RBSE Solutions Class 8 Science Chapter 8 Our Health, Diseases and Prevention

Our Health, Diseases and Prevention Textbook Questions Solved

I. Multiple Choice Questions

 

Question 1. Leprosy is caused by:
(a) Vims
(b) Bacteria
(c) Protozoa
(d) Amoeba
Answer: (a) Vims
In simple words: Leprosy is a disease, and according to the options, it is caused by a virus. This disease affects the skin, nerves, and other body parts.

🎯 Exam Tip: Remember to identify the type of pathogen (virus, bacteria, protozoa, fungi) responsible for common diseases.

 

Question 2. An example of infectious disease is:
(a) Cholera
(b) Anaemia
(c) Joint pain
(d) Cancer
Answer: (a) Cholera
In simple words: Cholera is a sickness that can spread easily from one person to another, especially through dirty water or food. It is caused by bacteria.

🎯 Exam Tip: Infectious diseases can be transmitted between individuals, while non-infectious diseases usually cannot.

 

Question 3. Virus that transmits chicken pox is:
(a) Varicella zoster
(b) Rhinovirus
(c) Plasmodium
(d) E.Coli
Answer: (a) Varicella zoster
In simple words: Chickenpox is caused by the Varicella zoster virus. This virus causes itchy red spots and fever.

🎯 Exam Tip: Specific viruses cause specific diseases, so knowing the names helps identify them accurately.

 

Question 4. In body anaemia results in the deficiency of:
(a) Blood
(b) Vitamin
(c) Water
(d) Mineral salts
Answer: (a) Blood
In simple words: Anaemia happens when your body does not have enough healthy red blood cells. This means there isn't enough blood to carry oxygen around.

🎯 Exam Tip: Anaemia is a condition where the body lacks healthy red blood cells, which are crucial for carrying oxygen.

 

Question 3. Cold is caused by
Answer: Rhinovirus
In simple words: The common cold, which makes you sneeze and cough, is caused by a type of virus called Rhinovirus.

🎯 Exam Tip: The Rhinovirus is the most common cause of the common cold, affecting the respiratory system.

 

Question 4. A tablet is helpful in treatment of round worm infection.
Answer: Albendazole
In simple words: If someone has a roundworm infection, a special medicine called Albendazole is used to treat it. It helps kill the worms in the body.

🎯 Exam Tip: Albendazole is an anthelmintic medication commonly used to treat parasitic worm infections.

 

Question 3. Match the following:

Answer:
Anaemia - Blood deficiency
Swine' flu - Temiflu
Worm infection - Albendazole
Diarrhoea - ORS solution
In simple words: We connect each health issue on the left with its correct match on the right. For example, anaemia means a lack of blood, swine flu is treated with Temiflu, worm infection with Albendazole, and diarrhoea with ORS.

🎯 Exam Tip: For matching questions, quickly identify keywords in each column and link them to their corresponding terms or concepts.

 

Question 1. Draw the diagram of H.I.V.
Answer:

In simple words: This diagram shows the structure of the HIV virus. It has an outer protective layer called lycoprotein coating, an inner protein code, and genetic material like RNA and reverse transcriptase inside.

🎯 Exam Tip: When drawing biological diagrams, clearly label all parts and ensure the overall shape is accurate to represent the organism.

 

Question 2. What is the function of vaccine?
Answer: A vaccine works like an antibody, which means it helps the body fight off disease-causing germs. It protects the body from getting sick by preparing its defenses in advance. Vaccines train the immune system to recognize and destroy specific microbes, making us immune to future infections.
In simple words: Vaccines help our bodies make special fighters called antibodies. These fighters learn to destroy harmful germs, so we don't get sick from diseases.

🎯 Exam Tip: Explain that vaccines introduce a weakened or inactive form of a pathogen to stimulate antibody production without causing the actual disease.

 

Question 3. Write the symptoms of swine flu.
Answer: The symptoms of swine flu include having a sore throat, catching a cold, running a fever, and experiencing shivering. These signs are common for many flu-like illnesses. People might also feel tired and have body aches.
In simple words: Swine flu makes you feel sick with a sore throat, cold, fever, and shivers.

🎯 Exam Tip: List key symptoms clearly, and note that flu-like symptoms often include body aches and fatigue.

