Short notes and key points of class 9 biology chapter-why do we fall ill
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Short notes and key points of class 9 biology chapter-why do we fall ill
May 13, 2022, 16:45 IST
Class-9 biology chapter-why do we fall ill
Health and disease in human communities are very complex issues with many interconnected causes.
Health
The term health always implies the idea of being well. It is generally used in the context of an individual being healthy or not. However, it is applied in other contexts too.
Disease
The term disease literally means 'without ease' or being uncomfortable. It is just the opposite of health. Normally, any physical or functional change from the normal state that causes discomfort, or disability, or impairs the health of a living organism is called a disease. According to other definition, malfunctioning of the body or some part with specific symptoms is termed a disease.
Types of Diseases
Depending upon the duration for which a disease persists, diseases are grouped as acute diseases and chronic diseases .
Difference between Infectious and non-infectious diseases
| S.No. | Infectious disease | S.No. | Non-infectious disease |
| 1. |
Diseases that can be spread from diseased person
to healthy person. |
1. |
Diseases that cannot be spread from diseased person to
healthy person. These diseases remain confined to the person only |
| 2. |
These diseases can be transmitted from one
person to another by means of air, water, food, contact and insects. |
2. |
These diseases do not get transmitted
through air, water, food and contact. |
Do solve NCERT questions with the help of NCERT solutions for class 9 Science prepared by academic team of Physics Wallah.
