prevents the onset of an infectious disease by directly targeting and killing invading microbes.
Reason (R): Vaccines safely introduce dead or weakened antigens to develop a long-lasting protective immunological memory.
✅ Correct Answer
Concept Explanation
The assertion is false because vaccines do not contain active drugs that directly kill pathogens. Instead, they introduce a harmless, mimic version of the microbe. This trains the immune system and generates memory cells, so if the real pathogen ever attacks, our body can produce a rapid response to eliminate it. This makes the reason statement true.
Which of the following dangerous human diseases are transmitted through the bites of mosquito vectors? - (i) Protozoan-borne malaria
- (ii) Brain-targeting Japanese encephalitis
- (iii) Intestinal bacterial cholera
- (iv) Viral dengue fever
✅ Correct Answer
Concept Explanation
Malaria (carried by *Anopheles*), Japanese encephalitis (brain fever, carried by *Culex*), and Dengue (carried by *Aedes*) are all vector-borne conditions that rely on mosquitoes for transmission. Cholera (iii) is a waterborne infection that spreads through contaminated food and water.
Match the biological pathogen groups in Column I with their associated clinical disease examples in Column II:
| Column I | Column II |
|---|---|
| (a) Bacteria | (1) Acute intestinal Cholera |
| (b) Virus | (2) Highly contagious Common cold |
| (c) Protozoa | (3) Vector-borne Malaria |
| (d) Parasitic Worm | (4) Intestinal elephantiasis or Ascaris |
✅ Correct Answer
Concept Explanation
Cholera is a bacterial infection. The common cold is a viral infection. Malaria is caused by a protozoan parasite (*Plasmodium*), and *Ascaris* represents an infection caused by intestinal roundworms.
Assertion (A): Providing an uninfected community with clean, treated drinking water is a guaranteed method to control cholera outbreaks.
Reason (R): The pathogenic bacterial strains that cause cholera are transmitted through the consumption of contaminated water.
✅ Correct Answer
Concept Explanation
Because *Vibrio cholerae* is a waterborne pathogen, it infects people who consume contaminated food or water. Providing safe, filtered, and chlorinated drinking water breaks this transmission pathway, directly supporting the assertion.
Which of the following options list standard external pathways or mediums that allow infectious diseases to spread? - (i) Atmospheric air currents
- (ii) Contaminated public water channels
- (iii) Biological insect vectors
- (iv) Maintaining high personal and public sanitation standards
✅ Correct Answer
Concept Explanation
Communicable diseases move from source reservoirs to healthy hosts via environmental vehicles like air (droplets), water, food, or animal vectors (like fleas or mosquitoes). Proper sanitation (iv) is a method used to block these pathways, rather than a channel of transmission itself.
Match the localized organ infection in Column I with its expected physiological sign or reaction listed in Column II:
| Column I | Column II |
|---|---|
| (a) Localized liver infection | (1) Clinical jaundice and metabolic pigment accumulation |
| (b) Pulmonary lung infection | (2) Persistent coughing fits and shortness of breath |
| (c) Encephalitic brain infection | (3) Acute neurological fits, seizures, or unconsciousness |
| (d) Intestinal gut infection | (4) Severe loose motions, vomiting, and dehydration |
✅ Correct Answer
Concept Explanation
Liver infections disrupt bile metabolism, causing jaundice. Lung tissue damage causes coughing and shortness of breath. Brain-targeting pathogens cause neurological signs like seizures or fits, and infections in the digestive tract result in vomiting and loose motions.
Which of the following changes or discomforts are classified as subjective **symptoms** rather than objective signs? - (i) A localized, throbbing headache
- (ii) A persistent full-body fever
- (iii) Frequent loose motions
- (iv) A blood report from a laboratory analyzer
✅ Correct Answer
Concept Explanation
Symptoms are the bodily changes that an individual experiences subjectively (such as feeling a headache, detecting a fever, or suffering from loose motions). A laboratory report (iv) provides an objective, measurable diagnostic standard, which classifies it as a clinical sign rather than a symptom.
Match the medical intervention in Column I with its appropriate target or mechanism listed in Column II:
| Column I | Column II |
|---|---|
| (a) Prescription Penicillin | (1) Blocks cell wall synthesis to kill bacteria |
| (b) Preventive Vaccination | (2) Introduces safe antigens to develop adaptive immunity |
| (c) Mosquito control | (3) Eliminates insect vectors to prevent malaria transmission |
| (d) Secure water treatment | (4) Eliminates waterborne pathogens to prevent cholera |
✅ Correct Answer
Concept Explanation
Penicillin is an antibiotic that blocks bacterial cell wall synthesis. Vaccines train host lymphocytes before exposure. Controlling standing water targets mosquito vectors, and treating tap water prevents waterborne diseases like cholera.
