Why Do We Fall ill class 9 Notes Science

myCBSEguide App

myCBSEguide App

CBSE, NCERT, JEE Main, NEET-UG, NDA, Exam Papers, Question Bank, NCERT Solutions, Exemplars, Revision Notes, Free Videos, MCQ Tests & more.

Install Now


CBSE class 9 Science Chapter 13 Why Do We Fall ill notes in PDF are available for free download in myCBSEguide mobile app. The best app for CBSE students now provides Why Do We Fall ill class 9 Notes latest chapter wise notes for quick preparation of CBSE exams and school based annual examinations. Class 9 Science notes on Chapter 13 Why Do We Fall ill are also available for download in CBSE Guide website.

CBSE Guide Why Do We Fall ill class 9 Notes

CBSE guide notes are the comprehensive notes which covers the latest syllabus of CBSE and NCERT. It includes all the topics given in NCERT class 9 Science text book. Users can download CBSE guide quick revision notes from myCBSEguide mobile app and my CBSE guide website.

9 Science notes Chapter 13 Why Do We Fall ill

Download CBSE class 9th revision notes for Chapter 13 Why Do We Fall ill in PDF format for free. Download revision notes for Why Do We Fall ill class 9 Notes and score high in exams. These are the Why Do We Fall ill class 9 Notes prepared by team of expert teachers. The revision notes help you revise the whole chapter in minutes. Revising notes in exam days is on of the best tips recommended by teachers during exam days.

Download Revision Notes as PDF

CBSE Class 9 Science
Revision Notes
Why do we fall ill?

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

2.”Disease”( disturbed ease) means being uncomfortable. One or more systems of the body will change, give rise to “Symptoms” ( Cough, loose motions, pus formation, headache, fever, breathlessness, vomiting, fits, unconsciousness, inflammation , swelling and general effects – a Doctor look for the basis of symptoms). Diseases are basically two types- Acute Disease & Chronic Disease.

3.Acute Disease: The disease which lasts for only a short period of time is called Acute Disease Ex. Common Cold.

4.Chronic Disease: The disease which lasts for long period of time is called Chronic Disease Ex. Tuberculosis.

Acute DiseaseChronic Disease
They are short duration diseaseThey are long lasting disease
Patient recovers completely after the curePatient does not recover completely
There is no loss of weight or feeling of tiredness afterwardThere is often loss of weight of feeling of tiredness
There is short duration loss of work and efficiencyThere is a prolonged loss of work and efficiency

5. Causes of Diseases : Most of the diseases have many causes, rather than one single cause, like unclean water, nourishment, genetic differences, genetic abnormalities e.g. Based on the causes diseases are of two types: Non-Infectious Diseases and Infectious Diseases.

6. Non-Infectious Diseases: Not caused by infectious agents, mostly internal and non- infectious cause. Ex. Cancer

7. Infectious Diseases: Caused by infectious agents.

Type Of Disease

  • Bacterial diseases – Typhoid, Cholera, Tuberculosis, Acne, Anthrax,
  • Viral diseases – Common Cold, Influenza, Dengue fever, AIDS, Japanese encephalitis or brain fever
  • Fungal diseases: Skin diseases
  • Protozoan diseases -Malaria ( Plasmodium), Kalaazar (Leishmania), Sleeping sickness( Trypanosomes)
  • . Worm diseases – Ascariosis ( Round worm), Elephantiasis(Wuchereria )

8. The infectious diseases spread by agents are called as Communicable Diseases.

SNoType of DiseaseExample
1.Air born DiseasesPneumonia, common cold, Tuberculosis;
2.Water born diseasesCholera, hepatitis
3.Sexual DiseasesHIV, Syphilis
4.Animal born Disease– Rabbis.

*(Vector- the animal carrying infectious agent from a sick personto another potential host without getting affected Ex. Mosquitocarrying Malaria Parasite)

9. Principles of Treatment

  1. Antibiotics– many bacteria make a cell wall to protect themselves, the antibiotic (Penicillin) blocks the bacterial process that builds cell wall and blocks the biochemical pathways. Antibiotics do not work against viral infections. Antiviral medicine is harder than making Antibacterial medicine because Virus has only few biochemical mechanisms of their own. Other medicines bring down fever, reduce pain or loose motions. We can take bed rest to conserve energy.

10 Principles of Prevention :Following three limitation are normally confronted while treating an infectious disease:

  • Once someone has disease, their body functions are damaged and may never recover completely.
  • Treatment will take time, which means that someone suffering from a disease is likely to be bedridden for some time even if we can give proper treatment.
  • The person suffering from an infectious disease can serve as the source from where the infection may spread to other people.

General ways of preventing infectious disease

  • Air-borne – We can prevent exposure by providing living condition that are not over crowded.
  • Water-borne – prevent by providing safe drinking water. This is done by treating the water to kill any microbial contamination.
  • Vector-borne – We can provide clean environment, which would not allow mosquito breeding.

Proper nutrition is essential to maintain body immunity. There are vaccines against tetanus, diphtheria, whooping cough, measles, polio and many other diseases.

12. Prevention of disease is better than cure. Hygiene is the basic key to maintain good health.

Vaccination is another way to prevent the disease in which killed microbes are introduced into the body to develop antibodies and can preveent occurence of disease during actual entry of disease causing microbes.

Why Do We Fall ill class 9 Notes

  • CBSE Revision notes (PDF Download) Free
  • CBSE Revision notes for Class 9 Science PDF
  • CBSE Revision notes Class 9 Science – CBSE
  • CBSE Revisions notes and Key Points Class 9 Science
  • Summary of the NCERT books all chapters in Science class 9
  • Short notes for CBSE class 9th Science
  • Key notes and chapter summary of Science class 9
  • Quick revision notes for CBSE exams

CBSE Class-9 Revision Notes and Key Points

Why Do We Fall ill class 9 Notes. CBSE quick revision note for Class-9 Science, Chemistry, Maths, Biology and other subject are very helpful to revise the whole syllabus during exam days. The revision notes covers all important formulas and concepts given in the chapter. Even if you wish to have an overview of a chapter, quick revision notes are here to do if for you. These notes will certainly save your time during stressful exam days.

To download Why Do We Fall ill class 9 Notes, sample paper for class 9 Mathematics, Social Science, Science, English Communicative; do check myCBSEguide app or website. myCBSEguide provides sample papers with solution, test papers for chapter-wise practice, NCERT solutions, NCERT Exemplar solutions, quick revision notes for ready reference, CBSE guess papers and CBSE important question papers. Sample Paper all are made available through the best app for CBSE students and myCBSEguide website.


3 thoughts on “Why Do We Fall ill class 9 Notes Science”

Leave a Comment