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Why is rabies also called as hydrophobia? Write the name of a disease that spreads through direct contact. The diseases which are present from the time of birth and are hereditary are called congenital diseases. WHO defines health as a state of complete physical, mental and social well-being and not merely an absence of disease or infirmity.Ĭlassify diseases on the basis of their time of occurrence.Ĭongenital diseases and acquired diseases. How can dehydration of the body be prevented?ĭehydration can be prevented by intake of ORS (Oral Rehydration Solution). It is the personal health along with the environmental services for the importance of health of the community. Person, animal, object or substance from which an infectious agent passes or is disseminated to the host is known as the source of infection. The conditions in which a sick person experience headache, watering of eyes, loose motions, are collectively called the symptoms of a disease.Ī reservoir is defined as any person, animal, arthropod, plant, soil or substance in which an infectious agent lives and multiplies for its primary survival. Why Do we Fall Ill Class 9 Extra Questions Science Chapter 13Įxtra Questions for Class 9 Science Chapter 13 Why Do we Fall Ill Why Do we Fall Ill Class 9 Extra Questions Very Short Answer Questions