CBSE 2015 Biology Question Paper for Class 12

About this paper

This is the CBSE Class 12 Biology (Theory) question paper code 57/1/1 (Series SSO/1, Set 1) from the 2015 board examination. It carries 70 marks over three hours and has 26 compulsory questions in five sections, from one-mark very short answers to three five-mark long answers. Section D is a four-mark value-based question on the Swachh Bharat Abhiyan, asking for your views, two problems in carrying it out locally and two remedies. Other questions are set in everyday situations, such as cannabinoid vials found before a school sports meet and identifying the victims of a train collision. Internal choices are given in one two-mark question, one three-mark question and all three five-mark questions. This copy has the questions only, without answers.

Exam

CBSE Class 12

Subject

Biology

Year

2015

Paper code

57/1/1

Maximum marks

70

Time allowed

3 hours

Questions

26

Pages

9

Answers included

No, questions only

Paper pattern

• Section A

  5 marks

  Questions 1–5, very short answers, one mark each

• Section B

  10 marks

  Questions 6–10, short answers, two marks each; internal choice in one

• Section C

  36 marks

  Questions 11–22, short answers, three marks each; internal choice in one

• Section D

  4 marks

  Question 23, value-based question on the Swachh Bharat Abhiyan

• Section E

  15 marks

  Questions 24–26, long answers, five marks each, each with an internal choice

Topics covered

• Reproduction in flowering plants
• Human reproduction and reproductive health
• Principles of inheritance and variation
• Molecular basis of inheritance
• Evolution
• Human health and disease
• Strategies for enhancement in food production
• Microbes in human welfare
• Biotechnology and its applications
• Biodiversity and conservation
• Ecosystem and population

Questions from this paper

1. Name the transcriptionally active region of chromatin in a nucleus.
2. How has mutation breeding helped in improving the production of the mung bean crop?
3. A DNA segment has a total of 1000 nucleotides, 240 of which contain adenine. How many pyrimidine bases does this DNA segment possess? Draw a diagrammatic sketch of a portion of the segment to support your answer.
4. After a collision of two trains, many of the passengers killed are beyond recognition. Name a modern scientific method, and write its procedure, that would help identify their kinship so the bodies can be handed to relatives.
5. A flower of a tomato plant produces 240 viable seeds. What is the minimum number of pollen grains that must have been involved in the pollination of its pistil? Give a reason.
6. Explain the genetic basis of blood grouping in the human population.