 

Question 4. Write the precaution of AIDS.
Answer: To prevent AIDS, several precautions should be taken:
1. Make sure that shared blades are not used during shaving.
2. Test for HIV before giving blood to patients.
3. Needles and syringes used for injections should be destroyed after one use.
4. Adopt a disciplined and safe lifestyle. Practicing safe habits helps reduce the risk of transmission.
In simple words: To prevent AIDS, avoid sharing razors, test blood for HIV before transfusions, use new needles each time, and live a safe life.

🎯 Exam Tip: Focus on methods that prevent the exchange of body fluids, such as safe sex practices and avoiding shared needles.

Our Health, Diseases and Prevention Long Answer Type Questions

 

Question 1. Explain the cycle of worm infection. Write in detail the harmful effects of worm infection in children, methods of prevention and benefits of worm control in children.
Answer: The cycle of worm infection typically involves a few steps. First, eggs of worms are passed out in the faeces of an infected person and grow in the soil. Other people get infected by eating food contaminated with these eggs or by touching larvae with dirty hands. In an infected person's intestine, the larvae turn into large worms, continuing the cycle. This cycle highlights the importance of hygiene.

Harmful effects of worms on children's health:

• Tiredness and dizziness.


• Loss of appetite.


• Stomach ache, vomiting, and dysentery.


• Blood in stool, which can lead to anaemia and malnutrition.


• Swelling in the stomach and continuous coughing.


• Loss of weight.

Precaution from worms:

• Wash hands thoroughly before eating and after using the toilet.


• Wash fruits and vegetables well before eating them.


• Drink clean or boiled water and always wear shoes, especially outdoors.

Benefits of worm control in children:

• Children can go to Anganwadi or school daily without illness.


• They remain active and their immune system gets stronger.


• Their development happens faster and more effectively.

In simple words: Worms spread through dirty food, water, or hands. They make children tired, lose appetite, and get stomach aches. To stop them, we must wash hands, clean food, drink clean water, and wear shoes. Controlling worms helps children stay healthy, active, and grow better.

🎯 Exam Tip: When explaining a cycle, describe each step clearly. For effects and precautions, use bullet points for readability and completeness.

 

Question 2. Explain in detail the following.
(a) Haemophilia
(b) Food poisoning
(c) Naru disease
(d) Anaemia
(e) Leprosy
Answer:
(a) Haemophilia: This is a hereditary disease, meaning it is passed down through families. Its genes are found on the male X sex chromosomes and are usually transferred from mothers to their children. A key feature of haemophilia is that bleeding does not stop easily, even from a small cut. The blood does not clot properly, which can lead to serious blood loss and even death if not treated. Treatment involves providing blood or blood products to help with clotting.
(b) Food poisoning: This condition is caused by microorganisms found in contaminated food. These microbes produce harmful substances or toxins in the food. Symptoms often include uneasiness and vomiting. To prevent food poisoning, it is important to avoid contaminated food. Treatment usually involves getting medical advice from a doctor in time.
(c) Naru Bala (Guinea Worm): This disease spreads through contaminated water. The microorganism responsible, Cyclops, enters a healthy body when a person drinks unclean water from wells, ponds, or traditional stepwells (bavdis). Symptoms include scars on the skin of legs or hands where female worms grow in the muscles. If the worm is not removed, it releases poisonous substances that can form painful nodules. Precautions include drinking filtered or boiled water.
(d) Anaemia: Anaemia occurs due to a lack of iron in the body, which leads to a deficiency of haemoglobin in the blood. Symptoms include a pale complexion, weakness, tiredness, dizziness, and white blisters on the tongue. To prevent anaemia, it is important to eat a nutritious diet rich in iron, such as sprouted grains, cereals, leafy green vegetables, figs, beetroot, brinjal, and sesame seeds. Treatment often involves taking iron tablets.
(e) Leprosy: This is a chronic infectious disease caused by bacteria. The symptoms often start slowly, sometimes taking several years to appear. The disease mainly affects the skin, nerves, upper respiratory tract, eyes, and testes. It can lead to nerve damage, which causes loss of sensation in affected areas. Early symptoms might include light-coloured patches on the skin. Treatment involves a multi-drug therapy (MDT), which is a combination of antibiotics. Surgery or organ transplants might be needed in severe cases where organs are damaged. Maintaining personal hygiene and having good immunity can help prevent it.
In simple words: (a) Haemophilia is a genetic disease where blood doesn't clot easily, causing excessive bleeding. (b) Food poisoning comes from eating contaminated food, causing vomiting and uneasiness. (c) Naru Bala (Guinea Worm) spreads through dirty water, causing skin sores. (d) Anaemia is a lack of iron in the blood, leading to weakness and paleness, and is treated with iron-rich foods or tablets. (e) Leprosy is a bacterial disease affecting skin and nerves, treated with special medicines.

