NCERT Solutions for Class 9 Science Chapter 13- Why Do We Fall Ill?

NCERT Solutions Class 9 Science Chapter 13 – CBSE Term II Free PDF Download

NCERT Solutions for Class 9 Science Chapter 13 Why do we fall Ill renders students with accurate solutions to all the exercises and in-text questions provided in the NCERT Class 9 textbook that aligns with the CBSE board. Here, students are provided with the ultimate study material, the NCERT Class 9 Solutions that are executed by a team of subject matter experts with thorough knowledge of the subject. Referring and solving these solutions ought to be one of the best ways to crack the term II examinations and score outstanding marks.

The Solutions are solved skillfully with the use of an easily comprehensible language for Class 9 students. This helps them understand the concepts, thus promoting active learning and concept learning. The Solutions provided are reviewed by the expert team and carefully designed to score maximum marks on the lines of the CBSE Term II exam.

The NCERT Solutions assist in getting familiarised with the textbook. These solutions are easily accessible and completely reliable with step-by-step instructions to understand solutions in the most simplified manner. Practising Solutions is one of the most appropriate strategies to outperform in the CBSE Term II examinations.

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Access Answers to NCERT Class 9 Science Chapter 13 – Why Do We Fall Ill? (All intext and exercise questions solved)

1. State any two conditions essential for good health.

Solution:

1. Good economic condition and earnings
2. Social environment

2. State any two conditions essential for being free of disease.

Solution:

1. Living in a healthy and hygienic environment.
2. Getting vaccination against infectious disease whenever required.

3. Are the answers to the above questions necessarily the same or different? Why?

Solution:

The answers to the above questions are different because a person may be free of disease but not be good mentally, socially and economically.

In-Text Questions 13.2.5

1. 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:

(a). Headache, fever

(b). Muscle pain

(c). Dysentery

Usually, we do not visit a doctor if any one of the symptoms is observed as it does not affect the general health of the ability to work. But, if these symptoms are seen for a long period of time then we should consult a doctor for proper treatment.

2. 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:

Jaundice causes a long term effect on our health. This chronic disease lasts for a long period of time. Jaundice develops slowly and does not spread rapidly.

In-Text Questions 13.3.5

1. Why are we normally advised to take bland and nourishing food when we are sick?

Solution:

When we fall sick, normal body functioning gets disturbed and do not function normally. As a result, improper digestion ability, we lose appetite and absorption of food is slow. Therefore, we are advised to take bland and nourishing food during sickness as it is easily digested and contains adequate nutrients, vitamins and minerals to produce energy.

2. What are the different means by which infectious diseases are spread?

Solution:

Infectious diseases are generally spread through the following modes – Water, air, vector such as mosquito, sexual contact, physical contact with the affected, or by using affected person’s clothes, bedding, utensils, etc.

3. What precautions can you take in your school to reduce the incidence of infectious diseases?

Solution:

Some of the precautions that we can take in our school to reduce the incidence of infectious diseases are –

(a). Trying to stay away from students who are infected.

(b). Covering mouth and nose while coughing and sneezing.

(c). Keeping the school environment clean so that there are no multiplication vectors.

(d). Consuming safe aqua guard water.

4. What is immunization?

Solution:

The method to boost our immune system with the help of vaccines that help the body to fight against infectious diseases is called immunization.

5. What are the immunization programs available at the nearest health center in your locality? Which of these diseases are the major health problems in your area?

Solution:

The immunization programs available at the nearest health centers are Measles, Mumps, and Rubella (MMR), polio vaccine, jaundice, Diptheria, Pertusis, and Tetanus (DPT), typhoid, hepatitis B.

From above typhoid and jaundice create major health problems.

Exercise Questions

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.

Solution:

I fell ill twice in the last year. I suffered from diarrhea first and then dengue fever.

(a) The changes made by me in my habits after suffering from these diseases are –

(i) I will always drink purified and clean water and wash my hands before eating any food item.

(ii) I will live in a clean environment where disease spreading vectors will not multiply.

Example of multiplying vectors are mosquitoes.

