Class 8 Science Curiosity Solutions English Medium

NCERT Solutions Class 8 Science Curiosity English Medium

3. Health: The Ultimate Treasure

Topic: Quick Revising Notes

Chapter Review – Health: The Ultimate Treasure

Important Definitions

Health: A state of complete physical, mental, and social well-being, not just absence of disease.

Disease: A condition that affects the normal functioning of the body or mind.

Symptom: What a person feels (e.g., pain, tiredness).

Sign: What can be seen or measured (e.g., fever, rash).

Pathogens: Disease-causing microorganisms like bacteria, viruses, fungi, and protozoa.

Communicable Diseases: Diseases that spread from one person to another through pathogens.

Non-communicable Diseases: Diseases that do not spread and are caused by lifestyle or environmental factors.

Vectors: Organisms like mosquitoes that transmit diseases.

Immunity: The body’s ability to fight against diseases.

Vaccine: A substance that helps the body develop protection against diseases.

Antibiotics: Medicines that kill bacteria but do not work against viruses.

Deficiency Diseases: Diseases caused due to lack of essential nutrients.

Chronic Diseases: Diseases that last for a long time (e.g., diabetes).

Quick Learning Points

• Health includes physical, mental, and social well-being.

• Healthy habits include balanced diet, exercise, hygiene, and proper sleep.

• Clean surroundings help prevent diseases.

• Diseases are of two types: communicable and non-communicable.

• Communicable diseases spread through air, water, food, contact, and vectors.

• Prevention includes handwashing, clean food and water, hygiene, and vaccination.

• Non-communicable diseases are related to lifestyle and environment.

• Immunity protects the body from infections.

• Vaccines provide acquired immunity.

• Antibiotics work only against bacteria.

• Overuse of antibiotics causes antibiotic resistance.

• Prevention is better than cure.

Final Concept

Health depends on lifestyle, environment, and immunity—not just the absence of disease.

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