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(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?

Answer :

A person can most likely fall sick when his/her friend is suffering from measles. It 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 will get infected with the disease.

- 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.
- 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.
- 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.
- 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?
- 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?

- NCERT solutions for class 9 maths chapter 1 Number Systems
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