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Class 12 Biology — chapter-wise guide
All 14 chapters of the CBSE Class 12 Biology syllabus with their approximate board weightage (out of 70 theory marks), difficulty, and realistic study hours. Tap a chapter for its past board questions and what to focus on.
Weightage shown is for the 70-mark theory paper; practicals carry the other 30.
Ch 1Sexual Reproduction in Flowering Plants~6 marks · 4 hrs · 10 PYQsmediumCh 2Human Reproduction~6 marks · 4 hrs · 10 PYQsmediumCh 3Reproductive Health~4 marks · 2 hrs · 8 PYQseasyCh 4Principles of Inheritance and Variation~7 marks · 6 hrs · 10 PYQshardCh 5Molecular Basis of Inheritance~8 marks · 6 hrs · 10 PYQshardCh 6Evolution~5 marks · 4 hrs · 9 PYQsmediumCh 7Human Health and Disease~7 marks · 4 hrs · 10 PYQsmediumCh 8Microbes in Human Welfare~5 marks · 2 hrs · 8 PYQseasyCh 9Biotechnology: Principles and Processes~6 marks · 4 hrs · 10 PYQshardCh 10Biotechnology and its Applications~6 marks · 4 hrs · 9 PYQsmediumCh 11Organisms and Populations~4 marks · 3 hrs · 8 PYQsmediumCh 12Ecosystem~3 marks · 3 hrs · 8 PYQsmediumCh 13Biodiversity and Conservation~3 marks · 2 hrs · 8 PYQseasyCh 14Environmental Issues~0 marks · 2 hrs · 8 PYQseasy
Stuck on any of these? Arya explains biology till it clicks — free to start.
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