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Why Do We Fall ill - class 9 science Textbook solutions

 Why Do We Fall ill

1.State any two conditions essential for good health.

1.    Public cleanliness
2.    Good quality of food and water are two conditions which are essential for good health.

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

1.    By doing exercises and walking, our body is healthy
2.    We should consume balanced food and follow health tips.
These are the conditions which are essential for being free of diseases.

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

Answer of Both questions is alike. Both are related to maintaining good health.

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?

Three reasons why we would think that wear sick and ought to see a doctor are:
1.    There is a chance of getting sick due to microbial activity.
2.    Due to the deficiency of vitamins, minerals (nutrients) we get diseases.
3.    Due to genetic differences also we get diseases.

5.In which of the following case 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. Why?
In these three cases, if we get jaundice is most unpleasant. Because jaundice virus is present in liver cells. Liver is the largest and important organ of our body. If it is damaged, leads to more danger to our body.

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

When we are sick, we have a weakness. If we consume hard food, it is difficult to digest it. Hence we should consume bland food. Nourishing food is also essential as they provide nutrients for us. Therefore we should take bland and nourishing food when we are sick.

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

1.    Many pathogenic microbes spread from an infected person to others by different modes. These are called infectious diseases.
2.    Some of the microbes spread through air. These are called airborne infections. Eg: Common cold, pneumonia, and tuberculosis etc.
3.    Some of the diseases spread through water. If we drink polluted water which contains germs we get diseases. This is called water-borne infections. Eg: Cholera, Typhoid, Jaundice etc.
4.    Some of the diseases spread through sexual contact. Eg: Syphilis or AIDS.
5.    Some of the diseases spread through animals bite. Eg: Rabies.

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

1.    We should maintain the school environment clean.
2.    There should be a good drinking facility.
3.    There must be a Lavatory system.
4.    Children should be provided with vaccination periodically. Nutritious food should be provided to children.

9.What is an immunisation?

We have cells that specialise in killing infecting microbes. These cells go into action each time infecting microbes enter the body. If they are successful, we do not actually come down with any disease. The immune cells manage to kill off the infection long before it assumes major proportions. As we noted earlier, if the number of the infecting microbes is controlled, the manifestations of the disease will be minor. This is called the immunisation.

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?

Various vaccines are supplied from the health centre in our locality.
Eg: There are vaccines which prevent diseases like tetanus. Diphtheria, whooping cough, measles, polio, and other diseases.
Some of the diseases which cause major health problems in our area are cholera, Gastro enterprise, jaundice, measles etc.

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.
In the last one year, I had illness for two times. I was suffering from cold, dysentery and skin disease.
(a) As per the doctor’s advice we should take injections and medicines and nutritious food.
(b) Our surrounding should be clean, neat and tidy. We should drink filtered water, we must follow health tips such as exercises and walking etc.

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.

Doctor. Nurse and health worker will take precautionary measures to avoid getting sick herself/himself. When they suffer from sick they must take injection and medicines concerning to diseases along with nutritious food.

3.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 cold, cholera, cough are the three diseases, common to all people, we should prevent as follows:
1.    Public hygiene is one basic key to the prevention of infectious diseases.
2.    We can prevent such diseases by our immunity power.
3.    We should take proper vaccinations and food meant for different diseases.

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?

(a) Yes, the bay is sick.
(b) If the baby is suffering from dysentery and omitting we can find out it is suffering from cholera. By knowing the symptoms, we can find out diseases.

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 chickenpox.
c) When she is on a four-day fast after recovering from malaria and is taking care of someone suffering from chicken-pox. Why?
Among three conditions in the condition (c) a person most likely to fall sick because After fasting of four days, and taking care of someone suffering from chicken-pox. In this case, she becomes weak and she may fall sick.

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?
Under these conditions, in condition (b) we get sick because in two days travelling because of cold air and sneezing of co-travelers in the bus or train. Because of overcrowded and lack of ventilation. Common cold, pneumonia and T.B. are the diseases we may get by contact with others.

Additional Questions and Answer

1.What do you mean by health?

Health is therefore a state of being well enough to function well physically, mentally, and socially.

2.How do doctors diagnose diseases?

With the help of information from the Laboratory, doctors are diagnosing the diseases accurately.

3.What do you mean by acute diseases?

Some diseases last for only very short periods of time and these are called acute diseases.

4.What are Chronic Diseases?

Some ailments can last for a long time, even as much as a lifetime and are called chronic diseases.

5.How do we get Blood Pressure?

Because of overweight and lack of exercise, we get B.P.

6.How do we get skin infections?

From fungus, we may get skin infections.

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