Chapter 16 of 19
Revision Notes
Diseases Cause and Control — Revision Notes
ICSE · Class 9 · Biology
Diseases Cause and Control revision notes for ICSE Class 9 Biology: 4 topics in quick points. Part of the ICSE Class 9 Biology syllabus.
42 questions42 flashcards5 concepts
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Key Topics to Revise
1
1. Meaning and Classification of Diseases
- Disease means the normal functioning of the body is disturbed.
- Diseases may be serious, and some can become fatal.
- Diseases are classified by extent of occurrence, communicability, kind of pathogen, and mode of transmission.
2
2. Germs That Cause Disease
- Diseases are caused by pathogens, which are disease-causing organisms.
- The main pathogen groups here are bacteria, viruses, protozoa, and helminths.
- Bacterial diseases in the syllabus are cholera, typhoid, and tuberculosis.
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3. Bacterial Diseases
- Cholera attacks the intestinal tract and is caused by Vibrio cholerae.
- Cholera spreads through food and water by the faeco-oral route, aided by flies.
- Cholera causes vomiting, loose motions, very little urination, and dehydration.
4
4. Protozoan Diseases
- Malaria is caused by Plasmodium and is transmitted by the bite of the female Anopheles mosquito.
- Plasmodium grows and multiplies in red blood cells and destroys them.
- The incubation period of malaria is about three weeks.
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Full NotesKey Concepts
Disease is a condition inIncubation period is the period betweenCommunicable or infectious diseases are causedEndemic diseases are found inCholera
Frequently Asked Questions
What are the important topics in Diseases Cause and Control for ICSE Class 9 Biology?
Key topics in Diseases Cause and Control include Meaning and Classification of Diseases, Germs That Cause Disease, Bacterial Diseases, Protozoan Diseases. Study these first, then practise questions on each for Class 9 exams.
How should I revise Diseases Cause and Control for Class 9 exams?
Learn the core ideas first, then work through the 42 practice questions on Diseases Cause and Control. Revise definitions regularly and use flashcards for quick recall before the exam.
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