Chapter 9 of 15
Revision Notes
Human Health and Disease — Revision Notes
ICSE · Class 12 · Biology
Human Health and Disease revision notes for ICSE Class 12 Biology: 4 topics in quick points. Part of the ICSE Class 12 Biology syllabus.
60 questions58 flashcards5 concepts
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Key Topics to Revise
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1. Health and Disease
- Health is a state of complete physical, mental, and social well-being and not merely the absence of disease.
- A healthy person is generally more efficient at work, and good health supports productivity and economic prosperity.
- Good health depends on balanced diet, personal hygiene, regular exercise, yoga, safe water, clean food, disease awareness, vaccination, waste disposal, and vector control.
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2. Communicable Diseases and Pathogens
- Communicable diseases are caused by pathogens such as bacteria, viruses, protozoa, helminths, and fungi.
- Infection begins when harmful organisms enter the body and multiply.
- Incubation period is the time between entry of the organism and appearance of symptoms.
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3. Bacterial Diseases
- Typhoid is caused by Salmonella typhi and affects the intestines.
- Typhoid fever persists for 1 to 8 weeks, and relapse may occur after apparent recovery.
- Widal test confirms typhoid fever.
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4. Viral Diseases
- Common cold is a highly contagious viral infection of the upper respiratory tract.
- Dengue fever is also called break-bone fever and is caused by dengue virus or Flavi virus.
- Dengue is transmitted primarily by female Aedes mosquitoes, especially Aedes aegypti, which bite during the day.
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Full NotesKey Concepts
Health is a state of completeDisease is a malfunctioning of bodyThese diseases are caused by specificPathogens are diseaseTyphoid is caused by Salmonella typhi
Frequently Asked Questions
What are the important topics in Human Health and Disease for ICSE Class 12 Biology?
Key topics in Human Health and Disease include Health and Disease, Communicable Diseases and Pathogens, Bacterial Diseases, Viral Diseases. Study these first, then practise questions on each for the ICSE Class 12 board exam.
How should I revise Human Health and Disease for the ICSE Class 12 board exam?
Learn the core ideas first, then work through the 60 practice questions on Human Health and Disease. Revise 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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