NCERT Solutions for Class 9 Science Chapter 13 Why Do We Fall Ill
Q1. State any two conditions essential for good health.
Ans. Two conditions essential for good health are:
1. clean surroundings
2. nutritious food
Q2. State any two conditions essential for being free of disease.
Ans. The two conditions essential for being free of diseases are :
1. Balanced diet
2. Maintaining personal and public hygiene.
Q3. Are the answers to the above questions necessarily the same or different? Why?
Ans. No, the answers to the above questions are different because a person may be free of disease. We can call him that he is free from disease but his mental, social or economical health may not be good. so, being free from disease and being healthy are two different things.
Q1. 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?
Ans. Three reasons due to which we would think we are sick:
1. Cough and high fever
2. loose motion
3. Common Cold
These symptoms indicate that there may be a disease but do not indicate what the disease is. So, it is advisable that one would still visit the doctor for treatment and to know the cause of the above symptoms.
Because the doctor will get laboratory tests done, for the confirmation of the disease.
Q2. In which of the following cases 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.
Ans. I think lice and acne will not have a long-lasting effect on our health because they can be cured in a short duration. But jaundice is the disease that can have the most unpleasant effect on our health:
(ii) joint pain etc.
Q1. Why are we normally advised to take bland and nourishing food when we are sick?
Ans. During illness, the functioning of our body gets disturbed and our immune system also gets weakened. Our body needs the energy to release cells to overcome the infection, the wear and tear of body organs.
So, nourishing food is required, which is easily digestible and contains all required nutrients. so that our body overcomes the infection easily.
Q2. What are the different means by which infectious diseases spread?
Ans. The different means by which infectious diseases spread are:
(i) Trough Air: If an infected person sneezes or coughs. he/she spreads small droplets into the air which contains germs that can infect a healthy person.
(ii) Through Food and Water: If contaminated food or water is eaten or drunk by someone. He/She may also be infected by diseases like cholera, typhoid, amoebiasis etc.
(iii) Through Sexual contact: Diseases like syphilis, AIDS etc, can also spread through sexual acts between two people.
(iv) Through Vectors: organisms spread diseases from sick person to healthy person called vectors. eg. mosquito spreads malaria, dengue.
Q3. What precautions can you take in your school to reduce the incidence of infectious diseases?
Ans. Following precautions can be taken :
- by maintaining cleanliness.
- by providing clean drinking water.
- washing hands properly before eating lunch.
- stay away from the student/students who is/are suffering from the disease.
Q4. What is immunisation?
Ans. Immunisation is a process through which the body develops immunity against a disease.
Q5. 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
Ans. There are different immunisation programmes available at the nearest health centre in my location i.e. Immunisation for infants, children and immunisation for pregnant women.
Disease which are the major health problems in my area is polio, typhoid, malaria, dengue, hepatitis-B etc.
Q1. How many times did you fell ill in the last one year? What were the illnesses?
(i) Think of one change you could make in your habits in order to avoid any /most of the illnesses.
(ii) Think of one change you would wish for your surroundings in order to avoid any /most of the illnesses.
Ans. I fell ill once in the last one year. The diseases from which I suffered were CORONA and Common Cold.
(i) One change that I would make in order to stay disease-free is by maintaining a proper diet and exercise daily.
(ii) I think people should be aware of how to improve their immunity.
Q2. A doctor/nurse/health-worker is exposed to more sick people than others in the community. Find out how does she/he avoid getting sick herself/himself.
Ans. A doctor/nurse/health-worker takes the following precautions to avoid getting sick:
(i). They use mask, gloves to void direct contact with a sick person.
(ii) They wash their hands properly before eating or drinking something.
(iii) Take a balanced diet.
Q3. 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.
|Common diseases||Steps to bring down the diseases spread|
|Typhoid||Drink clean water|
Q4. A baby is not able to tell his/her. caretakers that she/he is sick. What would help us to find out:
(a) that the baby is sick?
(b) what is the sickness?
Ans. a. if he/she does not eat properly, crying every time, body temperature is high etc. would help us to find that baby is sick.
b. The symptoms could help us to find out the sickness of the body.
Q5. 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.
Ans. When she is on a four-day fast after recovering from malaria and is taking care of someone suffering from chicken-pox.
As she is taking care of someone suffering from chicken-pox and was on fast for the last four-day because her immunity had lowered. That’s why there is more chance that she will fall sick.
Q6. 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.
Ans. (c) When your friend is suffering from measles, as it is an infectious disease.