NCERT Solution for Class 9 Science Chapter 13 Why Do We Fall Ill
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|2. Intext Questions|
NCERT Solution for Class 9 Science Chapter 13 Why Do We Fall Ill? on this step-by-step Why Do We Fall ill? answer guide. In some of State Boards and CBSE schools, students are taught thru NCERT books. As the chapter comes to an end, students are requested few questions in an exercising to evaluate their knowledge of the chapter. Students regularly want guidance dealing with those NCERT Solution for Class 9 Science Chapter 13 Why Do We Fall Ill?
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NCERT Solution for Class 9 Science
Chapter 13 Why Do We Fall Ill?
Q. 1. How many times did you fall ill in the last one year ? What were the illnesses ?
( a ) Think of one change you could make in your habits in order to avoid any of / most of the above illnesses .
( b ) Think of one change you would wish for in your surroundings in order to avoid any of most of the above illnesses .
Ans . I suffered last year from cold and cough ( twice ) and malaria ( once ) .
To avoid any mentioned diseases , one has to change their habit and environment .
( a ) Change of habit :
1. Should avoid the company of persons suffering from cough and cold .
2. Wear proper full clothes during changing season to give protection to the body and also against mosquito bite .
( b ) Change in surroundings :
1. Improve the sanitary conditions in the surroundings .
2. Do not allow water to store near the houses , because it provides the breeding place for mosquitoes .
Q. 2. A doctor / nurse / health worker is exposed to more sick people than others in the community . Find out how she / he avoids getting sick herself / himself .
Ans . A doctor / nurse / health worker is exposed to more sick people than others in the community , still they avoid getting sick themselves because they take care of the following measures . For example ,
( i ) They keep their regularly used equipment sterilised properly .
( ii ) There working area is also sterilised by using phenyl .
( iii ) They always wash their hand with soaps after undergoing a thorough and serious check – up or examination .
( iv ) They get vaccinated or immunised against various diseases .
Q. 3. Conduct a survey in your neighbourhood to find out what the three most common diseases are . Suggest three steps that could be taken by your local authorities to bring down the incidence of these diseases .
Ans . ( i ) Three most common diseases in my locality are diarrhoea , malaria and tuberculosis .
( ii ) The following steps I would suggest to be taken by our local authorities to bring down the incidence of these diseases :
( a ) Organising immunisation or vaccination camps .
( b ) Supply of safe drinking water and preventing incidences of open drains .
( c ) Eradication of mosquitoes and regular cleaning of drains and spraying of insecticides .
( d ) Environment should be cleaned by making them free from garbage and wastes which were thrown in an open area .
Q. 4. A baby is not able to tell her / his caretakers that she / he is sick . What would help us to find out
( i ) that the baby is sick ?
( ii ) what is the sickness ?
Ans . ( i ) Sickness of baby can be judged by the following symptoms :
( a ) Continuous crying and restlessness .
( b ) Improper intake of food and body temperature .
( ii ) Sickness should be diagnosed by observing the symptoms or its severity . It can be known by certain organ and tissue – specific symptoms ( e.g. , yellowness of skin and eyes indicate the jaundice and hepatitis ) .
Q. 5. Under which of the following conditions is a person most likely to fall sick ?
( a ) when she is recovering from malaria .
( b ) when she has recovered from malaria and is taking care of someone suffering from chicken – pox .
( c ) when she is on a four – day fast after recovering from malaria and is taking care of someone suffering from chicken – pox . Why ?
Ans . ( c ) A person is most likely to fall sick when she is on a four – day fast after recovering from malaria and is taking care of someone suffering from chicken – pox .
Because during her fast she was on a limited diet and didn’t get sufficient nourishment hence her health condition is poor and does not allowed her to do take care of a sick person .
Q. 6. Under which of the following conditions are you most likely to fall sick ?
( a ) when you are taking examinations .
( b ) when you have travelled by bus and train for two days .
( c ) when your friend is suffering from measles . Why ?
Ans . ( c ) We are most likely to fall sick when a friend suffering from measles .
Because measles is an infectious viral disease that can spread easily from one person to another .
It causes fever and red rashes all over the body .
Q. 1. State any two conditions essential for good health . [ NCERT Q. 1 , Page 178 ]
Ans . ( i ) Health is a condition of human being in which he is free from any illness and is feeling well .
( ii ) Conditions essential for good health are :
( a ) Balanced and nutritious diet .
( b ) Social and healthy environment .
Q. 2. State any two conditions essential for being free of disease . [ NCERT Q. 2 , Page 178 ]
Ans . Conditions essential for being free of disease are :
( i ) Taking balanced and nutritious diet .
( ii ) Living in a good , social , clean and healthy environment .
Q. 3. Are the answers to the above questions ( Q. 1 and Q. 2 ) necessarily the same or different ? Why ? [ NCERT Q. 3 , Page 178 ]
Ans . ( i ) The answer to the above questions ( Q. 1 and Q. 2 ) is same to some extent . Because if the conditions that are essential for good health are maintained then automatically the chances of getting disease will be minimised .
