Class 12 Biology — Chapter 7: Human Health and Disease

What you'll learn

• ▸Concept of Health and Disease
• ▸Pathogens and Common Human Diseases
• ▸Bacterial Diseases: Typhoid and Pneumonia
• ▸Viral Disease: Common Cold
• ▸Protozoan Disease: Malaria
• ▸Life Cycle of Plasmodium
• ▸Protozoan Disease: Amoebiasis
• ▸Helminthic Diseases: Ascariasis and Filariasis

Chapter Summary

--- PAGE 1 --- Chapter 7 Human Health and Disease Chapter 8 Microbes in Human Welfare Biology is the youngest of the formalised disciplines of natural science. Progress in physics and chemistry proceeded much faster than in Biology. Applications of physics and chemistry in our daily life also have a higher visibility than those of biology. However, twentieth century and certainly twenty-first century has demonstrated the utility of biological knowledge in furthering human welfare, be it in health sector or agriculture. © The discovery of antibiotics, and synthetic plant-derived drugs, anaesthetics have changed medical practice on one hand and human health on the other hand. Life expectancy of human beings have dramatically changed over the years. Agricultural practices, food processing and diagnostics have brought socio-cultural changes in human communities. These are briefly described in the following three chapters of this unit. Reprint 2025-26 --- PAGE 2 --- M.S. SWAMINATHAN (192…

Practice Questions from this Chapter

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1. Explain how vaccines work. Get Solution →
2. Describe healthy lifestyle choices. Get Solution →
3. List common symptoms of flu. Get Solution →
4. According to the chapter, what is the complete definition of health? Get Solution →
5. Which pathogenic bacterium is responsible for causing typhoid fever? Get Solution →
6. The Widal test is a diagnostic procedure used to confirm which of the following diseases? Get Solution →
7. Rhino viruses are a group of pathogens that cause which common infectious ailment? Get Solution →
8. Malaria, a disease man has been fighting for years, is caused by which tiny protozoan? Get Solution →

Did you know?

• 💡 The human body contains more bacterial cells than human cells.
• 💡 A common cold virus can survive on surfaces for several hours.
• 💡 The Black Death in the 14th century killed nearly half of Europe's population.
• 💡 Penicillin, the first antibiotic, was discovered accidentally from a common mold.
• 💡 Your body produces a liter of snot daily, most of which you swallow.

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