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Human Health and Diseases

Maharashtra Board · Class 12 · Biology

Quick revision notes for Human Health and Diseases — Maharashtra Board Class 12 Biology. Key concepts, formulas, and definitions for last-minute revision.

45 questions20 flashcards5 concepts

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Key Topics to Revise

1

Immunity and Immune System

  • Immunity is the resistance exhibited by host towards injury caused by pathogens and their products
  • Immune system distinguishes between self (body's own cells) and non-self (foreign molecules)
  • Antigens are foreign substances that stimulate immune response; Antibodies are protective chemicals produced against antigens
2

Antibody Structure and Function

  • Antibodies are Y-shaped glycoprotein molecules also called Immunoglobulins (Igs)
  • Structure: 4 polypeptide chains - 2 heavy chains and 2 light chains held by disulfide bonds
  • Variable regions form antigen-binding sites (paratopes) - provide specificity
3

Blood Groups and Compatibility

  • ABO blood groups discovered by Karl Landsteiner (1900) - Nobel Prize winner
  • Four blood groups: A, B, AB, O based on presence/absence of A and B antigens on RBCs
  • Blood group A: Antigen A on RBCs, antibody b in plasma
4

Common Infectious Diseases

  • Malaria: Caused by Plasmodium (P. vivax, P. ovale, P. malariae, P. falciparum), transmitted by female Anopheles mosquito
  • Malaria symptoms: Cyclic fever, chills, sweating, headache, anaemia, hepatomegaly
  • Amoebiasis: Caused by Entamoeba histolytica, transmitted through faeco-oral route

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Full Notes

Key Concepts

Immunity is the body's abilityAntibodies are YABO blood groups are determined byCommunicable diseases caused by pathogens (bacteriaCancer results from uncontrolled cell division

Frequently Asked Questions

What are the important topics in Human Health and Diseases for Maharashtra Board Class 12 Biology?
Human Health and Diseases covers several key topics that are frequently asked in Maharashtra Board Class 12 board exams. Focus on the core concepts listed on this page and practise related questions to build confidence.
How to score full marks in Human Health and Diseases — Maharashtra Board Class 12 Biology?
Understand the core concepts first, then work through the 45 practice questions available for this chapter. Revise formulas and definitions regularly, and use flashcards for quick recall before the exam.

Sources & Official References

Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.

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