How many chapters are in the CBSE Class 12 Biology syllabus?

The CBSE Class 12 Biology syllabus has 14 chapters covering 29 topics.

Is this syllabus free to access?

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14 chapters29 topics

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Previous year question papers

Free, official past papers for CBSE.

Important topics

Topics worth extra focus, based on real exam history, not a guess.

DNA Replication(Molecular Basis of Inheritance)
Genetics and Evolution is CBSE's single highest-weighted Class 12 Biology unit, 20 of 70 theory marks, the largest of the five official units, and pw.live/vedantu's CBSE Biology board-prep analyses repeatedly cite DNA replication as a tested sub-topic within it.
The Lac Operon (Gene Regulation)(Molecular Basis of Inheritance)
Same highest-weighted-unit grounding as DNA Replication above (Genetics and Evolution, 20 of 70 marks), pw.live/vedantu cite the lac operon as a tested sub-topic within it.
Hardy-Weinberg Principle(Evolution)
Same highest-weighted-unit grounding (Genetics and Evolution, 20 of 70 marks), pw.live/vedantu cite the Hardy-Weinberg principle as a tested sub-topic within it.