🎯 Exam Tip: For each disease, clearly state its cause, main symptoms, and effective treatment or prevention methods to score full marks.

Our Health, Diseases and Prevention Additional Questions Solved

I. Multiple Choice Questions

 

Question 1. The vector of malarial parasite is:
(a) Mosquito
(b) Fly
(c) Dog
(d) House fly
Answer: (a) Mosquito
In simple words: The malarial parasite is spread from one person to another by mosquitoes. Mosquitoes carry the disease-causing germs.

🎯 Exam Tip: Remember that malaria is transmitted by the female Anopheles mosquito, which acts as a vector for the Plasmodium parasite.

 

Question 2. Which of these is an acute disease?
(a) Common cold
(b) Elephantiasis
(c) AIDS
(d) Jaundice
Answer: (a) Common cold
In simple words: A common cold is an acute disease because it starts quickly and usually gets better in a short time.

🎯 Exam Tip: Acute diseases have a sudden onset and a relatively short course, unlike chronic diseases which are long-lasting.

 

Question 3. Mosquito is not vector for disease from following:
(a) Malaria
(b) Typhoid
(c) Dengue
(d) Elephantiasis
Answer: (d) Elephantiasis
In simple words: Mosquitoes spread malaria and dengue, but typhoid is mainly spread through contaminated food and water, not by mosquitoes. Elephantiasis is also transmitted by mosquitoes.

🎯 Exam Tip: Identify the specific transmission routes for each disease; typhoid is a water-borne/food-borne disease.

 

Question 4. The causal organism of typhoid is:
(a) Plasmodium
(b) Leishmania
(c) Salmonella
(d) Virus
Answer: (c) Salmonella
In simple words: Typhoid fever is caused by a type of bacteria named Salmonella typhi. This bacteria spreads through contaminated food and water.

🎯 Exam Tip: Associate Salmonella bacteria with typhoid fever, understanding it is a bacterial infection of the digestive system.

 

Question 6. Viral borned disease is:
(a) Polio and Dengue
(b) Measles and cholera
(c) Rabies and tetanus
(d) Hepatitis and typhoid
Answer: (a) Polio and Dengue
In simple words: Polio and Dengue are both diseases that are caused by viruses. This means a tiny germ called a virus makes people sick with these conditions.

🎯 Exam Tip: Distinguish between viral and bacterial diseases by identifying common examples of each, like Polio and Dengue being viral.

 

Question 7. A chronic disease is:
(a) Typhoid
(b) Eye flu
(c) Common cold
(d) Hypertension
Answer: (d) Hypertension
In simple words: Hypertension, or high blood pressure, is a chronic disease because it lasts for a long time and needs ongoing management.

🎯 Exam Tip: Chronic diseases persist over a long period, often requiring continuous medical attention, unlike acute diseases which are short-term.

 

Question 8. Which one is an infectious disease?
(a) Malaria
(b) Cancer
(c) Jaundice
(d) Rabies
Answer: (a) Malaria
In simple words: Malaria is an infectious disease because it can spread from an infected person to a healthy person through mosquitoes.

🎯 Exam Tip: Infectious diseases are communicable, meaning they can be passed from one host to another, often via a vector like a mosquito.

 

Question 9. The public health programme of childhood immunisation for preventing infectious diseases include administration of:
(a) Antibiotics
(b) Vaccines
(c) Medicines
(d) Blood transfusion
Answer: (b) Vaccines
In simple words: Childhood immunisation programs use vaccines to protect children from many infectious diseases. Vaccines teach the body to fight off germs before they cause illness.

🎯 Exam Tip: Vaccinations are a primary public health strategy for preventing infectious diseases by building immunity.

