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Diseases Cause and Control

ICSE · Class 9 · Biology

Complete topic list for Diseases Cause and Control in ICSE Class 9 Biology. Key concepts, sub-topics, and what to focus on for board exams.

42 questions42 flashcards5 concepts

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An infographic illustrating the four categories of diseases based on their extent of occurrence: Endemic, Epidemic, Pandemic, and Sporadic, with examples for each.
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4 Topics · ICSE Class 9 Biology

Topics in Diseases Cause and Control

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.
3

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.

Key Concepts

Central concept: Disease as a disturbance of normal body functioning caused by infectious or non-infectious factors, and the ways diseases are classified, transmitted, prevented, and controlled.

Meaning of diseaseCategories of diseasesExtent of occurrenceCommunicable diseasesNon-communicable diseasesBacterial diseasesViral diseasesProtozoan diseases

Frequently Asked Questions

What are the important topics in Diseases Cause and Control for ICSE Class 9 Biology?
Diseases Cause and Control covers several key topics that are frequently asked in ICSE Class 9 board exams. Focus on the core concepts listed on this page and practise related questions to build confidence.
How to score full marks in Diseases Cause and Control — ICSE Class 9 Biology?
Understand the core concepts first, then work through the 42 practice questions available for this chapter. Revise formulas and definitions regularly, and use flashcards for quick recall before the exam.

Sources & Official References

Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.

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All 19 chapters — ICSE Class 9 Biology Syllabus

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