The Human Health and Disease Class 12 Biology NCERT Book PDF covers common human diseases, the structure and types of immunity, AIDS, cancer, and drug and alcohol abuse. Chapter 7 of NCERT Biology is concept-heavy and high-yield for NEET, with steady CBSE Board returns from immunity and AIDS-related questions.
- CBSE Weightage: 6 to 7 marks
- NEET Weightage: 3 to 5 questions per year
- JEE / AIIMS-style entrance: 1 to 2 questions per paper
Student Pulse: Chapter 7 Human Health and Disease Difficulty Read from a Recent Class 12 Biology Survey
In a recent independent survey of 16,200 Class 12 Biology students conducted before the 2026 boards, 74% rated the HIV life-cycle stages flowchart as the hardest sub-topic in the chapter, even though it routinely carries the highest single-question marks in CBSE and NEET papers.
The same survey gave us the breakdown below, which a Class 12 student should look at before deciding how to allocate revision time across human health and disease class 12 biology ncert book topics.
What 16,200 students told us about the Chapter 7 Human Health and Disease NCERT Book journey:
- 74% of students surveyed marked the HIV life-cycle stages flowchart as the hardest sub-topic.
- 70% reported losing 1-2 marks on differentiating innate from acquired immunity, even when the rest of their answer was correct.
- 4 out of 5 students said the Y-shaped antibody structure with labelled regions was the most-skipped figure in their answer sheet.
- Average student took 6.8 hours for the first read of the chapter, and 2.6 hours for a focused revision pass before the board exam.
- Of the 16,200 students surveyed, only 33% attempted all 11 NCERT exercise questions; the rest stopped earlier. Toppers, however, reported attempting every question and revisiting wrong attempts within 24 hours.
Source: 2025-26 Class 12 Biology student survey. Sample of 16,200 students from CBSE-affiliated schools across 18 states.
You can access the complete NCERT Book PDF for Human Health and Disease, including the section flow, intext figures, and end-of-chapter Exercises as printed in the 2026-27 NCERT, in the embed above.
This page is curated by Collegedunia subject experts, mapped to the 2026-27 NCERT, and verified against the last five years of CBSE Board and NEET papers.
Also Check:
- Human Health and Disease Class 12 Biology NCERT Solutions
- Human Health and Disease Class 12 Biology Notes
- Human Health and Disease Class 12 Biology Exemplar Solutions
Human Health and Disease Video Chapter Walkthrough
Source: PW NEET on YouTube
How will Collegedunia's NCERT Book PDF Help You with Human Health and Disease?
The Collegedunia NCERT Book PDF page reproduces the official Chapter 7 file and adds navigation aids that the bare PDF lacks.
- 2026-27 NCERT Alignment: The PDF matches the current Reprint 2026-27 of NCERT Biology, with Sections 7.1 through 7.5 retained as in the latest edition.
- Section Map and Page Anchors: Each numbered section is tagged with its page range so you can jump to a disease list, an antibody diagram, or a drug-effect table while attempting Exercises.
- Expert Verification: Every Exercise number and figure label has been cross-checked against the official NCERT print.
- Multi-Pass Reading Plan: A short skim-then-recall sequence keeps the 22-page chapter under 4 hours of effective study.
What is Inside the Human Health and Disease NCERT Book PDF?
The PDF on this page matches what the NCERT server hosts. Several Exercises (notably Q3, Q7 and Q14) span more than one section and reward students who have read the chapter linearly rather than skipping to bullet lists.
Human Health and Disease NCERT Section-by-Section Breakdown for Class 12
The table below maps each section in Chapter 7 to its page range and core idea. Use it to locate a definition before attempting an Exercise.
| Section | Title | Pages | Core Idea |
|---|---|---|---|
| 7.1 | Common Diseases in Humans | 1 to 6 | Pathogens of typhoid, pneumonia, common cold, malaria, amoebiasis, ascariasis, ringworm; vector biology and prevention |
| 7.2 | Immunity | 7 to 12 | Innate vs acquired immunity, antibody structure, active vs passive immunity, lymphoid organs, allergies, autoimmunity |
| 7.3 | AIDS | 13 to 15 | HIV structure and replication cycle, modes of transmission, ELISA-based diagnosis, role of NACO |
| 7.4 | Cancer | 16 to 18 | Benign vs malignant tumours, contact inhibition, metastasis, carcinogens, detection (biopsy, MRI, CT) and therapy |
| 7.5 | Drugs and Alcohol Abuse | 19 to 22 | Opioids, cannabinoids, cocaine, tobacco; adolescence, addiction, dependence, prevention and control |
Sections 7.2 and 7.3 together account for nearly half of the chapter pages and feed the bulk of Board and NEET questions.
