CBSE Class 12 Biology Boards 2020 Question Paper Solved Set E

Access and download CBSE Class 12 Biology Boards 2020 Question Paper Solved Set E, carefully designed as per the latest 2025-26 examination guidelines issued by CBSE, NCERT, and KVS. These Class 12 Biology previous year question papers include detailed solutions, helping students to assess their performance and identify and improve key areas before the final exams.

Solved Biology Question Papers for Class 12

Practicing these Class 12 Biology question papers is the best way to understand the actual exam pattern and marking scheme. By solving these papers under timed conditions, Class 12 students can improve their speed and accuracy. Download the full CBSE Class 12 Biology Boards 2020 Question Paper Solved Set E to begin your self-assessment today.

Biology Class 12 Question Paper PDF with Solutions

SECTION – A
1. Which one of the following part of the plant when put into the soil is likely to produce new offspring ?
 
(a) Part of an internode
 
(b) A stem cutting with a node
 
(c) Part of a primary root
 
(d) A flower 
 
2. In a bacterium when RNA-polymerase binds to the promoter on a transcription unit during transcription, it
 
(a) terminates the process
 
(b) helps remove introns
 
(c) initiates the process
 
(d) inactivates the exons 
 
3. The hypothesis that “Life originated from pre-existing non-living organic molecules was proposed by
 
(a) Oparin and Haldane
 
(b) Louis Pasteur
 
(c) S.L. Miller
 
(d) Hugo de Vries 
 
4. Mating of a superior male of a breed of a cattle to a superior female of another breed is called
 
(a) in breeding
 
(b) out crossing
 
(c) out breeding
 
(d) cross breeding
 
Large-holes in ‘Swiss-Cheese’ are due to
 
(a) Propionibacterium sharmanii
 
(b) Saccharomyces cerevisae
 
(c) Penicillium chrysogenum
 
(d) Acetobacter aceti
 
5. Increased concentration of DDT in fish-eating birds is due to
 
(a) eutrophication
 
(b) bio-magnification
 
(c) cultural eutrophication
 
(d) accelerated eutrophication
OR
Species-Area relationship is represented on a log scale as
 
(a) hyperbola
 
(b) rectangular hyperbola
 
(c) linear
 
(d) inverted 
 
SECTION – B
6. State two advantages of an apomictic seed to a farmer.
 
7. Explain when is a genetic code said to be
 
(a) Degenerate
 
(b) Universal 
 
8. Differentiate between opioids and cannabinoids on the basis of their
 
(a) specific receptor site in human body.
 
(b) mode of action in human body.
 
9. (a) Name the two techniques employed to meet the increasing demand of fish in the world.
 
    (b) Name any two fresh water fishes. 
                  OR
Describe the contributions of Alexander Fleming, Ernest Chain and Howard Florey in the field of microbiology.
 
10. All cloning vectors do have a ‘selectable marker’. Describe its role in recombinant DNA-technology.
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CBSE Class 12 Biology Boards 2020 Question Paper Solved Set E

We hope you liked the above provided CBSE Class 12 Biology Boards 2020 Question Paper Solved Set E. To get an understanding of the type of questions which were asked in previous year exams, it is important for Class 12 students to refer to CBSE Class 12 Biology Boards 2020 Question Paper Solved Set E that we have provided above. Students can download all the Question Papers for Class 12 Biology which were issued in the exams so that you can practise them and solve all types of questions which have been asked till now. By doing all CBSE Class 12 Biology Boards 2020 Question Paper Solved Set E PYP (previous year papers) you will understand the regular questions and MCQ questions for Class 12 Biology which are always asked and learn them so that you can get full marks in those questions. You can download CBSE Class 12 Biology Previous Year Question Papers and Class 12 Biology Sample Papers in PDF. You should attempt all the last year question paper for Class 12 and Class 12 Biology MCQ Test in examination conditions at home and then compare their answers with the solutions provided by our teachers.

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