Which of the following features are common characteristics of viruses? - (i) They can only replicate inside active host cells
- (ii) They possess very little biochemical metabolic machinery of their own
- (iii) They can be easily killed using common antibiotic regimens
- (iv) They hijack the host cell's metabolic systems to build viral components
✅ Correct Answer
Concept Explanation
Viruses occupy a boundary zone between living and non-living matter. They lack independent cell components and metabolic pathways, which means they are unaffected by antibiotics—statement (iii). Instead, they function as intracellular parasites, hijacking host cell structures to replicate.
Match the transmission channels in Column I with their associated communicable illnesses listed in Column II:
| Column I | Column II |
|---|---|
| (a) Environmental air channels | (1) Respiratory droplets carrying Tuberculosis bacteria |
| (b) Contaminated water currents | (2) Fecal-oral pathogens carrying Cholera |
| (c) Biological animal vectors | (3) Mosquito-borne Malaria |
| (d) Intimate sexual contact | (4) Fluid-borne HIV or AIDS |
✅ Correct Answer
Concept Explanation
Tuberculosis spreads via air currents. Cholera is a classic waterborne disease. Malaria relies on an animal vector to migrate between hosts, and HIV requires intimate contact or fluid exchange.
Which of the following listed signs or physiological changes can be caused by localized cellular inflammation? - (i) Accumulation of fluid causing local swelling
- (ii) Irritation of local nerve fibers causing pain
- (iii) Elevated system-wide body fever
- (iv) Rapid structural hair loss
✅ Correct Answer
Concept Explanation
Inflammation is a localized immune defense response. Signaling molecules increase regional blood flow and cause fluid leakage, resulting in swelling, redness, heat, and pain. If the infection is systemic, it can trigger a full-body fever. Hair loss (iv) is related to distinct hormonal or genetic conditions.
Match the immunological concept in Column I with its appropriate description in Column II:
| Column I | Column II |
|---|---|
| (a) Tissue Inflammation | (1) Localized reaction causing swelling, heat, and pain |
| (b) Immune system | (2) Internal physiological network that fights infections |
| (c) Clinical Antibiotic | (3) Target drug that kills or slows down bacteria |
| (d) Chronic health condition | (4) Long-lasting illness that causes structural strain |
✅ Correct Answer
Concept Explanation
Inflammation is a protective response that causes localized swelling and pain. The immune system is our body's defense network. Antibiotics are medications used to clear bacterial infections, and chronic diseases are long-term conditions that develop slowly.
Which of the following statement sets are correct regarding the nature and properties of chronic diseases? - (i) They persist inside the host organism for extended durations
- (ii) They can drastically compromise an individual's general long-term health
- (iii) They always spread within communities through skin contact
- (iv) They can severely reduce a patient's long-term ability to work
✅ Correct Answer
Concept Explanation
Chronic diseases develop slowly and persist over long periods. Because they damage tissues continuously, they have an impact on long-term health and can impair an individual's working capacity. Statement (iii) is false because many chronic conditions (like cancer, diabetes, or heart disease) are non-infectious and cannot spread through physical contact.
Match the pathogen group in Column I with its appropriate disease example listed in Column II:
| Column I | Column II |
|---|---|
| (a) Viral pathogen | (1) Vector-borne Dengue fever |
| (b) Bacterial pathogen | (2) Chronic Pulmonary Tuberculosis |
| (c) Protozoan pathogen | (3) Tissue-destroying Kala-azar |
| (d) Parasitic roundworm | (4) Lymphatic elephantiasis |
✅ Correct Answer
Concept Explanation
Dengue is caused by a virus. Tuberculosis is caused by a bacterium. Kala-azar (visceral leishmaniasis) is caused by the protozoan *Leishmania*, and elephantiasis is caused by parasitic filarial roundworms that block lymphatic vessels.
Match the historical vaccination milestones in Column I with their entries in Column II:
| Column I | Column II |
|---|---|
| (a) Smallpox disease | (1) The first deadly human disease to be completely eradicated by vaccination |
| (b) Dr. Edward Jenner | (2) Historic English physician who developed the first vaccine |
| (c) Vaccination concept | (3) Derived from the Latin word *vacca*, meaning cow |
| (d) Cowpox virus | (4) A mild disease that provided immunity against smallpox |
✅ Correct Answer
Concept Explanation
Smallpox was a deadly disease that was eradicated globally through vaccination campaigns. In 1796, Edward Jenner observed that milkmaids who contracted mild cowpox infections became immune to smallpox, which laid the foundation for modern immunization techniques.