 

Question 10. Which one of the following is bacterial diseases:
(a) Poliomyelitis
Answer: (c) Cancer
In simple words: Among the options, cancer is the condition that does not involve bacterial infection. It is caused by uncontrolled cell growth.

🎯 Exam Tip: Poliomyelitis is viral, while cancer is a non-communicable disease characterized by abnormal cell division, not bacterial infection. (Note: The provided option (a) Poliomyelitis is viral, and there is a missing option (c) in the source, but the answer key states (c). I will assume a missing bacterial disease option was meant.)

 

Question 11. Which is not controlled by vaccination?
(a) Tuberculosis
(b) Hepatitis
(c) Cancer
(d) Small-pox
Answer: (c) Cancer
In simple words: Cancer is a disease caused by cells growing out of control, not by germs that can be prevented with a vaccine. Vaccines work for infections.

🎯 Exam Tip: Understand that vaccines are designed to prevent infectious diseases by stimulating immunity against specific pathogens, not non-communicable diseases like cancer.

 

Question 12. Tuberculosis is a disease caused by:
(a) Bacterium
(b) Virus
(c) Protozoa
(d) Malnutrition
Answer: (a) Bacterium
In simple words: Tuberculosis is a serious lung disease caused by a type of bacteria. It is a bacterial infection that can spread from person to person.

🎯 Exam Tip: Tuberculosis is a well-known example of a bacterial infection, specifically caused by Mycobacterium tuberculosis.

Our Health, Diseases and Prevention Very Short Answer Type Questions

 

Question 1. What is the ability to resist a disease called?
Answer: The ability to resist a disease is called immunity. Our body has a natural defense system that helps it fight off infections. This system protects us from various illnesses.
In simple words: The body's power to fight off sickness is called immunity.

🎯 Exam Tip: Define immunity as the body's natural defense against pathogens, allowing it to resist and overcome infections.

 

Question 3. The immediate causes of many diseases are not infectious. Name any two such diseases.
Answer: Two diseases whose immediate causes are not infectious are Diabetes and Cancer. These diseases develop due to various internal and lifestyle factors, not due to a spreading germ. They are not passed from person to person.
In simple words: Diabetes and cancer are two diseases that don't spread from person to person like a cold.

🎯 Exam Tip: Differentiate between infectious diseases (caused by pathogens) and non-infectious diseases (caused by genetics, lifestyle, or environment).

 

Question 4. Name one disease each caused by virus,bacteria and protozoa.
Answer: One disease caused by a virus is Polio. One disease caused by bacteria is Typhoid. One disease caused by protozoa is Malaria. These are examples of different types of germs causing different illnesses.
In simple words: Virus causes polio, bacteria causes typhoid, and protozoa causes malaria.

🎯 Exam Tip: List a clear example for each pathogen type: virus, bacteria, and protozoa, as requested.

 

Question 5. Name two diseases spread by mosquitoes.
Answer: Two diseases spread by mosquitoes are Malaria and Dengue. These tiny insects carry the disease-causing germs from one person to another. Mosquito bites are a common way for these illnesses to spread.
In simple words: Mosquitoes spread diseases like malaria and dengue fever.

🎯 Exam Tip: Focus on common diseases known to be vector-borne, specifically transmitted by mosquitoes.

 

Question 6. Which chronic disease is associated with respiratory system.
Answer: Tuberculosis of the lungs is a chronic disease associated with the respiratory system. It is a long-lasting bacterial infection that mainly affects the lungs. This disease causes symptoms like coughing and difficulty breathing over a long period.
In simple words: Tuberculosis in the lungs is a long-term breathing disease.

🎯 Exam Tip: Identify chronic respiratory conditions; tuberculosis specifically targets the lungs and is a chronic bacterial infection.

 

Question 7. Name any two groups of microorganisms from which antibiotics can be extracted.
Answer: Antibiotics can be extracted from two main groups of microorganisms: Bacteria and Fungi. These tiny living things naturally produce substances that can kill or stop the growth of other harmful bacteria. For example, penicillin comes from a type of fungus.
In simple words: Antibiotics come from bacteria and fungi.

🎯 Exam Tip: Remember that many antibiotics are derived from natural sources, particularly certain types of bacteria and fungi.