(b) One change I would wish for in our surroundings in order to have a healthy society is by making pure drinking water available for the people. Consuming impure water is the root cause of many infectious diseases.

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.

Solution:

Some important precautions that need to be taken by the doctor/nurse/health-worker while treating people who are sicker than others in the community are –

(a). When in contact with a diseased person not to forget to wear a mask.

(b). Drinking purified water.

(c). Not neglecting cleanliness and personal hygiene.

(d). Keeping themselves covered appropriately when moving in an infected region

(e). Eating nutritious food and maintaining a healthy diet.

3. Conduct a survey in your neighborhood 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:

The following three are the most common diseases in any neighborhood:

Cold and cough, loose motions, and malaria.

Some of the preventive measures that can be taken are:

(a). By drinking fresh, uncontaminated, and clean water.

(b). By maintaining hygienic sanitary conditions.

(c). By educating people about various preventive measures with the help of posters, and pamphlets.

Exercise Questions 188

4. 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). It can be found out by observing the behavioral changes of the child such as:

• Improper food intake
• Constant crying
• Mood changes frequently

(b). The sickness can be determined with the help of symptoms or indications shown by the child. The symptoms could be loose motion, vomiting, paleness in body and fever.

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?

Solution:

A condition in which a person is most likely to fall sick when she is on a four-day fasting as soon as she has recovered from malaria and is taking care of someone suffering from chicken-pox. Because she has not completely recovered from malaria and she is fasting when her immune system is still weak. At this stage her body will not be able to fight against infection and if she is taking care of someone else suffering from chicken pox even she can get infected with chickenpox virus and will fall sick again.

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?

Solution:

A person can most likely fall sick when his/her friend is suffering from measles. It is a highly contagious disease and can easily be transferred through air and respiration. It is always better to stay away from your friend who is affected with measles, else even you may get infected with the disease.

NCERT Solutions for Class 9 Science Chapter 13 – Why Do We Fall Ill?

Why Do We Fall Ill? Is the 13th Chapter in the NCERT Class 9 Science textbook which deals with the various notions of health, diseases, types of diseases and the precautionary measures for various diseases. The weightage for this Chapter is 3 marks as observed from the question papers of previous years and is expected to hit the same pattern this time around, wherein a 3 mark question is expected to appear. Consequently, to score optimum marks, students are advised to practise NCERT Solutions.

In-depth knowledge of all the concepts of this chapter will help students to achieve allocated marks which would significantly contribute to the final marks scored in the Term II CBSE examination. The questions are picked from the NCERT textbook prescribed by the CBSE board, hence chances of these questions appearing in the CBSE Term II examination are the highest. As a result, solutions are prepared in accordance.

List of subtopics covered in Chapter 13 – Why Do We Fall Ill?

List of Exercise

Number 13.1 – 13.1.3 3 Question ( 3 short)

Number 13.1.4 -13.2.5 2 Question ( 2 short)

Number 13.3.5 5 Question ( 5 short)

Exercise Solutions 3 Question ( 2 long, 1 short)

Exercise Solutions 3 Question ( 1 long, 2 short)

NCERT Solutions for Class 9 Science Chapter 13 – Why do we fall ill?

In this chapter, we learn about different aspects of health, right from the definition to the treatment of various diseases. Further discussed are the different types of diseases, such as infectious and non-infectious diseases, along with distinguishing between being healthy and disease-free.

Through this chapter, we learn about the causes of diseases, the pathogens, different vectors carrying diseases and how we are inflicted with diseases due to our physical surroundings. The unit also briefs about the various treatment methods and the importance of public health as well as personal hygiene through immunization and various other means.

Key Features of NCERT Solutions for Class 9 Science Chapter 13 – Why do we fall ill?

• NCERT Solutions for the chapter ‘Why do we fall ill?’ have been answered by extracting the most important and relevant information pertaining to the question
• Solutions are to the point and crisp
• Use of pointers to learn quickly and remember easily
• Solutions have been designed in such a way so as to fetch optimum marks
• Use of tabular columns wherever necessary