Which of the following listed choices represent effective general methods used to prevent the spread of infectious diseases? - (i) Maintaining clean public hygiene and sanitation systems
- (ii) Ensuring access to safe, treated drinking water
- (iii) Implementing immunization and vaccination programs
- (iv) Ignoring minor symptoms during initial infection stages
✅ Correct Answer
Concept Explanation
Preventing disease transmission requires public and personal interventions: proper waste management blocks vectors, clean water stops waterborne bacteria, and vaccination builds immune memory cells. Ignoring early warning signs—statement (iv)—allows a pathogen to multiply and spread through a community.
Match the health protection mechanism in Column I with its precise preventative outcome in Column II:
| Column I | Column II |
|---|---|
| (a) Safe drinking water | (1) Blocks the transmission of waterborne pathogens like cholera |
| (b) Balanced daily diet | (2) Supplies nutrients to maintain a strong immune system |
| (c) Public sanitation | (3) Lowers general exposure to vectors and environmental microbes |
| (d) Clinical Immunisation | (4) Provides specific, targeted protection against a pathogen |
✅ Correct Answer
Concept Explanation
This matching question outlines the general and specific principles of prevention:
1. Safe drinking water treats and removes biological pathogens to halt waterborne diseases like cholera.
2. A balanced daily diet supplies essential macronutrients and vitamins required to keep your body's base cellular immunity functioning at peak capacity.
3. Public sanitation systems remove waste heaps and stagnant water to lower everyone's general exposure to vectors like mosquitoes and flies.
4. Immunisation introduces safe mimics of a pathogen to trick your immune system into making highly specific antibodies and memory cells for targeted long-term protection.
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SEBA Class 9 Science Chapter 13 Why Do We Fall Ill MCQs – Important Objective Questions
A strong understanding of Why Do We Fall Ill is essential not only for scoring well in examinations but also for building awareness about health and disease prevention. Practicing MCQs based on the latest SEBA (ASSEB) syllabus helps students revise important concepts effectively and become familiar with the pattern of objective questions asked in exams.
These SEBA Class 9 Science Chapter 13 MCQs cover key areas such as types of diseases, causes of infectious and non-infectious diseases, role of vectors like mosquitoes, methods of prevention, vaccination, and basic principles of treatment. Regular practice of these topics enables students to clearly differentiate between concepts and avoid confusion during exams.
Solving such important objective questions for Class 9 Science also improves analytical thinking and helps students apply their knowledge to real-life situations related to health and hygiene. Questions based on disease control and public health become easier to understand when practiced through exam-oriented MCQs.
Consistent revision through MCQs enhances accuracy and confidence, allowing students to answer quickly and correctly under exam conditions. It also supports quick recap before tests, making preparation more structured and effective.
To achieve better results in school exams and board-based assessments, students should make these MCQs a regular part of their study routine. With proper understanding and continuous practice, this chapter can be scored easily while also gaining valuable knowledge about maintaining good health.
FAQs – SEBA Class 9 Science Chapter 13 Why Do We Fall Ill MCQs
1. How many MCQs come from Why Do We Fall Ill in SEBA Class 9 exam?
Usually 3–5 MCQs appear, but ASSEB guidelines mention up to 45 MCQs overall. Focus on definitions and disease types for better scoring.
2. Which are the most important MCQs from Chapter 13 Why Do We Fall Ill?
Questions on infectious vs non-infectious diseases, immunity, and antibiotics are most important. Revise NCERT examples carefully—they are often repeated.
3. Is Why Do We Fall Ill chapter difficult for Class 9 SEBA students?
No, it’s easy if you understand concepts clearly. Focus on keywords like pathogens and prevention methods instead of memorizing blindly.
4. Where can I download SEBA Class 9 Why Do We Fall Ill MCQs PDF?
You can find chapter-wise MCQs PDFs on Assam Eduverse and similar sites. Always practice from updated ASSEB pattern-based question sets.
5. How to prepare MCQs for Why Do We Fall Ill quickly before exam?
Start with NCERT line-by-line reading, then solve MCQs daily. Focus more on concepts like transmission and prevention—they come frequently.
6. Are NCERT-based MCQs enough for SEBA Class 9 Chapter 13 exams?
Yes, mostly NCERT-based MCQs are asked. But practicing extra MCQs from Assam Eduverse helps you handle tricky and application-based questions confidently.
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