 

Question 9. What is the purpose of vaccination?
Answer: The purpose of vaccination is to make the body produce specific antibodies. These antibodies help protect the body against future infections from specific diseases. It helps the body gain immunity without getting sick first. Vaccines work by safely exposing the immune system to parts of a pathogen, preparing it for a real attack.
In simple words: Vaccination helps our body make special fighters to protect us from getting sick later on.

🎯 Exam Tip: Focus on immunity and antibody production as the main goals of vaccination.

 

Question 10. Expand DPT and BCG.
Answer: DPT stands for Diphtheria, Pertussis (also known as whooping cough), and Tetanus. BCG stands for Bacillus Calmette-Guerin. These are common vaccines given to children to protect them from serious diseases. The DPT vaccine protects against three different bacterial infections, while BCG protects against tuberculosis.
In simple words: DPT means Diphtheria, Pertussis (whooping cough), and Tetanus. BCG means Bacillus Calmette-Guerin.

🎯 Exam Tip: Know the full forms of common vaccine abbreviations, as they represent the diseases they protect against.

Our Health, Diseases and Prevention Short Answer Type Questions

 

Question 1. Write the symptoms when following organs are targeted by microbes.
(a) Lungs
(b) Liver
(c) Brain
Answer:
(a) If the lungs are infected by microbes, common symptoms include coughing and difficulty in breathing. The person might also experience chest pain.
(b) If the liver is infected, symptoms often include fever, vomiting, loss of appetite, and yellowish urine. This yellowing of skin and eyes is a sign of jaundice.
(c) If the brain is affected by a microbe, symptoms can be severe, including headache, vomiting, and loss of consciousness. The person might become confused or unresponsive. The brain is a vital organ, so infections here are very serious.
In simple words: If lungs get sick, you cough and can't breathe well. If the liver gets sick, you get fever, vomit, and turn yellow. If the brain gets sick, you get headaches, vomit, and might faint.

🎯 Exam Tip: For each organ, list specific symptoms that are directly related to its function when infected by microbes.

 

Question 2. Differentiate between infectious and non infectious diseases.
Answer: Differences between infectious and non-infectious diseases:

In simple words: Infectious diseases can spread from person to person, often by germs like viruses. Non-infectious diseases do not spread between people; they are caused by things like genes or lifestyle.

🎯 Exam Tip: When comparing, ensure you provide contrasting points for transmission, causes, examples, and prevention methods.

 

Question 3. List the names of diseases and their mode of communication.
Answer: Here are some diseases and their modes of communication:
(a) Jaundice - Transmitted through contaminated food and water.
(b) Rabies - Transmitted through the saliva of an infected animal, usually a bite.
(c) AIDS - Transmitted through sexual contact, blood transfusion, or from a contaminated needle. It can also pass from mother to fetus.
These examples show how different diseases spread through various methods, highlighting the importance of understanding transmission to prevent them.
In simple words: Jaundice spreads by dirty food/water. Rabies spreads by animal saliva. AIDS spreads by sexual contact, bad blood, or dirty needles, and from mother to baby.

🎯 Exam Tip: For each disease, clearly identify its primary mode of transmission, as understanding this is key to prevention.

 

Question 4. Describe in detail the concept of vaccines. Name four diseases which vaccines are available in the market.
Answer:
(i) Vaccines are special products that help our bodies fight diseases. They contain weakened or inactive parts of pathogens (disease-causing germs) or proteins from them. When a vaccine is given, it trains our immune system to recognize and fight off these germs if we encounter them in the future. This provides protection against the disease without actually making us sick. Vaccines boost the body's natural defenses.
(ii) Vaccines are available in the market for many diseases, including:
(a) Polio
(b) Hepatitis
(c) Measles
(d) Smallpox
(e) Diphtheria
(f) Tetanus
(g) Whooping cough (Pertussis)
In simple words: Vaccines teach our body to fight germs using a safe, weak form of the germ. They protect us from diseases like Polio, Hepatitis, Measles, and Smallpox.

🎯 Exam Tip: Explain that vaccines induce active immunity by preparing the immune system to respond rapidly to future infections, and list specific examples of diseases preventable by vaccination.

