NCERT Solutions for Class 12 Biology Chapter 8 - Human Health and Disease


NCERT Solutions for Class 12 Biology Chapter 8 - Human Health and Disease: You know that biology is the youngest of the formalized 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 higher visibility than those of biology. However, the twentieth century and certainly twenty-first century has demonstrated the utility of biological knowledge in furthering human welfare, be it in the health sector or agriculture. The discovery of antibiotics, and synthetic plant-derived drugs, anesthetics have changed medical practice on one hand and human health on the other hand. 

In Chapter 8 - Human Health and Disease you will study that health is not just the absence of disease. It is a state of complete physical, mental, social and psychological well-being. Diseases like typhoid, cholera, pneumonia, fungal infections of the skin, malaria and many others are a major cause of distress to human beings. Vector-borne diseases like malaria especially one caused by Plasmodium falciparum, if not treated, may prove fatal.

Here are the important topics of Chapter 8 - Human Health and Disease of NCERT Biology Class 12:

8.1 Common Diseases in Humans

8.2 Immunity

    8.2.1 Innate Immunity

    8.2.2 Acquired Immunity

    8.2.3 Active and Passive Immunity

    8.2.4 Vaccination and Immunisation

    8.2.5 Allergies

    8.2.6 Auto Immunity

    8.2.7 Immune System in the Body

8.3 AIDS

8.4 Cancer

8.5 Drugs and Alcohol Abuse

    8.5.1 Adolescence and Drug/Alcohol Abuse

    8.5.2 Addiction and Dependence

    8.5.3 Effects of Drug/Alcohol Abuse

    8.5.4 Prevention and Control

Our immune system plays a major role in preventing these diseases when we are exposed to disease-causing agents. The innate defenses of our body like skin, mucous membranes, antimicrobial substances present in our tears, saliva and the phagocytic cells help to block the entry of pathogens into our body.

Helpful tips for the prevention of diseases:

  1. Personal cleanliness and hygiene

  2. Public health measures like proper disposal of waste

  3. Decontamination of drinking water

  4. Control of vectors like mosquitoes

  5. Immunization

In NCERT Chapter 8 - Human Health and Disease you will also study that among other diseases, AIDS and cancer kill a large number of individuals worldwide. AIDS caused by the human immunodeficiency virus (HIV) is fatal but can be prevented if certain precautions are taken. Many cancers are curable if detected early and appropriate therapeutic measures are taken. Of late, drug and alcohol abuse among youth and adolescents is becoming another cause of concern.

After going through the Human Health and Disease chapter you will be able to answer the following questions:

  • Q1. What measure would you take to prevent water-borne diseases?

  • Q2. Discuss with your teacher what does ‘a suitable gene’ means, in the context of DNA vaccines.

  • Q3. Name the primary and secondary lymphoid organs.

If you have any doubt or not able to answer by yourself then NCERT Solutions will help you to understand the concept behind it.

Try to solve all the questions given in the NCERT Solutions for Class 12 Biology Chapter 8 - Human Health and Disease will help you to answer them correctly.

NCERT Solutions for Class 12 Biology Chapter 8 - Human Health and Disease: Solved Exercise Questions

NCERT Solutions class 12 – Biology

Chapter 1

Reproduction in organisms

Chapter 2

Sexual Reproduction in Flowering Plants

Chapter 3

Human Reproduction

Chapter 4

Reproductive Health

Chapter 5

Principles of Inheritance and Variation

Chapter 6

Molecular basis of inheritance

Chapter 7


Chapter 9

Strategies for enhancement in food production

Chapter 10

Microbes in Human Welfare

Chapter 11

Biotechnology: Principles and Processes

Chapter 12

Biotechnology and its applications

Chapter 13

Organisms and Populations

NCERT Solutions for Class 12- Subject wise

NCERT solutions for Class 12 Biology

NCERT solutions for Class 12 Maths

NCERT solutions for Class 12 Chemistry

NCERT solutions for Class 12 Physics


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