CBSE Class 12 Biology Boards 2020 Question Paper Set 05 Solved

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Previous Year Question Papers for Class 12 Biology

Explore authentic exam materials through the CBSE Class 12 Biology Boards 2020 Question Paper Set 05 Solved. Tailored for Class 12 learners, utilizing these Biology previous year papers ensures thorough preparation and strengthens time management skills before final CBSE evaluations.

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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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Download CBSE Class 12 Biology Boards 2020 Question Paper Set 05 Solved for Class 12 Biology

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Where can I download the official PDF for CBSE Class 12 Biology Boards 2020 Question Paper Set 05 Solved?

The CBSE Class 12 Biology Boards 2020 Question Paper Set 05 Solved is available for download on StudiesToday.com. It includes complete set with all sections so that Class 12 students can practice with the exact same paper that came in the CBSE exams.

Are the solutions for CBSE Class 12 Biology Boards 2020 Question Paper Set 05 Solved based on the official CBSE marking scheme?

Yes, the solutions for CBSE Class 12 Biology Boards 2020 Question Paper Set 05 Solved are prepared by subject matter experts as per official marking scheme. Class 12 students will understand the structure of answers and 'step-marks' methodology Biology.

How does solving CBSE Class 12 Biology Boards 2020 Question Paper Set 05 Solved help in preparing for the 2026 exams?

Solving previous year papers like CBSE Class 12 Biology Boards 2020 Question Paper Set 05 Solved is important to understand repeat themes and question difficulty levels of Biology. It helps Class 12 students to test their time management skills too.

Can I access CBSE Class 12 Biology Boards 2020 Question Paper Set 05 Solved in different languages?

Yes, where applicable, CBSE Class 12 Biology Boards 2020 Question Paper Set 05 Solved is available in both English and Hindi mediums. All students from Class 12 can access Biology study material in their preferred language.

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