( ii ) But at the same time , the answers are different because good health means the state of good physical , mental and emotional well – being whereas disease fee means not suffering from any disease .
Q. 4. List any three reasons why you would think that you are sick and ought to see a doctor . If only one of these symptoms were present , would you still go to the doctor ? Why or why not ? [ NCERT Q. 1 , Page 180 ]
Ans . ( i ) Common symptoms will make us to feel sick and make us think to see a doctor are :
( a ) Cold and cough
( b ) Loose motion
( c ) Fever
( d ) Headache
( ii ) Moreover , it depends on the type of symptoms also . Because few symptoms , like headache or cold , do not have much effect on our daily life routine or our general health .
( iii ) However , if anyone symptoms persist for more than 2-3 days then definitely we should visit to doctor for its further investigation and proper treatment .
Q. 5. In which of the following case do you think the long – term effects on your health are likely to be most unpleasant ?
( i ) if you get jaundice .
( ii ) if you get lice .
( iii ) if you get acne . Why ? [ NCERT Q. 2 , Page 180 ]
Ans . ( i ) In case of jaundice , the long – term effects on health are likely to be the most unpleasant .
( ii ) Because ,
( a ) Jaundice is a chronic disease and takes long time to be completely cured .
( b ) Moreover , it affects the whole body , especially liver , the most important part of our body .
( iii ) Whereas lice and acne are acute problems of health which can be cured in a short period of time .
Q. 6. Why are we normally advised to take bland and nourishing food when we are sick ? [ NCERT Q. 1 , Page 187 ]
Ans . We are advised to take bland and nourishing food when we are sick because our body needs energy to overcome the infection and the wear and tear of body organ . A nourishing food is easily digestible and contains all the nutrients . So , it provides nutrients to our body that will further provide energy and make new cells .
Q. 7. What are the different means by which infectious diseases are spread ? [ NCERT Q. 2 , Page 187 ]
Ans . ( i ) Infectious disease may occur due to the presence and activity of a pathogenic microbial agent like bacteria , virus and protozoa .
( ii ) It can be spread from one person to another , through the following means :
( a ) Air : Disease transferred from air ( through sneezing and coughing ) is generally called air – borne disease . For example , common cold and pneumonia .
( b ) Water and food : Disease caused due to contaminated food and water is called water – borne disease . It can cause disease like cholera and typhoid .
( c ) Contact : Many diseases spread by contact of infected person with the healthy person . For example , fungal infections , scabies and skin disorder .
( d ) Sexual contact : These are called sexually transmitted diseases , for example , AIDS and syphilis .
( e ) Animals : These are referred to as vectors that spread disease by carrying pathogen from one place to another , for example , mosquitoes are vectors which carry pathogen – like protozoa ( e.g. , Plasmodium sp . ) and causes malaria .
Q. 8. What precautions can you take in your school to reduce the incidence of infectious diseases ? [ NCERT Q. 3 , Page 187 ]
Ans . The precautions you can take in your school to reduce the incidence of infectious diseases are
( i ) Preventing over – crowding classes .
( ii ) Getting vaccinating before the infection affects .
( iii ) Using clean toilets to prevent getting infection from there .
( iv ) Staying at home if anyone suffers from infectious disease .
( v ) Avoiding food which are exposed to flies or mosquitoes .
( vi ) Drinking safe and clean water and washing hands before eating tiffin .
( vii ) Avoid mosquito breeding by preventing water to stagnate in school premises .
( viii ) Using handkerchief while sneezing and coughing to prevent the spreading of infectious disease .
Q. 9. What is immunisation ? [ NCERT Q. 4 , Page 187 ]
Ans . ( i ) Immunisation is a process by which human being is made resistant to diseases or become free from any illnesses .
( ii ) It can be done by giving vaccine for a disease . This vaccine then stimulates the immune system of body to protect against successive infection .
Q. 10. What are the immunisation programmes available at the nearest Health Centre in your locality ? Which of these diseases are the major health problems in your area ? [ NCERT Q. 5 , Page 187 ]
Ans . ( i ) The immunisation programmes available at the nearest Health Centre in our locality are :
( a ) Bacille Calmette – Guérin ( BCG ) vaccine against tuberculosis .
( b ) Polio drops against polio .
( c ) Vaccination against chicken pox .
( d ) Vaccination against hepatitis .
( e ) DP vaccination against diphtheria , pertussis ( whooping cough ) and tetanus .
( f ) Immunisation against measles .
( ii ) The major health problems are hepatitis , tuberculosis , tetanus and chicken pox .
Benefits of NCERT Solution for Class 9 Science Chapter 13 Why Do We Fall Ill?
NCERT Solution for Class 9 Science Chapter 13 Why Do We Fall Ill? contains extremely important points, and for each chapter, each concept has been simplified to make it easier to remember and increase your chances of achieving excellent exam results. Exam Preparation References Here are some tips on how these solutions can help you prepare for the exam.
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