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CBSE Class 12 analysis of Biology syllabus and important sections

Among the Class 12th CBSE Science Stream students, Biology is considered especially polarizing as different students have different views about the subject. Some CBSE Class 12th students consider it especially difficult and some, on the other hand, consider it the most scoring than the other subjects. Whatever the consensus maybe, a Class 12th CBSE Biology student should have a really good understanding of his/her syllabus and work accordingly. Having a good grasp on the syllabus will help the student to develop an understanding of the syllabus and could also help to keep his/her preparation on track. While knowing the demarcation of the marks can help greatly, being aware of the Biology Syllabus is another. Knowing the Class 12th CBSE Biology can be helpful it will help the students to check their progress and work accordingly. A student aiming for all different type of results can plan effectively and move along with it. Scoring well in Biology CBSE Class 12th is especially important for students as it helps in a lot of competitive exams such as NEET and other medical exams. There is also an abundance of diagrams throughout the syllabus which makes it more difficult for students to memorize them. There are different elaborate concepts too which students consider hard to understand. The basic key to success in Biology CBSE Class 12th is the understanding of the syllabus and the understanding of the concepts themselves. Given below is the breakdown of the CBSE Biology Class 12th:

Unit Title Marks
VI Reproduction 14
VII Genetics and Evolution 18
VIII Biology and Human Welfare 14
IX Biotechnology and its Applications 10
X Ecology and Environment 14
Total 70


Important topics breakdown is given below:

Unit: Reproduction

Chapter 1 – Reproduction in Organisms

Important Topics:

  1. Modes of asexual reproduction


Chapter 2 – Sexual Reproduction in Flowering Plants

Important Topics:

  1. Pre-fertilisation Events
  2. Inbreeding depression
  3. Double fertilisation


Chapter 3 – Human Reproduction

Important Topics:

  1. Gametogenesis, Fertilisation and Events of Pregnancy


Chapter 4 – Reproductive Health

Important Topics:

  1. Birth control methods
  2. Sexually transmitted diseases
  3. Techniques to treat infertility


Unit: Genetics and Evolution

Chapter 5 – Principles of Inheritance and Variation

Important Topics:

  1. Mendel’s Laws
  2. Post-Mendelian Genetics
  3. Chromosomal Disorders and Pedigree analysis


Chapter 6 – Molecular Basis of Inheritance

Important Topics:

  1. Structure of DNA
  2. Experiments of F. Griffith, Hershey & Chase and Meselson & Stahl
  3. Mechanism- replication, transcription and translation
  4. Salient features of genetic code
  5. lac operon


Chapter 7 – Evolution

Important Topics:

  1. Homologous and analogous organs
  2. Adaptive radiation
  3. Hardy-Weinberg principle

Chapter 8 – Human Health and Disease
Unit: Biology in Human Welfare

Important Topics:

  1. Life cycle of Plasmodium
  2. Causative agents of different diseases and their mode of transmission
  3. Difference between innate and adaptive immunity
  4. AIDS and Drug Abuse


Chapter 9 – Strategies for Enhancement in Food Production

Important Topics:

  1. Inbreeding and outbreeding
  2. Single cell protein


Chapter 10 – Microbes in Human Welfare

Important Topics:

  1. Microbes and their products
  2. Sewage treatment
  3. Biogas production

Unit: Biotechnology

Chapter 11 – Biotechnology: Principles and Processes

Important Topics:

  1. Restriction enzymes
  2. Cloning vectors
  3. Transformation processes

Chapter 12 – Biotechnology and Its Applications

Important Topics:

  1. Bt cotton
  2. RNA interference
  3. Gene therapy
  4. Genetically engineered insulin


CBSE Class 12 analysis of Biology syllabus and important sections

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