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ISC Class 12 Biology Chapter-Wise Weightage 2024

Check out the complete details regarding ISC Class 12 Biology Chapter-Wise Weightage 2024 below. Find here the breakdown of the marks distribution for the theory paper.

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ISC Class 12 Biology Chapter-Wise Weightage 2024: For Class 12, the Council for the Indian School Certificate Examinations (CISCE) has declared the unit-wise weightage for all major subjects and the same official weightage for units is detailed here. However, in regards to the chapter-wise weightage, it is based on the analysis of previous papers and is unofficial in nature. The chapter-wise marks distribution may have minor changes but the unit-wise distribution will strictly be followed in the question paper.

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ISC Class 12 Biology Chapter-Wise Weightage 2024

The total marks distribution for all units and their respective chapters is as follows:

Unit 1: Reproduction

Chapter NameTotal Weightage without optionsTotal Weightage with options
Sexual reproduction in flowering plants6 marks9 marks
Human Reproduction5 marks7 marks
Reproductive Health5 marks7 marks
Total16 marks23 marks

Unit 2: Genetics and Evolution

Chapter NameTotal Weightage without optionsTotal Weightage with options
Principles of inheritance and variation5 marks7 marks
Molecular basis of Inheritance4 marks6 marks
Evolution6 marks9 marks
Total15 marks22 marks

Unit 3: Biology and Human Welfare

Chapter NameTotal Weightage without optionsTotal Weightage with options
Human Health and Diseases8 marks11 marks
Microbes in Human Welfare6 marks8 marks
Total14 marks19 marks

Unit 4: Biotechnology and its Applications

Chapter NameTotal Weightage without optionsTotal Weightage with options
Biotechnology - Principles and processes5 marks7 marks
Biotechnology and its applications5 marks8 marks
Total10 marks15 marks

Unit 5: Ecology and Environment

Chapter NameTotal Weightage without optionsTotal Weightage with options
Organisms and Populations6 marks8 marks
Ecosystem4 marks6 marks
Biodiversity and its Conservation5 marks7 marks
Total15 marks21 marks


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