Class 12 Biology Chapter 7 Human Health and Disease is one of the highest-yield chapters for NEET, with 3 to 5 questions almost every year and a 3-mark labelled diagram in the CBSE Board paper. This Collegedunia formula sheet packs every incubation period, antibody class, tumour marker, and drug-effect figure from the 2026-27 NCERT into one revision page. Download the PDF below and use the quick-lookup tables for a focused 15-minute pass the night before your exam.
- CBSE Weightage: 6 to 7 marks
- NEET Weightage: 3 to 5 questions per year
- AIIMS / entrance overlap: 1 to 2 statement-based questions per paper
Human Health and Disease Video Lecture for Class 12 Biology
Source: Magnet Brains on YouTube
What is Inside the Human Health and Disease Formula Sheet?
The sheet covers 9 pages of quick-lookup tables for every memorisable number and abbreviation in NCERT Sections 7.1 to 7.5.
- 16 quick-lookup tables across pathogens, immunity, AIDS, cancer, and drug abuse
- 7 pathogens with incubation periods and vectors
- 5 antibody isotypes with NEET traps flagged
- 4 drug families with plant sources and effects
How will Collegedunia's Human Health and Disease Formula Sheet Help You?
The sheet is built for a 15 to 20 minute final-pass revision the night before a Biology paper.
- 2026-27 NCERT Alignment: Every incubation period, immune-cell figure, and drug name matches the current syllabus print of Sections 7.1 to 7.5.
- Quick-Lookup Tables: Content is split into pathogen, immunity, AIDS, cancer, and drug-abuse tables so students can pull the right number in under 15 seconds.
- NEET-First Numbers: Incubation periods, antibody isotypes, CD4 thresholds, and drug-source plants that NEET tests are flagged inline.
Human Health and Disease Symbol and Abbreviation Glossary for Class 12 Biology
The glossary below covers every abbreviation used in the master tables; confusing NACO with WHO or MALT with GALT loses 1-mark CBSE slips on Chapter 7.
| Abbreviation | Full Form | Note |
|---|---|---|
| HIV | Human Immunodeficiency Virus | Retrovirus; causes AIDS |
| AIDS | Acquired Immuno Deficiency Syndrome | Caused by HIV; not inherited |
| CMI | Cell-Mediated Immunity | T-lymphocyte driven |
| AMI | Antibody-Mediated Immunity | B-lymphocyte driven; humoral |
| MALT | Mucosa-Associated Lymphoid Tissue | 50% of body's lymphoid tissue |
| NACO | National AIDS Control Organisation | Indian; under Ministry of Health |
| ELISA | Enzyme-Linked Immuno-Sorbent Assay | HIV antibody test |
| PCR | Polymerase Chain Reaction | HIV nucleic acid test |
Incubation Periods and Vector Quick-Reference for Class 12th Biology
Incubation periods and vector pairings are a standing NEET favourite; the seven NCERT diseases are listed below.
| Disease | Pathogen Type | Vector / Route | Incubation | Site Affected |
|---|---|---|---|---|
| Typhoid | Bacterium | Faeco-oral (food, water) | 1 to 3 weeks | Small intestine |
| Pneumonia | Bacterium | Droplet / inhalation | 1 to 3 days | Alveoli of lungs |
| Common cold | Virus | Droplet / fomite | 3 to 4 days | Nose, respiratory passage (not lungs) |
| Malaria | Protozoan | Female Anopheles bite | 10 to 14 days | RBCs, liver |
| Amoebiasis | Protozoan | Housefly (mechanical); food, water | 2 to 4 weeks | Sigmoid colon, caecum |
| Ascariasis | Helminth | Faecal contamination of soil/water | About 2 months | Intestine; anaemia |
| Ringworm | Fungus | Contact (shared objects) | 4 to 14 days | Skin, scalp, nails |
Common cold does NOT affect the lungs (CBSE 1-mark recall). Amoebiasis vector is housefly (mechanical); malaria is Anopheles (biological) - NEET tests the swap.
Antibody Isotypes and Immunoglobulin Quick Card for 12th Biology
The five immunoglobulin isotypes appear in NEET MCQs every cycle; the table packages each one with its job and key hallmark.
| Isotype | Structure | Key Role | NEET Hallmark |
|---|---|---|---|
| IgG | Monomer | Most-common circulating antibody; crosses placenta | Only Ig to cross placenta (passive natural immunity to foetus) |
| IgM | Pentamer | First antibody in a primary response | Heaviest; agglutination champion |
| IgA | Monomer / Dimer | Secretions: saliva, tears, colostrum, mucus | Passive natural immunity to newborn |
| IgE | Monomer | Binds mast cells; triggers allergy (histamine release) | Lowest serum level; allergy + mast cell mediator |
Memory Hook: GAMED = G-placenta, A-colostrum, M-first, E-allergy, D-receptor.
