CBSE Sample Papers for Class 12 Biology

Previous years CBSE board questions of main exam and compartment exam including all sets of papers, set 1, 2, and 3. Download papers for better preparation of your exam. All the papers are based on latest NCERT Books and following the current CBSE Syllabus.

• Question Paper 2020-21
• Marking Scheme 2020-21
• Question Paper 2020
• Marking Scheme 2020
• Question Paper 2019
• Marking Scheme 2019
• Question Paper 2018
• Marking Scheme 2018
• Question Paper 2017
• Marking Scheme 2017
• Question Paper 2016
• Marking Scheme 2016

CBSE Board Exam Papers – 2018 Compartment Exams

• CBSE Board Paper Set – 1
• Set – 1 Solutions & Marking Scheme
• CBSE Board Paper Set – 2
• Set – 2 Solutions & Marking Scheme
• CBSE Board Paper Set – 3
• Set – 3 Solutions & Marking Scheme

CBSE Board Exam Papers – 2018 Main Exams

• CBSE Board Paper Set – 1
• Set – 1 Solutions & Marking Scheme
• CBSE Board Paper Set – 2
• Set – 2 Solutions & Marking Scheme
• CBSE Board Paper Set – 3
• Set – 3 Solutions & Marking Scheme

CBSE Board Exam Papers – 2017 Compartment Exams

Delhi Region

• Question Paper Set 1
• Question Paper Set 2
• Question Paper Set 3
• Answers & Marking Scheme Set 1, 2, 3

Outside Delhi (All India) Region

• Question Paper Set 1
• Question Paper Set 2
• Question Paper Set 3
• Answers & Marking Scheme Set 1, 2, 3

CBSE Board Exam Papers – 2017 Main Exams

• Delhi Set 1 Set 2 Set 3 Answers & Marking Scheme
  
• Outside Set 1 Set 2 Set 3 Answers & Marking Scheme
  
• Foreign Set 1 Set 2 Set 3 Answers & Marking Scheme

CBSE Board Exam Papers – 2016 Main Exams

• Delhi Set 1 Answer Set 1 Set 2 Answer Set 2 Set 3 Answer Set 3
• Outside Set 1 Answer Set 1 Set 2 Answer Set 2 Set 3 Answer Set 3
• Foreign Set 1 Answer Set 1 Set 2 Answer Set 2 Set 3 Answer Set 3

CBSE Board Exam Papers – 2015 Compartment Exams

• Delhi Set 1 Answer Set 1 Set 2 Answer Set 2 Set 3 Answer Set 3
• Outside Set 1 Answer Set 1 Set 2 Answer Set 2 Set 3 Answer Set 3

CBSE Board Exam Papers – 2015 Main Exams

• Delhi Set 1 Answer Set 1 Set 2 Answer Set 2 Set 3 Answer Set 3
• Outside Set 1 Answer Set 1 Set 2 Answer Set 2 Set 3 Answer Set 3
• Foreign Set 1 Answer Set 1 Set 2 Answer Set 2 Set 3 Answer Set 3

CBSE Board Exam Papers – 2014 Compartment Exams

• Delhi Set 1 Answer Set 1 Set 2 Answer Set 2 Set 3 Answer Set 3
• Outside Set 1 Answer Set 1 Set 2 Answer Set 2 Set 3 Answer Set 3

CBSE Board Exam Papers – 2014 Main Exams

• Delhi Set 1 Answer Set 1 Set 2 Answer Set 2 Set 3 Answer Set 3
• Outside Set 1 Answer Set 1 Set 2 Answer Set 2 Set 3 Answer Set 3
• Foreign Set 1 Answer Set 1 Set 2 Answer Set 2 Set 3 Answer Set 3

1. Your advice is sought to improve the nitrogen content of the soil to be used for cultivation of a non-leguminous terrestrial crop.
(a) Recommend two microbes that can enrich the soil with nitrogen.
(b) Why do leguminous crops not require such enrichment of the soil ?
2. Medically it is advised to all young mothers that breastfeeding is the best for their newborn babies. Do you agree ? Give reasons in support of your answer.
3. (a) How has the development of bioreactor helped in biotechnology ?
(b) Name the most commonly used bioreactor and describe its working.
4. (a) ‘‘India has greater ecosystem diversity than Norway.’’ Do you agree with the statement ? Give reasons in support of your answer.
(b) Write the difference between genetic biodiversity and species biodiversity that exists at all the levels of biological organisation.
5. Explain the effect on the characteristics of a river when urban sewage is discharged into it.
6. Looking at the deteriorating air quality because of air pollution in many cities of the country, the citizens are very much worried and concerned about their health. The doctors have declared health emergency in the cities where the air quality is very severely poor.
(a) Mention any two major causes of air pollution.
(b) Write any two harmful effects of air pollution to plants and humans.

1. A mature embryo-sac in a flowering plant may possess 7-cells, but 8-nuclei. Explain with the help of a diagram only.
2. During a medical investigation, an infant was found to possess an extra chromosome 21. Describe the symptoms the child is likely to develop later in the life.
3. A number of passengers were severely burnt beyond recognition during a train accident. Name and describe a modern technique that can help hand over the dead to their relatives.
4. What precaution(s) would you recommend to a patient requiring repeated blood transfusion? If the advise is not followed by the patient, there is an apprehension that the patient might contract a disease that would destroy the immune system of his/her body. Explain with the help of schematic diagram only how the immune system would get affected and destroyed.

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