🌿 class 12 biology · chapter 7
Human Health and Disease
Human Health and Disease is Chapter 7 of Class 12 CBSE Biology, worth around 9 marks of the 70-mark board paper. It's a moderate-difficulty chapter — plan roughly 4 hours to cover it properly. Recent CBSE papers asked 10 questions from it, on Immunity, Vaccination, Malaria & Immunity, Cancer. Examiner's note: Disease → pathogen table + immunity types — memorise thoroughly.
Real board questions from this chapter
Differentiate between innate and acquired immunity. Explain humoral and cell-mediated immunity. What is the difference between active and passive immunity?
What is the principle of immunisation on which vaccination is based? What is a booster dose?
Describe the life cycle of Plasmodium in the human host and the mosquito vector. Why does the patient experience recurrent chills and fever?
Differentiate between benign and malignant tumours. What is metastasis? Name any two techniques used in the detection of cancer.
How does HIV replicate inside the human body after infection, and why does it lead to immunodeficiency?
Draw a labelled diagram of an antibody molecule. Explain its structure (heavy and light chains). Name any four types of antibodies produced in the human body.
Name the two types of drugs obtained from the plant Cannabis sativa and the flowering plant/latex Papaver somniferum. State one effect of each on the body.
Name the causative organism, one symptom and the mode of transmission for (i) typhoid, (ii) amoebiasis and (iii) filariasis.
Name the cells that act as the 'memory' of the immune system and enable a faster response on re-exposure to the same antigen.
What is an allergy? Name the antibodies and the chemicals released in the body that are responsible for allergic reactions.
Quick answers
How many marks is Human Health and Disease worth in the Class 12 board exam?
Around 9 marks of the 70-mark CBSE Biology theory paper, based on the official unit-wise weightage. Disease → pathogen table + immunity types — memorise thoroughly.
Is Human Health and Disease easy or hard?
It's rated medium — a moderate-difficulty chapter in Class 12 Biology. Most students need about 4 hours to cover it well.
What should I focus on in Human Health and Disease?
Going by the board papers themselves, the recurring areas are Immunity, Vaccination, Malaria & Immunity, Cancer, HIV / AIDS — that's where the marks actually sit.
What questions come from Human Health and Disease in board exams?
Between 2018–2024, CBSE board papers asked questions from this chapter on Immunity, Vaccination, Malaria & Immunity, Cancer — 1- to 5-mark questions.
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