HIV Replication and AIDS Quick-Lookup for Class 12 Biology
HIV is the most-tested entity in this chapter; the lookup card below collapses its biology, replication path, and lab tests into seven memorisable rows.
| Attribute | Value / Fact |
|---|---|
| Family | Retrovirus; lipid envelope, RNA genome |
| Key enzyme | Reverse transcriptase (RNA → DNA) |
| Entry point | Macrophage; viral DNA integrates into host DNA via integrase |
| Main target | Helper T-lymphocytes (CD4) |
| Incubation | A few months to 5 to 10 years |
| Diagnostic tests | ELISA (antibodies), PCR (nucleic acid), Western blot (confirmatory) |
| Treatment | Anti-retroviral drugs (AZT, etc.); prolongs life, not curative |
CBSE has set the HIV replication-cycle diagram (Fig 7.4) in 4 of the last 5 board papers. Master the 5-step loop for 3 of 3 marks.
Cancer Tumour Markers and Therapy Snapshot for Class 12 Biology
Cancer is a high-yield NEET MCQ source; the strip below covers tumour types and the four NCERT therapies.
| Attribute | Benign Tumour | Malignant Tumour |
|---|---|---|
| Growth | Slow; remains confined | Rapid; invades surrounding tissue |
| Contact inhibition | Retained | Lost |
| Metastasis | Absent | Present (blood / lymph spread) |
| Recurrence | Rare | Common |
| Threat | Generally not life-threatening | Often life-threatening |
The four NCERT-listed therapies are surgery, radiotherapy, chemotherapy, and α-interferon (immunotherapy). NEET tests the α-interferon role nearly every year.
Drugs and Alcohol Abuse Effect Table for 12th Biology
Section 7.5 contributes 1 to 2 NEET 1-marks every year; the card below maps each drug family to its plant source and dominant effect.
| Drug Family | Plant Source | Active Compound | Dominant Effect |
|---|---|---|---|
| Opioids | Latex of Papaver somniferum (opium poppy) | Morphine; heroin = diacetylmorphine | Depressant; slows body function |
| Cannabinoids | Inflorescences of Cannabis sativa | THC; products: marijuana, hashish, charas, ganja | Acts on cardiovascular system |
| Cocaine alkaloids | Coca plant (Erythroxylum coca; South America) | Cocaine (coke / crack) | Interferes with dopamine transport; CNS stimulant |
| Tobacco | Nicotiana tabacum | Nicotine | Stimulates adrenal; raises BP and heart rate; cancer link |
Top 5 Human Health and Disease NEET Recall Numbers Worth Memorising
The five facts below appear in NEET MCQs almost every year; lock them before any mock.
| Fact | Number / Pair | NCERT Section |
|---|---|---|
| Antibody isotype that crosses placenta | IgG (only one) | 7.2.4 |
| First antibody in primary response | IgM (pentamer) | 7.2.2 |
| Adolescence window (NCERT) | 12 to 18 years | 7.5.1 |
| AIDS incubation period | A few months to 5 to 10 years | 7.3 |
| NCERT count of essential drug families | 4 (opioids, cannabinoids, cocaine, tobacco) | 7.5 |
Human Health and Disease PYQ Recall Pattern Across CBSE and NEET
The three trends below show where CBSE and NEET have pulled from this chapter over the last three years.
| Trend | Where Tested | NCERT Section |
|---|---|---|
| Antibody H2L2 structure (3-mark labelled diagram) | CBSE 2025, NEET 2025 | 7.2 |
| HIV replication cycle and transmission routes | NEET 2025, CBSE 2024 | 7.3 |
| Plasmodium life cycle + vector control | NEET 2024, CBSE 2023 | 7.1 |
Class 12 Biology Chapter 7 Human Health and Disease: What Students Say
Student Feedback
- 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.
- Average student took 6.8 hours for the first read and 2.6 hours for a focused revision pass before the board exam.
- Only 33% attempted all 11 NCERT exercise questions; toppers revisited 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.
Other Resources for Human Health and Disease Class 12 Biology
| Resource | Link |
|---|---|
| Formula Sheet (this page) | Human Health and Disease Formula Sheet |
| NCERT Solutions | Human Health and Disease Class 12 Biology NCERT Solutions |
| Notes | Human Health and Disease Class 12 Biology Notes |
| NCERT Book PDF | Human Health and Disease Class 12 Biology NCERT Book PDF |
| Exemplar Solutions | Human Health and Disease Class 12 Biology Exemplar Solutions |
| Handwritten Notes | Human Health and Disease Class 12 Biology Handwritten Notes |
| Exemplar Book PDF | Human Health and Disease Class 12 Biology NCERT Exemplar Book PDF |
Formula Sheet for Class 12 Biology: All Chapters
The table below links every chapter of the Class 12 Biology NCERT to its dedicated formula sheet.
