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In this article you will get the CBSE Class 9 Science, Why Do We Fall Ill: Chapter notes.
With the changed exams structure for CBSE Class 9, students will have to study the whole syllabus for the annual exams. So, they must have the material which can be accessed easily and help them revise the syllabus quickly and effectively.
Jagranjosh, here brings the CBSE Class 9 Science, Why Do We Fall Ill: Chapter notes. These chapter notes are prepared by the subject experts and cover every important topic from the chapter. You will get a crisp and brief explanation of all these topics so as to help you learn easily and in an organized manner. At the end of the notes you can try the questions asked from the discussed set of topics. These questions will help you to track your preparation level and get a hold on the subject.
CBSE Class 9 Science Syllabus 2017-2018
Main topics covered in this part of CBSE C
Health
Disease and its Types
Causes of disease
Antibiotics
Principle of Treatment
Principles of Prevention
Key notes for Chapter - Why Do We Fall Ill, are:
Health
Health is a state of complete physical, mental and social wellbeing.
Disease
Any disturbance in the structure or function of any organ or part of body.
It may be caused due to the attack of pathogens (virus, bacteria), lack of nutritious diet/balanced diet and lack of public health services.
Types of Disease
Diseases are basically of two types. They are:
(i) Acute Disease
The disease which lasts for only a short period of time is called Acute Disease.
For example: Influenza (Flu) , Common cold, etc.
(ii) Chronic Disease: The disease which lasts for long period of time is called Chronic Disease
For example: TB, Cancer, etc.
Difference between Acute Disease & Chronic Disease
S. No.
Acute Disease
Chronic Disease
1.
They are short duration disease
They are long lasting disease
2.
Patient recovers completely after the cure
Patient does not recover completely
3.
There is no loss of weight or feeling of tiredness afterward
There is often loss of weight of feeling of tiredness
4.
There is short duration loss of work and efficiency
There is a prolonged loss of work and efficiency
Causes of Diseases:
Causes of diseases are explained below:
Immediate and Contributory Cause
Immediate cause: The organisms that enter our body and causes disease is called immediate cause. For example, virus, bacteria, protozoa etc.
Contributory cause: The secondary factors which led these organisms enter our body are called as contributory cause. For example, dirty water, contaminated food, improper ourishment, poor standard of living etc.
Infectious and Non-infectious Cause
Infectious causes: They include the agents like microbes or micro-organisms as the immediate causes which spread the disease from an infected person to a healthy person.
Non-infectious causes: The disease which does not spread by contact between infected and healthy person through air and water, is called non-infectious disease.
Infectious and Non-infectious Diseases
Infectious Diseases: The diseases which spread due to infection by micro-organisms are called infectious diseases.
When a disease causing organism enters our body it causes infection, it multiplies and grows in the body called host and micro-organisms multiplies in the host body.
For Example: Tuberculosis, tetanus, Common cold, AIDS, etc.
Non-infectious Diseases: The disease which does not spread by contact between infected and healthy person through air and water, is called non-infectious disease.
For example: Cancer, genetic abnormalities, high blood pressure, etc.
Means of Spreading Infectious Diseases:
S. No.
Type of Disease
Example
1.
Air born Diseases
Common cold, influenza, measles, tuberculosis.
2.
Water born diseases
Cholera, typhoid, hepatitis.
3.
Sexual Diseases
AIDS, Syphilis.
4.
Animal born Disease
Rabbis.
Antibiotics
These are the chemicals (medicine, drugs) that block biochemical pathways important for bacteria. They are used for diseases caused by bacteria.
Antibiotics do not work against viral infections as the viruses do not have their own biochemical mechanisms but depend upon that of the h