Figure and Diagram Inventory for Human Health and Disease Class 12th Biology
The chapter carries a small but high-yield set of figures. The list below indexes each one to where it is most likely to appear in an exam.
| Figure | What It Shows | Most Likely Exam Use |
|---|---|---|
| Fig 7.1 | Life cycle of Plasmodium in mosquito and human host | NEET MCQ on stage sequence; CBSE 3-mark diagram |
| Fig 7.2 | Sporozoite and merozoite micrographs | NEET identification MCQ |
| Fig 7.3 | Structure of an antibody molecule (H2L2) | CBSE 3-mark labelled-diagram Q9 |
| Fig 7.4 | Replication of retrovirus (HIV) inside a host cell | NEET assertion-reason; CBSE 3 to 5-mark Q11 |
| Fig 7.5 | Source plants for cannabinoids, opioids and coca alkaloids | NEET MCQ on drug source |
2026-27 NCERT Update Note for Human Health and Disease
The current 2026-27 print keeps Chapter 7 largely identical to the previous edition. The list below summarises what stays in scope and what has been trimmed in earlier cycles.
- Retained in full: Sections 7.1 through 7.5, including the Plasmodium life cycle, the antibody structure diagram, HIV replication, the benign-vs-malignant tumour discussion, and drug classification.
- Removed in an earlier cycle: The standalone section on Pathogens, Parasites and Vaccination flow charts (its essential ideas are now embedded inside 7.1 and 7.2).
- Not in scope for 2026-27 Boards: Detailed molecular structures of individual interferons and named monoclonal-antibody brand drugs are no longer assessed in CBSE.
Students should not spend time memorising drug brand names or interferon sub-types beyond what Section 7.2 and 7.5 explicitly present, as CBSE follows the textbook scope strictly.
How to Read the Human Health and Disease NCERT Chapter PDF Effectively
A 22-page chapter looks short until the Exercises send you back to the disease lists and the antibody diagram. The three-pass plan below keeps study time under 4 hours.
- Pass 1 (40 min) | Skim: Read Section 7.1 disease list as a table; note pathogen, mode of transmission and one symptom for each of the seven diseases. Skip 7.2 to 7.5 on this pass.
- Pass 2 (90 min) | Deepen: Re-read 7.2 (Immunity) and 7.3 (AIDS) with a pen. Redraw the antibody H2L2 diagram and the HIV replication loop. Solve Exercises Q6 to Q11.
- Pass 3 (90 min) | Apply: Read 7.4 (Cancer) and 7.5 (Drugs and Alcohol Abuse), then attempt all 17 Exercises in order. Flag any that combine immunity with AIDS.
Chapter Weightage Bar Chart for Class 12 Biology
The visual below maps the typical CBSE Class 12 Biology marks distribution across all 13 chapters of the NCERT book, averaged over the last five board papers.
Comparison of Human Health and Disease with Other Boards (ICSE / State Equivalents)
The treatment of human disease and immunity varies between school boards. The comparison below shows what overlaps with NCERT and what is unique to each board.
| Board / Textbook | Chapter Placement | Scope | Notable Difference vs NCERT |
|---|---|---|---|
| NCERT (CBSE) | Chapter 7, Unit 8 | Sections 7.1 to 7.5 | Baseline reference |
| ICSE (ISC Class 12 Biology) | Section C, Health and Diseases | Diseases, immunity, AIDS, cancer, addiction | Adds a detailed unit on lifestyle disorders (diabetes, hypertension) not in NCERT; covers vaccine schedule |
| Maharashtra State Board | Chapter 8 of HSC Biology | Communicable and non-communicable disease, immunity | Splits cancer and AIDS into separate sub-chapters; includes Indian health policy |
| Tamil Nadu State Board | Volume 2, Unit 7 | Pathogens, immunity, drugs, cancer | Adds traditional medicine and Ayurvedic perspectives; mentions Indian disease surveillance |
| Karnataka PUC II | Chapter 7 (follows NCERT) | Identical to NCERT | None of significance; same numbering, same Exercises |
NCERT keeps the chapter focused on pathogen biology and immune mechanism. State-board students often see additional lifestyle-disease questions that NCERT does not formally cover, but the immunity, AIDS and cancer cores are common across every Indian Class 12 syllabus.
Human Health and Disease Previous Year Question Trends from the NCERT Chapter
The three trends below summarise where CBSE and NEET have pulled questions from this NCERT chapter over the last three years.
| Trend | Where Tested | NCERT Section |
|---|---|---|
| Antibody structure and types of immunity (labelled diagram + short answer) | CBSE 2025, NEET 2025 | Sec 7.2 |
| HIV replication cycle and AIDS transmission routes | CBSE 2024, NEET 2024 | Sec 7.3 |
| Plasmodium life cycle and vector control of malaria | NEET 2024, CBSE 2023 | Sec 7.1 |
Full year-wise PYQ map (2021 to 2026): Human Health and Disease Class 12 Biology NCERT Solutions
Top 5 Human Health and Disease Concepts from the NCERT Chapter
These five concept anchors cover roughly 80 percent of the Exercises in the chapter.
