NEET Biology · Human Health & Disease PYQ
NEET Human Health & Disease PYQ (2005–2025)
Human Health & Disease is a P1 NEET Biology chapter — ~4% weightage on trend, often 1–2 questions per paper. Covers pathogens, immune system, HIV/AIDS, cancer, drug abuse and vaccines. NCERT-line recall is non-negotiable — questions match NCERT phrasing closely.
Human Health & Disease PYQs spanning AIPMT 2005 to NEET 2025, tagged by sub-topic and difficulty. Every solution references NCERT Class 12 Chapter 7 specifics.
Human Health & Disease at a Glance
Key Sub-Topics & What's Tested
Pathogens & Common Diseases
Bacterial (typhoid, pneumonia, cholera), viral (common cold, AIDS, dengue), fungal (ringworm), protozoan (malaria, amoebiasis), helminthic (ascariasis, filariasis).
Innate Immunity
Physical barriers (skin, mucous membranes), physiological barriers (stomach acid, tears), cellular barriers (macrophages, neutrophils), cytokine barriers (interferons).
Acquired Immunity
Active (natural infection, vaccination) vs passive (antibodies from mother, anti-venom), primary vs secondary response, memory cells.
Immune System Cells & Molecules
B-lymphocytes produce antibodies. T-lymphocytes: helper (CD4), cytotoxic, suppressor. Antibody structure: 4 peptide chains (2 heavy + 2 light, H₂L₂).
HIV/AIDS
Retrovirus, attacks helper T-cells (CD4), transmission (sexual, blood, mother to child), pathogenesis, diagnostic tests (ELISA), treatment (antiretroviral).
Cancer
Benign vs malignant tumours, carcinogens (physical/chemical/biological), oncogenes, metastasis, cancer types (carcinoma, sarcoma, leukaemia), detection (biopsy, MRI, CT).
Drugs & Alcohol Abuse
Opioids (heroin), cannabinoids (marijuana), coca alkaloids (cocaine), stimulants (caffeine, tobacco), depressants, adolescent vulnerability, prevention.
Vaccines & Immunisation
Working principle, active immunity generation, types (inactivated, attenuated, toxoid, subunit), recombinant DNA vaccines, vaccine programs (polio, hepatitis B).
Question Type Distribution
| Question Type | Share (approx) | Example Pattern |
|---|---|---|
| Disease-Pathogen Matching | 25% | Match each disease with its causative agent: (1) malaria, (2) typhoid, (3) amoebiasis, (4) filariasis. |
| Immune System NCERT Recall | 25% | Antibody structure has how many polypeptide chains? (Answer: 4 — 2 heavy + 2 light) |
| HIV/AIDS Specifics | 15% | Which cell does HIV primarily attack? (Answer: CD4+ helper T-lymphocytes) |
| Cancer Types and Agents | 15% | Identify which is a biological carcinogen from given options. |
| Drug Abuse Classification | 10% | Classify heroin as opioid, cannabinoid or coca alkaloid. |
| Innate vs Acquired Immunity | 10% | Which of the following is an example of passive immunity? |
How to Solve Human Health & Disease PYQs
- 1Build a disease-pathogen table. Memorise: disease name, pathogen name, pathogen type (bacteria/virus/protozoa/etc.), transmission mode. NCERT Ch 7 has this table — memorise completely.
- 2Antibody structure: 4 chains, 2 types. Y-shaped molecule with 2 heavy chains + 2 light chains (H₂L₂). Antigen-binding sites at variable regions. Draw the diagram once.
- 3Vaccination principle: generate memory cells. Killed/attenuated pathogen → B cells produce antibodies → memory cells persist → faster secondary response on real exposure.
- 4Know HIV/AIDS specifics. Retrovirus, CD4+ target, ELISA diagnosis, World AIDS Day (Dec 1), transmission routes. NCERT Ch 7 details are tested verbatim.
- 5Cancer detection: match techniques. Biopsy (microscopic), MRI (soft tissue), CT (X-ray cross-sections), radioactive isotopes (thyroid cancer). NCERT summary suffices.
Common Mistakes That Cost Marks
- Confusing B-lymphocytes and T-lymphocytes. B-lymphocytes produce antibodies (humoral immunity). T-lymphocytes directly attack infected cells (cell-mediated). Different roles.
- Treating AIDS as caused by bacteria. HIV is a RETROVIRUS. Not a bacterium. Reverse transcriptase converts RNA to DNA in host cell.
- Wrong primary response duration. Primary immune response: slow, 1-2 weeks to peak. Secondary: rapid, hours to days, stronger. Don't reverse these.
- Classifying cocaine as opioid. Cocaine is a coca alkaloid (stimulant). Heroin is an opioid (from opium poppy). Different classes, different effects.
- Assuming benign tumours can metastasise. Only malignant tumours metastasise (spread to distant sites). Benign tumours are confined to original location.
Related NEET Practice
Frequently asked questions
How many Human Health & Disease PYQs should I solve?
Target 70–90 PYQs across AIPMT 2005 to NEET 2025. Given NCERT-recall density, focused practice quickly reaches very high accuracy in mocks.
Is NCERT Class 12 Chapter 7 enough?
Yes — NCERT Ch 7 covers the chapter completely. Read 3+ times for NTA-phrasing recall, pair with PYQs for context.
What's the most-tested Human Health & Disease pattern?
Disease-pathogen matching from a given list. Appears in nearly every NEET paper. Master the disease-pathogen table in NCERT.
Do I need to know drug molecular structures?
Not specific structures. Know the class (opioid, cannabinoid, coca alkaloid, stimulant, depressant) and the source plant/organism. NCERT has the summary table.
How many antibody types exist?
5 major classes: IgG (most abundant), IgM (first to appear), IgA (mucosal), IgE (allergy), IgD. NCERT mentions but doesn't deep-dive — know names and primary functions.
What's the difference between humoral and cell-mediated immunity?
Humoral: B cells produce antibodies that circulate in blood (humours = body fluids). Cell-mediated: T cells directly attack infected cells. Both are part of adaptive immunity.
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