| Chapter | Resource |
|---|---|
| Chapter 1 | Sexual Reproduction in Flowering Plants Formula Sheet |
| Chapter 2 | Human Reproduction Formula Sheet |
| Chapter 3 | Reproductive Health Formula Sheet |
| Chapter 4 | Principles of Inheritance and Variation Formula Sheet |
| Chapter 5 | Molecular Basis of Inheritance Formula Sheet |
| Chapter 6 | Evolution Formula Sheet |
| Chapter 7 (this page) | Human Health and Disease Formula Sheet |
| Chapter 8 | Microbes in Human Welfare Formula Sheet |
| Chapter 9 | Biotechnology Principles and Processes Formula Sheet |
| Chapter 10 | Biotechnology and Its Applications Formula Sheet |
| Chapter 11 | Organisms and Populations Formula Sheet |
| Chapter 12 | Ecosystem Formula Sheet |
| Chapter 13 | Biodiversity and Conservation Formula Sheet |
Human Health and Disease Class 12 Biology Formula Sheet FAQs
Ques. What does the Human Health and Disease Class 12 Biology formula sheet cover?
Ans. The sheet collates every memorisable fact in NCERT Sections 7.1 to 7.5, including pathogens for the seven NCERT diseases, incubation periods, antibody isotypes (IgG, IgM, IgA, IgE, IgD), HIV replication path, tumour types, carcinogen classes, the four NCERT-listed cancer therapies, and the four drug families with their plant sources. The PDF is one printable revision page aligned to the 2026-27 NCERT.
Ques. Is this Class 12 Biology Chapter 7 formula sheet aligned with the 2026-27 NCERT?
Ans. Yes. Every entry in the sheet matches the current 2026-27 Reprint of NCERT Biology. Sections 7.1 through 7.5 are retained in full, and the sheet flags the four NCERT-defined drug families and the five antibody isotypes exactly as they appear in the latest edition.
Ques. How is this Human Health and Disease formula sheet useful for NEET preparation?
Ans. NEET asks 3 to 5 questions a year from this chapter, and almost all are recall-based: which antibody crosses the placenta, what is the incubation period of malaria, which plant gives heroin. The sheet packages those numbers in quick-lookup tables so a 15-minute pass the night before the paper covers nearly every common MCQ.
Ques. Which antibody isotype crosses the placenta?
Ans. Only IgG crosses the placenta. This is why it gives the foetus passive natural immunity. IgM is the largest (pentamer) and cannot cross. IgA is secreted in colostrum, IgE triggers allergy by binding mast cells, and IgD acts mainly as a B-cell receptor. NEET tests the IgG-placenta rule almost every year.
Ques. What is the incubation period of malaria as per NCERT Class 12 Biology?
Ans. NCERT lists 10 to 14 days as the typical incubation period for Plasmodium-driven malaria. The pathogen is transmitted by the female Anopheles mosquito, and the infective form passed into humans is the sporozoite. RBCs are the eventual target site, and P. falciparum is the malignant form.
Ques. What are the four drug families listed in NCERT Section 7.5?
Ans. NCERT names four drug families: opioids (from latex of Papaver somniferum; heroin / smack is diacetylmorphine), cannabinoids (from inflorescences of Cannabis sativa; marijuana, charas, ganja, hashish), cocaine (from the coca plant Erythroxylum coca; CNS stimulant that targets dopamine transport), and tobacco (Nicotiana tabacum; nicotine acts on the adrenal). NEET typically asks one product-to-plant pair every year.
Ques. What is the difference between addiction and dependence in NCERT Chapter 7?
Ans. Addiction is a psychological attachment to the drug, alcohol, or other addictive substance that drives a person to repeat use. Dependence is the body's adaptation, so abrupt cessation produces a withdrawal syndrome (anxiety, shakiness, nausea, sweating). Both can co-exist, and both are part of the NCERT Section 7.5.2 definition.
Ques. How many marks does Human Health and Disease carry in CBSE Class 12 Biology Boards?
Ans. Chapter 7 contributes around 6 to 7 marks in the CBSE Class 12 Biology board paper, typically split across a 3-mark labelled-diagram (most often antibody structure or HIV replication) and a 2 to 5 mark short or long answer on immunity, AIDS, cancer, or drug abuse.
Ques. What are the differences between active and passive immunity?
Ans. Active immunity is produced when the body makes its own antibodies after exposure to a live or attenuated pathogen (vaccination or natural infection); it is slow to develop but long-lasting. Passive immunity is gained when ready-made antibodies are introduced into the body (mother to foetus via IgG; antiserum after a snake bite); it acts quickly but does not last. NCERT Section 7.2.4 sets this up as a standard 2-mark differentiation question.
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