You will get here Science Biology class 12 CBSE notes Chapter 7: Human Health and Disease. You can connect with us for every important update related to class 12.
Science Biology is a very important subject for you because it will help you increase your percentage as well as it is an important subject for your medical entrance exam. You can score high marks in this subject by studying notes and practicing MCQs. In this post, we will cover Chapter 7: Human Health and Disease.
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Key Content Of Chapter 7 Human Health and Disease
🔑 1. Definition of Health
Health is a state of:
- Physical well-being
- Mental well-being
- Social well-being
👉 Not just absence of disease.
⚠️ 2. Factors Affecting Health
Human health and disease depend on:
- Genetic factors (inherited disorders)
- Infections (pathogens)
- Lifestyle (diet, hygiene, exercise)
🦠 3. Types of Diseases
🔹 Infectious Diseases
- Spread from person to person
- Caused by pathogens
Examples:
Typhoid, Malaria, Pneumonia
🔹 Non-Infectious Diseases
- Do not spread
- Often genetic or lifestyle-based
Examples:
Cancer, Diabetes
🧬 4. Common Human Diseases
🔴 Typhoid
- Cause: Salmonella typhi
- Spread: Contaminated food/water
- Symptom: High fever
🫁 Pneumonia
- Cause: Bacteria
- Affects lungs
- Symptom: Breathing difficulty
🤧 Common Cold
- Cause: Rhinovirus
- Symptom: Sneezing, cough
🦟 Malaria
- Cause: Plasmodium
- Vector: Female Anopheles mosquito
- Symptom: Fever with chills
🦠 Amoebiasis
- Cause: Entamoeba histolytica
- Spread: Contaminated food
🪱 Helminth Diseases
- Example: Ascariasis, Filariasis
🍄 Fungal Disease
- Example: Ringworm
- Symptom: Skin itching
🛡️ 5. Immunity
👉 Ability of body to fight disease
🔹 Types:
1. Innate Immunity
- Present from birth
- Non-specific
Includes:
- Skin
- Stomach acid
- WBCs
2. Acquired Immunity
- Develops after infection
- Has memory
Types:
- Humoral (B-cells → antibodies)
- Cell-mediated (T-cells)
💉 6. Active vs Passive Immunity
| Type | Description |
|---|---|
| Active | Body makes antibodies |
| Passive | Ready-made antibodies given |
👉 Example: Mother’s milk (IgA)
💉 7. Vaccination
- Uses weakened/inactive pathogens
- Builds immunity memory
👉 Examples:
- Polio vaccine
- Hepatitis B vaccine
😷 8. AIDS
- Full form: Acquired Immuno Deficiency Syndrome
- Cause: HIV
Transmission:
- Unsafe sex
- Blood transfusion
- Shared needles
- Mother to child
👉 No complete cure, only prevention
⚠️ 9. Cancer
- Uncontrolled cell division
Types:
- Benign (non-spreading)
- Malignant (spreading → metastasis)
Causes:
- Radiation
- Tobacco
- Oncogenes
Treatment:
- Surgery
- Chemotherapy
- Radiotherapy
🚫 10. Drugs and Alcohol Abuse
Common Drugs:
- Heroin
- Marijuana
- Cocaine
Effects:
- Addiction
- Mental stress
- Organ damage
- Social problems
👨🎓 11. Causes of Drug Abuse
- Peer pressure
- Curiosity
- Stress
- Media influence
🧠 12. Addiction vs Dependence
- Addiction → psychological craving
- Dependence → withdrawal symptoms
🛑 13. Prevention
- Avoid bad company
- Proper education
- Healthy lifestyle
- Seek medical help
🌍 14. Public Health Measures
- Clean water
- Sanitation
- Vaccination
- Mosquito control
- Hygiene
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Class 12 Science Biology Chapter 7: Human Health and Disease Notes
Human Health and Disease
Class 12 Biology Chapter 7 – Pulse by Anubhav
Complete notes, NCERT book PDF aur updated syllabus yahan se easily access karo.
Yeh chapter human health, diseases, immunity, AIDS, cancer aur drug abuse jaise important topics ko simple way me explain karta hai — exams ke liye super important 🔥
Class 12 Biology Chapter 7 Human Health and Disease MCQs
Human Health and Disease (MCQs) – Pulse by Anubhav
1. Health is defined as:
A. Only physical fitness
B. Complete physical, mental and social well-being
C. Absence of disease only
D. Only mental health
2. Disease-causing organisms are called:
A. Hormones
B. Pathogens
C. Antibodies
D. Vectors
3. Malaria is caused by:
A. Virus
B. Protozoa
C. Bacteria
D. Fungi
4. Vector of malaria is:
A. Cockroach
B. Female Anopheles mosquito
C. Housefly
D. Male mosquito
5. Innate immunity is:
A. Developed after infection
B. Present from birth
C. Artificial immunity
D. Vaccine-based
6. Antibodies are produced by:
A. RBCs
B. B-lymphocytes
C. Platelets
D. T-lymphocytes
7. AIDS is caused by:
A. Protozoa
B. HIV
C. Bacteria
D. Fungus
8. Cancer cells show:
A. Controlled growth
B. Uncontrolled cell division
C. No division
D. Cell death
9. Vaccination provides:
A. Passive immunity
B. Active immunity
C. No immunity
D. Temporary immunity only
10. Addiction is:
A. Physical injury
B. Psychological dependence
C. Infection
D. Immunity
Score: 0 / 10
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FAQs About Human Health and Disease
Human Health and Disease – FAQs (Pulse by Anubhav)
What is health in biology?
Health is a state of complete physical, mental and social well-being, not just absence of disease.
What are infectious diseases?
Infectious diseases are diseases that spread from one person to another through pathogens like bacteria, viruses or parasites.
What causes malaria?
Malaria is caused by Plasmodium protozoa and spreads through the bite of infected female Anopheles mosquito.
What is immunity?
Immunity is the ability of the body to fight against disease-causing organisms.
What is AIDS?
AIDS is a disease caused by HIV that weakens the immune system and makes the body vulnerable to infections.
What is cancer?
Cancer is uncontrolled growth and division of cells that form tumors and may spread to other parts of the body.
How can diseases be prevented?
Diseases can be prevented by vaccination, maintaining hygiene, safe drinking water and healthy lifestyle.
Class 12 Biology Notes – All Chapters (Pulse by Anubhav)
| Chapter | Topic | Open |
|---|---|---|
| Chapter I | Sexual Reproduction in Flowering Plants | View → |
| Chapter II | Human Reproduction | View → |
| Chapter III | Reproductive Health | View → |
| Chapter IV | Principles of Inheritance and Variation | View → |
| Chapter V | Molecular Basis of Inheritance | View → |
| Chapter VI | Evolution | View → |
| Chapter VII | Human Health and Disease | View → |
| Chapter VIII | Microbes in Human Welfare | View → |
| Chapter IX | Biotechnology: Principles and Processes | View → |
| Chapter X | Biotechnology and its Applications | View → |
| Chapter XI | Organisms and Populations | View |
| Chapter XII | Ecosystem | View → |
| Chapter XIII | Biodiversity And Conservation | View → |