Class 12 Biology — Chapter 7: Human Health and Disease
90 practice questions · 30 Easy · 30 Medium · 30 Hard
Practise Class 12 Biology Chapter 7, "Human Health and Disease", with 90 NCERT-aligned multiple-choice questions. The set is split into 30 Easy, 30 Medium and 30 Hard questions, so you can warm up on the fundamentals and then push into the exam-level problems that separate top scorers in CBSE Board exams and NEET UG.
"Human Health and Disease" is one of the chapters where diagram-based recall, terminology and NCERT line-by-line accuracy really pays off. Each MCQ on this chapter is timed and uses exam-grade marking (+2 correct, −1 wrong, 0 skipped), training the same accuracy-under-pressure that real papers demand. Every question carries a short explanation, so a wrong answer becomes a quick lesson rather than a dead end — the fastest way to close gaps before a test.
Use this chapter as targeted revision: attempt the Easy set first to confirm your basics on Human Health and Disease, then move to Medium and Hard to test application and problem-solving. Your accuracy, streaks and XP save automatically, and the chapter feeds into your overall Class 12 Biology mastery score. A few sample questions are shown below; sign in free to practise all 90.
Key concepts: Human Health and Disease (Class 12 Biology)
This chapter covers common human diseases and their pathogens, the immune system, AIDS and cancer, and the effects of drugs and alcohol.
- Pathogens & diseases
- Diseases are caused by bacteria (typhoid), viruses (common cold), protozoa (malaria — Plasmodium), worms and fungi; each has a mode of transmission.
- Immunity
- Innate (non-specific) and acquired (specific) immunity; acquired immunity is active (own antibodies) or passive (ready-made antibodies).
- Antibodies & vaccination
- Antibodies (immunoglobulins) are made by B-cells; vaccines provide immunological memory for active immunity.
- AIDS
- Caused by HIV, which destroys helper T-cells, weakening immunity; transmitted by blood, sexual contact and mother-to-child.
- Cancer & drug abuse
- Cancer is uncontrolled cell division (loss of contact inhibition); drug/alcohol abuse harms health and is addictive.
💡 Exam tips for Human Health and Disease
- Distinguish active immunity (slow, long-lasting, own antibodies) from passive immunity (fast, short-lived, ready-made).
- Malaria is caused by Plasmodium, transmitted by the female Anopheles mosquito — a classic exam fact.
Sample questions
Malaria is caused by:
Transmitted by Anopheles mosquito.
Pneumonia is caused by:
Bacterial infection of lungs.
HIV preferentially infects:
Weakens cell-mediated immunity.
Human Health and Disease — FAQs
What are the key concepts in Class 12 Biology Human Health and Disease?+
This chapter covers common human diseases and their pathogens, the immune system, AIDS and cancer, and the effects of drugs and alcohol. Key ideas include Pathogens & diseases, Immunity, Antibodies & vaccination, AIDS, Cancer & drug abuse.
What does Class 12 Biology Chapter 7 (Human Health and Disease) cover on XamBaaz?+
It covers 90 NCERT-aligned MCQs on "Human Health and Disease" — 30 Easy, 30 Medium and 30 Hard — each with a timed quiz and an instant explanation, suitable for CBSE Board exams and NEET UG.
Are these "Human Health and Disease" questions free to practise?+
Yes — sign in with Google to practise "Human Health and Disease" free. Full unlimited access is ₹999/year (limited-time launch price), with no per-chapter charges.
How should I revise "Human Health and Disease" for the exam?+
Start with the Easy quiz to confirm your fundamentals, then attempt Medium and Hard for application-level practice. Review each explanation, retry the questions you miss, and track your accuracy on this chapter until it is consistently high.
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