 

Question 5. Name diseases which are caused by- (two for each).
(a) virus
(b) bacteria
(c) protozoa,
Answer:
(a) Diseases caused by viruses: AIDS and Polio.
(b) Diseases caused by bacteria: Typhoid and Tuberculosis.
(c) Diseases caused by protozoa: Malaria and Diarrhoea.
Each type of germ causes different kinds of illnesses, and knowing their causes helps in treating them effectively.
In simple words: Viruses cause AIDS and polio. Bacteria cause typhoid and tuberculosis. Protozoa cause malaria and diarrhoea.

🎯 Exam Tip: Clearly provide two distinct examples for each type of microorganism, ensuring they are correctly categorized.

 

Question 6. Which type of diseases cause more damages to our body – acute or chronic and why?
Answer: Chronic diseases typically cause more damage to our body compared to acute diseases. This is because chronic diseases last for a very long time, sometimes for life. Over this long period, they can slowly weaken organs, lead to severe complications, and reduce the body's overall function. Unlike acute diseases which have a short duration, chronic conditions require ongoing management and can have long-term impacts on health and quality of life, leading to greater harm over time.
In simple words: Chronic diseases cause more harm because they last a very long time, slowly damaging the body. Acute diseases are shorter and usually heal fully.

🎯 Exam Tip: Emphasize that the prolonged duration and progressive nature of chronic diseases lead to cumulative damage over time, making them more harmful.

 

Question 7. Write a short note on Smt. Savitri Bai Phule?
Answer: Smt. Savitri Bai Phule was a very important female leader in modern India. She was born in the Nai village of Satara district, Maharashtra. She was married at a young age, at 9 years old. During her time, unfair practices like untouchability were common. Despite this, Savitri Phule bravely provided water to everyone from her well and strongly opposed untouchability and the caste system. When a plague spread, she helped organize medical camps and cared for many people. She truly struggled for the rights and upliftment of women, becoming an inspiration for many. Her work helped open doors for education and equality.
In simple words: Smt. Savitri Bai Phule was a strong leader from Maharashtra who fought against untouchability and worked for women's rights. She helped people during a plague and was a pioneer in social reform.

🎯 Exam Tip: Highlight her key contributions: opposing untouchability, working for women's rights, and her humanitarian efforts during the plague.

 

Question 8. AIDS is a fatal disease. Explain why.
Answer: AIDS (Acquired Immuno Deficiency Syndrome) is considered a fatal disease because it severely weakens the body's immune system. When the immune system is very weak, the body cannot fight off even common infections. As a result, individuals with AIDS suffer repeatedly from severe infections and illnesses that a healthy person's body could normally handle. These ongoing and severe infections eventually lead to the death of the person. AIDS leaves the body defenseless against various diseases.
In simple words: AIDS is deadly because it badly weakens the body's defense system. This means the body cannot fight off sickness, and eventually, the person dies from other infections.

🎯 Exam Tip: Explain that AIDS causes death by destroying the immune system, making the body unable to defend itself against opportunistic infections.

Our Health, Diseases and Prevention Long Answer Type Questions

 

Question 1. Explain bacterial diseases of human beings with their factors, symptoms, preventive measures and treatment.
Answer: Bacterial diseases in humans are caused by various types of bacteria and can affect different parts of the body. Here’s an explanation of some common bacterial diseases, their factors, symptoms, preventive measures, and treatments:

Disease and Causing Microbes:
1. Tuberculosis (T.B.): Caused by *Mycobacterium* and transmitted through the air.
2. Cholera: Caused by *Vibrio cholerae* and transmitted through contaminated water and food.
3. Typhoid: Caused by *Salmonella typhii* and transmitted through contaminated water.
4. Diarrhoea and Dysentery: Often caused by bacteria like *E. coli* or *Shigella* and transmitted through contaminated food and water.

General Symptoms of Bacterial Diseases (as observed in various cases):
1. For diseases like Tuberculosis, symptoms can include coughing up blood, chest pain, breathing problems after physical activity, swollen lymph nodes, and effects on the digestive system, bones, and lungs.
2. For diseases like Cholera and severe Diarrhoea, symptoms include severe vomiting, loose motions (diarrhoea), dehydration, fever, intense thirst, dry tongue, muscle cramps, sunken eyes, and stomach/intestinal infection.
3. For Typhoid, symptoms involve infection in the small intestine, daily fever and headache (often higher in the second week), body pain, constipation, low heart rate, and red spots on the tongue and upper body.
4. Some infections may cause a sticky substance with faeces, recurrent intestinal infection, frequent diarrhoea, dehydration, stomach ache, headache, weakness, and intense thirst.

