Active Immunity and Passive Immunity
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Active Immunity |
Passive Immunity |
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It is developed by contact with pathogens or antigens. |
It is developed when readymade antibodies are inserted or injected in the body by vaccination. |
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It shows no side-effect. |
It shows some reactions. |
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It is slow but has long-lasting effects. |
It is fast but has short-term effects. |
NCERT Notes on Class 12 Biology Chapter 7 – Human Health and Disease
NCERT Chapter 7 of Class 12 Notes on Human Health and Disease: According to the World Health Organisation, health can be defined as a state of complete physical, mental, and social well-being and not merely the absence of disease and infirmity. Good health has many benefits like it helps to keep us happy. Our skin, teeth, and eyes remain healthy, support muscles, enhance immunity, strengthen bones, and lower the risk of heart ailments, diabetes, and some cancers. It also supports healthy pregnancies and breastfeeding among women.
NCERT Notes on Chapter 7 Human Health and Disease: On the other hand, disease is any undesirable change in our body that may keep us disturbed whether it is physical, mental, or social. Our body can undergo a number of changes like any of the organs can stop functioning in a proper way which can also be associated with some other signs and symptoms. In plants and animals, the disease can also be occurred by pathogens, i.e. disease-causing organisms such as fungi, bacteria, viruses, protozoa, and certain types of invertebrates like tapeworms, wuchereria. Unhygienic surroundings, nutritional deficiencies, and unhealthy lifestyles also cause diseases.
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