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CBSE Class XII Biology Exam Pattern

Check out for CBSE Class XII Biology Exam Pattern, Question Paper Scheme, Chapter wise questions distribution and Marking scheme.

This video includes CBSE Class XII Biology Question Paper Scheme, Chapter wise questions distribution and Marking scheme:-


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The weightage of the distribution of marks over different dimensions of the Biology question paper shall be as follows:

Weigthtage to content/subject units

Units Content Marks
1. Reproduction 14
2. Genetics and evolution 18
3. Biology and Human Welfare 14
4. Biotechnology and its applications 10
5. Ecology and environment 14
Total 70


Weightage to different form of questions
S. No. Form of Questions Marks for each No. of Total Marks
1. Very Short Answer(VSA) 1 8 08
2. Short Answer (SAII) 2 10 20
3. Short Answer (SAI) 3 09 27
4. Long Answer (LA) 5 3 15
TOTAL 30 70

Scheme of Options

  1. There will be no overall option.
  2. Internal choices (either/or type) on a very selective basis has been provided. This choice has been given in one question of 2 marks, one question of 3 marks and all the three questions of 5 marks weightage.

Weightage to difficulty level of questions:-

S.No. Estimated difficulty level Percentage
1. Easy 15
2. Average 70
3. difficult 15

About 20% weightage has been assigned to questions testing higher order thinking skills of learners.

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