Is it correct to say: Confusing active immunity with passive immunity?

Active: body PRODUCES antibodies (vaccine). Passive: antibodies TRANSFERRED (colostrum, ATS).

Is it correct to say: Assuming HIV can be transmitted by casual contact?

HIV transmission requires exchange of body fluids (blood, semen, breast milk). NOT by handshake, saliva, air.

Is it correct to say: Writing cancer treatment as 'surgery only'?

Modern treatment combines surgery + radiotherapy + chemotherapy + immunotherapy.

Is it correct to say: Confusing IgG with IgM in terms of first response?

IgM is the FIRST antibody in immune response. IgG appears LATER in larger amount.

Is it correct to say: Naming Plasmodium as bacterium?

Plasmodium is a protozoan (unicellular eukaryote). Malaria is a protozoan disease.

Is it correct to say: Writing opioids from any plant?

Opioids come from Papaver somniferum (opium poppy). Cannabinoids from Cannabis sativa. Different plants.

Human Health and Diseases

Common diseases, immunity, AIDS, cancer, drugs — Maharashtra HSC Biology Ch 8

📐 10 formulas✏️ 3 examples🎯 5 practice⚖️ 4 marks🏫 Maharashtra State Board📚 Class 12✓ 2025–26 syllabus

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Board Exam Tips

→Types of immunity (innate vs acquired, active vs passive, humoral vs cell-mediated) is a Maharashtra HSC 3-marker every year.
→Structure of antibody (Y-shaped with 2 heavy + 2 light chains, antigen-binding site) — Balbharati asks a labelled diagram.
→AIDS: causative agent (HIV), stages, prevention — 3-marker classic. Learn NACO facts.
→Types of cancer (carcinoma, sarcoma, leukaemia, lymphoma) with definitions — 2-marker.
→Drug abuse — opioids, cannabinoids, cocaine — and their sources with plant names is a Balbharati-specific topic.

📐 Formulas(10)

Types of Immunity★ Board fav

Innate (nonspecific) vs Acquired (specific)

Active vs Passive Immunity★ Board fav

Active: body makes antibodies (vaccine, infection); Passive: preformed antibodies given (colostrum, ATS)

Types of Acquired Immunity★ Board fav

Humoral (antibody-mediated, B-cells) + Cell-mediated (T-cells)

Immunoglobulin Types

IgG, IgA, IgM, IgD, IgE

Antibody Structure★ Board fav

Y-shaped, 2 heavy chains (H₂) + 2 light chains (L₂), 2 antigen-binding sites

HIV Structure and Type★ Board fav

Retrovirus with RNA + reverse transcriptase; targets CD4+ T-cells

Cancer Types★ Board fav

Carcinoma (epithelial), Sarcoma (connective), Leukaemia (blood), Lymphoma (lymphoid)

Metastasis

Cancer cells detach and migrate to distant organs via blood/lymph

Common Diseases and Pathogens (Balbharati list)

Typhoid: S a l m o n e l l a, Pneumonia: S t r e pt ococc u s, Malaria: P l a s m o d i u m

Drugs of Abuse

Opioids: heroin (Papaver); Cannabinoids: cannabis; Cocaine: coca

✏️ Solved Examples

1Solved Exampleeasy4 steps

Differentiate between innate and acquired immunity giving two points each.

Innate immunity is present from birth and nonspecific.

Innate: present from birth, nonspecific

2Solved Exampleboard4 steps

Describe the mode of transmission and prevention of AIDS.

Causative agent: HIV — a retrovirus containing single-stranded RNA.

Virus: HIV (Human Immunodeficiency Virus)

3Solved ExampleHOTS5 steps

Discuss two therapeutic approaches to cancer and explain why cancer cells are difficult to treat.

Approach 1: Radiotherapy — ionising radiation kills rapidly dividing cells.

Radiation therapy: X-rays, γ-rays

⚠️ Traps & Common Mistakes

⚠️Common Mistakes6

1
Confusing active immunity with passive immunity
✓Active: body PRODUCES antibodies (vaccine). Passive: antibodies TRANSFERRED (colostrum, ATS).
2
Assuming HIV can be transmitted by casual contact
✓HIV transmission requires exchange of body fluids (blood, semen, breast milk). NOT by handshake, saliva, air.
3
Writing cancer treatment as 'surgery only'
✓Modern treatment combines surgery + radiotherapy + chemotherapy + immunotherapy.
4
Confusing IgG with IgM in terms of first response
✓IgM is the FIRST antibody in immune response. IgG appears LATER in larger amount.
5
Naming Plasmodium as bacterium
✓Plasmodium is a protozoan (unicellular eukaryote). Malaria is a protozoan disease.
6
Writing opioids from any plant
✓Opioids come from Papaver somniferum (opium poppy). Cannabinoids from Cannabis sativa. Different plants.

🎯 Practice Yourself

🎯Practice Yourself5 questions

Q1
Name the causative agent of typhoid.
Q2
Which cells are infected by HIV?
Q3
Give two examples of allergens.
Q4
Name the drug obtained from Cannabis sativa.
Q5
Define metastasis.

📝 Notes

Human Health and Disease — Maharashtra HSC Overview

Chapter 8 of the Balbharati Class 12 Biology textbook covers common diseases, immunity, AIDS, cancer, drug abuse, and lifestyle diseases.

Maharashtra syllabus specifics

Detailed immunity classification — innate vs acquired; humoral vs cell-mediated; active vs passive — Maharashtra HSC asks all three pairs.
Antibody structure with H₂L₂ formula and labelled diagram — Balbharati-specific 3-marker.
AIDS pathology and NACO measures in India — Maharashtra HSC 3-marker with local context.
Cancer types — Balbharati distinguishes carcinoma, sarcoma, leukaemia, lymphoma with definitions.
Drug abuse — Papaver, Cannabis, Erythroxylum (coca) — Balbharati-specific plant sources.
Common diseases table — bacterial (typhoid, pneumonia), viral (chickenpox), protozoan (malaria, amoebiasis), helminthic (ascariasis, filariasis), fungal (ringworm).