NCERT SOLUTIONS FOR CLASS 9 SCIENCE CHAPTER 13 WHY DO WE FALL ILL

The National Council of Educational Research and Training (NCERT) is an autonomous body of the Indian government that formulates the curricula for schools in India that are governed by the Central Board of Secondary Education (CBSE) and certain state boards. Therefore, students who will be taking the Class 10 tests administered by various boards should consult this NCERT Syllabus in order to prepare for those examinations, which in turn will assist those students get a passing score.

When working through the exercises in the NCERT textbook, if you run into any type of difficulty or uncertainty, you may use the swc NCERT Solutions for class 9 as a point of reference. While you are reading the theory form textbook, it is imperative that you always have notes prepared. You should make an effort to understand things from the very beginning so that you may create a solid foundation in the topic. Use the NCERT as your parent book to ensure that you have a strong foundation. After you have finished reading the theoretical section of the textbook, you should go to additional reference books.

NCERT SOLUTIONS FOR CLASS 9 SCIENCE CHAPTER 13 WHY DO WE FALL ILL – Exercises

Question 1. State any two conditions essential for good health.
Solution :
The Two conditions essential for good health are :
(i) An individual must have better health facilities and more professionals to deal with health problems.
(ii) All basic necessary conditions to prevent diseases must be present. For example, proper garbage collection and disposal, clearing of drains, supply of healthy drinking water, etc.

Question 2. State any two conditions essential for being free of disease.
Solution :
The Two conditions essential for being free of diseases are :
(i) Personal hygiene and cleanliness are necessary to stay away from diseases.
(ii) Individuals should take a balanced diet that contains carbohydrates, fats, proteins, vitamins, fibres, and proper quantity of water.

Question 3. Are the answers to the above Questions necessarily the same or different? Why?
Solution : No. The answers to the above Questions may not necessarily be the same. This is because a disease free state is not the same as being healthy. Good health is the ability of an individual to realise his or her full potential. Individuals can have poor health without having any identifiable disease. Also, health is related to society and community, whereas having a disease is about an individual sick person. Hence, the conditions for good health and for being disease free can be same or even different.

Question 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?
Solution : Symptoms such as a headache, stomach pain, nausea, vomiting, fever, etc., make us feel that we are sick and must visit a doctor. These symptoms basically indicate that there might be a disease, but we cannot predict the kind of disease. Therefore, it becomes necessary to visit a doctor so that the disease can be identified and can be treated with proper medication.
However, if only one of these symptoms is present, we usually do not visit a doctor. This is because such symptoms do not have much effect on our general health and ability to work. However, if a person is experiencing these symptoms for quite sometime, then he needs to visit a doctor for proper treatment.

Question 5. In which of the following case do you think the long-term effects on your health are likely to be most unpleasant?
• if you get jaundice,
• if you get lice,
• if you get acne.
Why?
Solution : The long-term effects on our health are likely to be most unpleasant if we get jaundice because the symptoms severely affect our internal organs and persist for long time.

Question 6. Why are we normally advised to take bland and nourishing food when we are sick?
Solution : We are normally advised to take bland and nourishing food when we are sick because we are weak during illness and need complete nourishment for faster recovery.

Question 7. What are the different means by which infectious diseases are spread?
Solution :
Infectious diseases can spread by following means :
a) through contaminated food and water
b) through air
c) through vectors or carriers (housefly, mosquito etc)
d) through direct skin contact or sexual contact
e) through cuts and wounds

Question 8. What precautions can you take in your school to reduce the incidence of infectious diseases?
Solution :
To reduce the incidence of infectious diseases in my school the precautions will include :
(i) Isolating diseased students and clean surroundings
(ii) clean food and purified drinking water
(iii) not eating junk food and open/uncovered food materials

Question 9. What is immunisation?
Solution : Immunisation is a method of preparing memory cells in immune system. In this method weak or dead microbes of disease are injected in the body such that develop memory lymphocytes(WBCs) but do not cause disease. eg vaccination against polio, tetanus etc.

Question 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?
Solution :
DPT vaccine: it is for diphtheria, pertussis and tetanus in infants.
Pulse polio vaccine: it is to prevent polio.
BCG vaccine: bacillus calmette Guerin vaccine for tuberculosis.
Hepatitis vaccine
TAB vaccine for typhoid.
tuberculosis and diarrhea are the major health problems in our area.

Question 11. 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.
Solution :
I fall ill only once last year. I had suffered from typhoid.
(a) I will avoid street food specially those which are cooked at unhygienic places
and kept uncovered.
(b) I shall keep my surroundings cleaner than earlier.

Question 12. 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.
Solution : 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 preventive measures like personal and community hygiene/cleanliness and immunisation to prevent infectious diseases.

Question 13. 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.
Solution : Three most common diseases in my locality are diarrhoea, malaria and tuberculosis and following steps I would suggest to be taken by our local authorities to bring down the incidence of these diseases :
(i) Supply of safe drinking water and preventing incidences of open drains.
(ii) Improved and hygienic environment free of garbage and wastes thrown in the open.
(iii) Eradication of mosquitoes
(iv) mmunisation/vaccination camps

Question 14. A baby is not able to tell her/his caretakers that she/he is sick. What would help us to find out
(a) that the baby is sick?
(b) what is the sickness?
Solution :
(a) If the baby is crying and remains restless no matter whatever is done to ease him/her out then he/she is sick.
(b) We must observe symptoms and severity of the symptoms to diagnose the sickness.

Question 15. 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?
Solution : 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 such that she is very likely to fall sick.

Question 16. 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?
Solution : We are most likely to fall sick when a friend is suffering from measles since measles is an infectious/communicable disease that can spread easily from one person to the other.

Conclusions for NCERT SOLUTIONS FOR CLASS 9 SCIENCE CHAPTER 13 WHY DO WE FALL ILL

SWC academic staff has developed NCERT answers for this chapter of the ninth grade science curriculum. We have solutions prepared for all the ncert questions of this chapter. The answers, broken down into steps, to all of the questions included in the NCERT textbook’s chapter are provided here. Read this chapter on theory. Be certain that you have read the theory section of this chapter of the NCERT textbook and that you have learnt the formulas for the chapter that you are studying.