CBSE Class 12 Biology Sample Paper 2020 Set 01 Solved

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Sample Question Papers for Class 12 Biology

Explore authentic exam practice materials through the CBSE Class 12 Biology Sample Paper 2020 Set 01 Solved. Tailored for Class 12 learners, utilizing these Biology sample papers ensures thorough preparation and strengthens time management skills before final CBSE evaluations.

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CBSE Class 12 Biology Sample Paper 2020 Solved Set A. CBSE issues sample papers every year for students for Class 12 board exams. Students should solve the CBSE issued sample papers to understand the pattern of the question paper which will come in class 12 board exams this year. The sample papers have been provided with marking scheme. It’s always recommended to practice as many CBSE sample papers as possible before the board examinations. Sample papers should be always practiced in examination condition at home or school and the student should show the answers to teachers for checking or compare with the answers provided. Students can download the sample papers in pdf format free and score better marks in examinations. Refer to other links too for latest sample papers.

Section A

1 Scientists have succeeded in recovering healthy sugarcane plants from a diseased one

a) Name the part of the plant used as explant by the scientists

b) Name this technology used for crop improvement.

2 In case of an infertile couple, the female partner produces normal ovum but is unable to provide suitable environment for further development of embryo.Which kind of ART is suited in this situation to form a foetus? 

3 Name the muscular and glandular layer of human uterus.

4 List two advantages that a mycorrhizal association provides to the plant.

5 Name the product of fertilisation that forms the kernel of coconut. How does the kernel differ from coconut water?

Section B

6 What is ‘The Evil Quartet’ that has caused biodiversity loss?

7 Why have certain regions been declared as biodiversity ‘hotspots by environmentalists of the world? Name any two hotspot regions of India.

8 What is the inheritance pattern observed in the size of starch grains and seed shape of Pisum Sativum? Work out the monohybrid cross showing the above traits. How does this pattern of inheritance deviate from that of Mendelian law of dominance?

 

9 a) Name the natural source of Agarose. Mention one role of agarose in biotechnology.
b) What was the specialty of the milk produced by the transgenic cow, Rosie?
 
10 Discovery of lobefins is considered very significant by evolutionary biologists. Explain 2
 
Section C
 
11 List any three outbreeding practices carried out to breed domestic animals. Explain the importance of each one listed.
 
OR
Trace the events in human body that occur to cause immunodeficiency, when HIV gains entry into the body.
 
12 (a) Baculoviruses are an excellent candidate for integrated pest management in an ecologically sensitive area. Explain giving two reasons.
(b) What is organic farming? Why is it suggested to switch over to organic farming?
 
13 (a) In a pond , there were 20 Hydrilla plants. Through reproduction, 15 new Hydrilla plants were added in a year. Calculate the birth rate of the population.
(b) List any four adaptations evolved in animals to adapt to their parasitic mode of life.
 
 
14 What is point mutation? Explain with the help of an example. 
 
15 i) What is accelerated eutrophication and how is it different from Eutrophication? Mention its consequence in the water body.
ii)A crane has DDT level as 5 ppm in its body. What would happen to the population of such birds? Give reasons.
 
 
16 (a) Correlate the codons on mRNA strand with the amino acids of a polypeptide translated
5’ – AUG ACC UUU CAC UUC GUG UAA – 3’……..mRNA
Met – Thr – Phe – His – Phe – Val ……..Translated polypeptide
Infer any four properties of genetic code with example from the above information
(b) In the genetic code for 64 amino acids, how many codons code for amino acids and how many do not?
 
17 Describe the hormonal control of spermatogenesis in a human male. 
 
18 a) Mention two strategies evolved in plants to prevent autogamy in flowers
b) Differentiate between the menstrual cycle and oestrous cycle.
 
19 a) Plasmid is a boon to biotechnology. Justify this statement quoting the production of human insulin as an example.
b) How is the insulin produced using biotechnology different from proinsulin secreted by functional human insulin gene, with the help of diagram?
 
 
20 a) Explain the process of charging of tRNA. Mention its role in transcription.
b) How do ribosomes in the cells act as factories for protein synthesis?
c) Describe initiation and termination phases of protein synthesis.


Please click the link below to download CBSE Class 12 Biology Sample Paper 2020 Solved Set A 


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CBSE Class 12 Biology Sample Paper 2020 Set 01 Solved & Sample Question Papers for Class 12 Biology

Access Sample Papers for Class 12 Biology

Explore downloadable sample sets for Class 12 Biology. Utilizing the CBSE Class 12 Biology Sample Paper 2020 Set 01 Solved allows learners to gauge exam readiness and master official CBSE assessment structures.

Maximize Your Scores with Model Papers

  • Curriculum Insights: Clarify chapter-wise weightage rules and question trends across Class 12.
  • Gap Analysis: Check performance drops across sets to isolate specific Class 12 Biology topics needing extra attention.
  • Time Efficiency: Working through objective and descriptive problems builds critical pacing to finish exams comfortably.

How to Analyze Your Performance in CBSE Class 12 Biology Sample Paper 2020 Set 01 Solved

  1. Verify Answers: Compare your responses against professional teacher solutions provided in the sample paper keys.
  2. Error Analysis: Class 12 learners must review incorrect answers carefully to understand underlying mistakes.
  3. Concept Reinforcement: Consult the official NCERT book for Class 12 Biology when stuck before re-attempting problems.

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Practicing this Biology paper helps in time management and identifying important topics. For Class 12, solving mock papers is the best way to gain confidence and reduce exam-day anxiety.

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