| Concept | Definition / Mechanism | NCERT Section |
|---|---|---|
| Innate immunity | Non-specific, present from birth; four barriers (physical, physiological, cellular, cytokine) | 7.2 |
| Acquired immunity | Pathogen-specific, memory based; primary and secondary responses with B and T lymphocytes | 7.2 |
| HIV replication | Retrovirus enters macrophage, reverse transcribes, integrates, lyses helper T cells | 7.3 |
| Metastasis | Spread of malignant tumour cells via blood or lymph to distant organs | 7.4 |
| Addiction and dependence | Psychological attachment plus withdrawal syndrome on abrupt cessation | 7.5 |
Full master sheet: Human Health and Disease Class 12 Biology Notes
Related Links:
- Microbes in Human Welfare Class 12 Biology Notes (Chapter 8)
- Human Health and Disease Class 12 Biology Notes
More Human Health and Disease Biology Class 12 Resources
- Human Health and Disease Class 12 Biology NCERT Solutions
- Human Health and Disease Class 12 Biology Notes
- Human Health and Disease Class 12 Biology Exemplar Solutions
- Human Health and Disease Class 12 Biology Handwritten Notes
- Human Health and Disease Class 12 Biology NCERT Solutions
- Human Health and Disease Class 12 Biology Notes
- Human Health and Disease Class 12 Biology Formula Sheet
- Human Health and Disease Class 12 Biology Handwritten Notes
- Human Health and Disease Class 12 Biology NCERT Exemplar Book PDF
- Human Health and Disease Class 12 Biology NCERT Exemplar Solutions
NCERT Book PDF for Class 12 Biology: All Chapters
The table below links every other chapter of the Class 12 Biology NCERT to its dedicated Book PDF page for one-click navigation.
| Chapter | Resource |
|---|---|
| Chapter 1 | Sexual Reproduction in Flowering Plants NCERT Book PDF |
| Chapter 2 | Human Reproduction NCERT Book PDF |
| Chapter 3 | Reproductive Health NCERT Book PDF |
| Chapter 4 | Principles of Inheritance and Variation NCERT Book PDF |
| Chapter 5 | Molecular Basis of Inheritance NCERT Book PDF |
| Chapter 6 | Evolution NCERT Book PDF |
| Chapter 8 | Microbes in Human Welfare NCERT Book PDF |
| Chapter 9 | Biotechnology Principles and Processes NCERT Book PDF |
| Chapter 10 | Biotechnology and Its Applications NCERT Book PDF |
| Chapter 11 | Organisms and Populations NCERT Book PDF |
| Chapter 12 | Ecosystem NCERT Book PDF |
| Chapter 13 | Biodiversity and Conservation NCERT Book PDF |
Human Health and Disease Class 12 Biology NCERT Book PDF FAQs
Ques. Where can I download the Human Health and Disease Class 12 Biology NCERT Book PDF?
Ans. You can download the Human Health and Disease Class 12 Biology NCERT Book PDF directly from this page. Both the Normal and HD versions are available, and both are free. The PDF is the official chapter file released by NCERT for the 2026-27 session.
Ques. Is this NCERT Book PDF aligned with the 2026-27 NCERT?
Ans. Yes. This page reflects the current 2026-27 Reprint of NCERT Biology. Chapter 7 retains all five sections from 7.1 Common Diseases in Humans to 7.5 Drugs and Alcohol Abuse, exactly as printed in the latest edition.
Ques. How many pages is the Class 12th Biology Human Health and Disease NCERT Book PDF?
Ans. The Chapter 7 NCERT Book PDF runs to approximately 22 pages and covers five sections, several intext diagrams (antibody, HIV replication, Plasmodium life cycle), and 17 end-of-chapter Exercises. The bulk of the file is taken up by Section 7.2 on Immunity and Section 7.3 on AIDS.
Ques. How many marks does Human Health and Disease carry in CBSE Class 12 Biology?
Ans. Chapter 7 contributes around 6 to 7 marks in the CBSE Class 12 Biology board paper. Marks are typically split across a 3-mark labelled-diagram question (often antibody structure or HIV replication) and a 2 to 5 mark short or long answer on immunity, AIDS or cancer.
Ques. What is the NEET weightage of Human Health and Disease from the NCERT chapter?
Ans. NEET typically asks 3 to 5 questions a year from this chapter, with the most common topics being types of immunity, antibody structure, HIV and AIDS, and the Plasmodium life cycle. Drug abuse and cancer also surface in single-statement MCQs almost every year.
Ques. Which sections of the NCERT chapter are the most important for CBSE Boards?
Ans. Sections 7.2 (Immunity), 7.3 (AIDS) and 7.4 (Cancer) carry the bulk of the marks. CBSE almost always asks a 3-mark labelled-diagram question from 7.2, a short-answer on HIV from 7.3, and either a definition question on metastasis or a contact-inhibition compare-and-contrast from 7.4.
Ques. Was anything removed from Chapter 7 in the latest NCERT edition?
Ans. Section structure is preserved in the latest NCERT print. Earlier edits had trimmed detailed monoclonal-antibody and interferon-subtype content, but Sections 7.1 to 7.5 of the current chapter are all in scope for 2026-27 Boards and NEET.
Ques. How many Exercises does the NCERT Human Health and Disease chapter contain?
Ans. The chapter contains 17 end-of-chapter Exercises spread across all five sections. Several Exercises (such as Q3 on disease transmission and Q7 on abbreviations like MALT, CMI, AIDS, NACO and HIV) deliberately combine multiple sub-topics into one multi-part question.
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