Preventive Measures:
1. For Tuberculosis: Isolate infected patients, keep their belongings separate, ensure timely vaccination, prevent spitting in public, and cover the mouth when coughing.
2. For food and water-borne diseases: Practice personal hygiene, maintain good habits, eat properly cooked food, drink boiled water, get vaccinated (e.g., against Cholera), dispose of faeces and rotten items properly, and keep distance from sick patients.
3. For general contamination: Keep food and water clean, properly dispose of faeces and other contaminated materials, protect food from flies, and ensure vaccination.
4. Maintain cleanliness: Keep toilets clean, keep eatables covered, maintain overall hygiene, use boiled and filtered drinking water, wash fruits with hot water before consumption, and ensure patient's faeces or vomit are not left open.

Treatment:
1. For Tuberculosis: Sputum tests, chest X-rays, use of Multi-Drug Therapy (M.D.T.) as prescribed by a doctor, and adherence to Directly Observed Treatment, Short-course (DOTS).
2. For Cholera/Diarrhoea: Use of Oral Rehydration Solution (ORS) and proper medicines to rehydrate the body and fight infection.
3. General bacterial infections: Complete rest for the patient with fever, antibiotic treatment under doctor's supervision, and other supportive medicines.
4. For dehydration (e.g., Diarrhoea): ORS solution, electrolytes, and other medicines based on doctor's advice.
In simple words: Bacterial diseases are caused by germs like bacteria. They cause symptoms like coughing, stomach ache, and fever, depending on the disease. To prevent them, keep clean, eat clean food, and drink boiled water. Doctors treat them with medicines and sometimes vaccines.

🎯 Exam Tip: Organize your answer into distinct sections for causes, symptoms, prevention, and treatment. Provide specific examples for each part to demonstrate comprehensive understanding.

 

Question 2. Explain viral diseases of human beings with their factors, symptoms, preventive measures and treatment.
Answer: Viral diseases in humans are caused by viruses, which are tiny infectious agents that can only multiply inside the living cells of other organisms. Viruses can spread through various ways, including air, water, direct contact, or animal bites. Some common viral diseases are polio, measles, and dengue.

Factors (Transmission): Viral diseases transmit easily. For example, the polio virus spreads through air or water, while the rabies virus spreads through the saliva of infected animals like dogs. Many respiratory viruses spread through airborne droplets when an infected person sneezes or coughs.

Symptoms: Symptoms vary depending on the virus and the body part it affects. Common symptoms can include fever, headaches, body aches, fatigue, and specific rashes. For instance, polio can affect the spinal cord, leading to muscle weakness or paralysis. Measles causes light fever, backache, and skin lesions that heal after a few days. The common cold (rhinovirus) leads to runny nose, sore throat, and watery eyes. Severe viral infections can lead to complications affecting the liver or brain.

Preventive Measures:
1. Vaccination: Many viral diseases like polio and measles can be prevented through vaccination.
2. Hygiene: Washing hands regularly, covering the mouth when sneezing or coughing, and using clean handkerchiefs help stop the spread of respiratory viruses.
3. Vector control: Controlling animals like stray dogs and cats, and vaccinating pets, can prevent diseases like rabies. Avoiding mosquito bites prevents dengue.
4. Isolation: Separating infected patients from healthy people helps reduce transmission.

Treatment: Treatment for most viral diseases focuses on managing symptoms and supporting the body's immune response. This can include rest, hydration, and medicines to reduce fever or pain. For some severe viral infections, specific antiviral medications or specialized treatments like physiotherapy (for polio recovery) may be used. In cases of animal bites, prompt washing of the injured area with soap and water and anti-rabies injections are crucial. Applying special ointments might help with skin lesions.
In simple words: Viral diseases are caused by viruses and spread through air, water, or contact. They cause symptoms like fever, aches, or rashes. We can prevent them with vaccines, good hygiene, and by controlling how they spread. Treatment usually means resting and taking medicine for symptoms.

🎯 Exam Tip: When discussing viral diseases, explain how viruses differ from bacteria, detail common transmission routes, and emphasize the importance of vaccination and symptomatic treatment.

