NCERT Solutions for Class 12 Biology Chapter 7: Human Health and Disease
Chapter 7 covers the biological basis of common diseases, the immune system, and issues like drug and alcohol abuse, connecting biology directly to everyday health awareness. Myclass24's NCERT Solutions for this chapter are written to be immediately useful for both exams and general health literacy, presenting causes, symptoms, and prevention in a structured, easy-to-recall format that students can also carry forward as useful general knowledge beyond the exam itself. Students must check all subjects NCERT solutions for Class 12 and all the chapters of NCERT solutions for class 12 Biology.
Find the PDF of NCERT Solutions for Class 12 Biology Chapter 7
The PDF version of these solutions on Myclass24 organizes diseases by category, parasitic, bacterial, viral, and so on, exactly as the NCERT textbook does, and adds the immune system and substance abuse sections separately, making it simple for a student to jump straight to the exact topic needed for quick revision before an exam.
Chapter Details
Chapter Number | Chapter 7 |
Chapter Name | Human Health and Disease |
Class | 12 |
Subject | Biology |
Unit | Biology in Human Welfare |
Total Questions Covered | All NCERT in-text and exercise questions |
Key Topics | Immunity, common diseases, cancer, drug and alcohol abuse |
Approx. Weightage in Boards | 5 to 7 marks |
Turning a Fact-Heavy Chapter Into an Easy Revision Topic
Human Health and Disease contains a large number of individually small facts, which makes it easy to forget specific details under exam pressure. Myclass24's solutions tackle this by grouping diseases consistently under causative agent, mode of transmission, symptoms, and prevention, the exact structure that NCERT exercise questions tend to follow, so students can answer methodically instead of trying to recall scattered facts.
The immune system section, covering innate and acquired immunity along with active and passive immunisation, is conceptually rich despite its short length in the textbook. The solutions are careful to distinguish active immunity, where the body produces its own antibodies, from passive immunity, where ready-made antibodies are introduced, since this distinction is a recurring point of confusion in written answers.
What are the topics covered in the NCERT Solutions for Class 12 Biology Chapter 7: Human Health and Disease
Cancer, while only a small part of the chapter, is treated by examiners as a high-value topic because it connects to cell biology concepts from earlier chapters. Myclass24's solutions explain the basic difference between benign and malignant tumours and outline common detection and treatment methods in language that stays factual and appropriately serious.
AIDS is another disease the chapter covers in detail, given its significance in public health education. The solutions explain the mode of transmission and prevention clearly and factually, matching the tone the NCERT textbook itself uses, so that students can write confident, exam-appropriate answers on this sensitive topic.
The final section on drug and alcohol abuse, including the biological effects of common substances and the importance of awareness and rehabilitation, is often tested through short or value-based questions. Myclass24's solutions keep this section direct and factual, helping students answer clearly while reinforcing accurate health information rather than vague generalisations.
Since this chapter is the last one in the unit on Biology in Human Welfare, Myclass24 also suggests revising it alongside basic awareness of common preventive healthcare practices discussed in class, since board papers sometimes frame a question around a real-life scenario, such as recommending preventive steps for a particular illness, rather than asking for a textbook definition outright.
Allergies and autoimmunity, briefly introduced within the immune system section, are easy to overlook but occasionally appear in short-answer questions asking students to define these terms with a simple example. Myclass24's solutions include a short, precise explanation for both, ensuring that even these smaller subtopics are not left out of a student's overall preparation for this chapter.