class 9 chapter 13 ncert question answer
Answers
Answer:
Explanation:
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.