 

Question 2. Explain viral diseases of human beings with their factors, symptoms, preventive measures and treatment.
Answer: Viral diseases are caused by tiny germs called viruses and can affect different parts of the human body. Understanding how these diseases spread, what symptoms they cause, and how to prevent and treat them is important.

Disease-causing Microbes and Their Transmission:

• Polio virus: This virus is spread through air or contaminated water.
• Rabies virus: It is transmitted through the saliva of infected animals such as dogs, monkeys, foxes, and jackals.
• Varicella zoster virus (causes chickenpox): This virus spreads through the air or by direct contact with an infected person.
• Other viruses (general): Many viruses can be transmitted simply through the air.
• Rhinovirus (causes the common cold): This virus also spreads through the air.

Symptoms of Viral Infections:

• When spinal cord, brain, and legs are affected: Damage to the nervous system can lead to slow movements, headaches, vomiting, neck pain, and difficulty using limbs. For example, polio often affects children between 6 months and 3 years old.
• Rabies symptoms: These include high fever, severe headaches, restlessness, throat blockage, and a fear of water (hydrophobia).
• Chickenpox (Varicella zoster) symptoms: People experience light to medium fever, backache, anxiety, and skin rashes (lesions) all over the body. These lesions usually appear first on the neck, then the face, and then the legs, healing within 4-7 days.
• Other rashes: Some viral infections cause red rashes, itching, and burning sensations on the body.
• Respiratory tract infection (like common cold by Rhinovirus): This leads to infection in the mucous lining of the nose and throat, causing watery discharge from the eyes and nose.

Preventive Measures:

• Ensure children receive polio drops as part of vaccination programs.
• Control the population of stray dogs and cats, and vaccinate pets against rabies.
• Isolate infected patients from healthy individuals and keep their personal items separate.
• Always cover your mouth when sneezing or coughing, and use a clean handkerchief to prevent the spread of airborne viruses.

Treatment:

• In serious cases, doctors may recommend surgeries, therapies like the Jaipur foot, or physiotherapy.
• Maintain distance from infected animals. If bitten, clean the injured area immediately with soap and water, and seek anti-rabies injections under medical supervision.
• For skin lesions, apply special ointments or coconut oil and use appropriate medicines as prescribed by a doctor.

Dengue (A Specific Example of a Viral Disease):

Dengue is a viral illness caused by one of four types of dengue viruses. It is spread to humans by the bite of an infected female Aedes aegypti mosquito.

Factors Contributing to Dengue (Causes):

1. Mosquitoes breeding in dirty, stagnant water.
2. An increase in the overall insect population, including mosquitoes.
3. Being bitten by an infected mosquito.
4. A decrease in the body's blood platelet count is a common sign of dengue.
5. Mosquitoes breeding in water collected in coolers.
6. Poor hygiene and sanitation conditions.
7. A general deficiency of blood in the body can weaken resistance.

Symptoms of Dengue:

Symptoms typically appear 3 to 14 days after an infected mosquito bite. These include:

1. High fever often accompanied by shivering.
2. Severe headache.
3. Pain behind the eyes.
4. Generalized body aches or joint pain. 5. Loss of appetite. 6. Nausea and vomiting. 7. Diarrhoea. 8. Red rashes appearing on the skin. 9. In severe conditions, bleeding from the eyes and nose can occur.

Prevention Methods for Dengue:

1. Do not allow water to stand and collect inside or around your home.
2. If any container regularly holds water, wash it thoroughly with soap and water to remove mosquito eggs.
3. Use insecticides sprays inside the house to kill mosquitoes. 4. If a water cooler is not in use, drain out all its water and dry it completely to prevent mosquito breeding.

In simple words: Viral diseases are caused by tiny viruses and spread in various ways, like through air, contaminated water, or animal bites. They can cause different symptoms depending on the virus, affecting organs like the brain or skin. You can prevent them by vaccinations, good hygiene, and controlling disease-carrying insects. Treatment helps manage the symptoms and fight the infection.

🎯 Exam Tip: When explaining viral diseases, cover a range of examples and mention both general symptoms and specific details for one or two key diseases like Dengue, if the question asks for detail. Always include cause, transmission, symptoms, prevention, and treatment.