CBSE Class 12 Biology Question Paper 2021 Set A Solved

Read and download CBSE Class 12 Biology Question Paper 2021 Set A Solved designed as per the latest question paper pattern and Class 12 examination guidelines issued by CBSE, NCERT and KVS. The past year Question Papers for Class 12 Biology have been provided with solutions which will help students to assess their performance and find out topics in Biology Class 12 which they need to improve to get better marks in Class 12 exams. After solving these last year papers also refer to solved Sample Papers for Class 12 Biology available on our website to build strong understanding of the subject

Biology Question Paper Class 12

Students can refer to the below Class 12 Biology Question Paper designed to help students understand the pattern of questions that will be asked in Class 12 exams. Please download CBSE Class 12 Biology Question Paper 2021 Set A Solved

Biology Class 12 Question Paper

SECTION A

1 A male honeybee has 16 chromosomes whereas its female has 32 chromosomes. Give one reason. 
 
2 How can an alien piece of DNA made to multiply in a host cell? 
 
3 If adenine constitutes 30% of an isolated DNA fragment, then what is the expected % of the base cytosine in it?
 
4 Name the vector of Chikungunya disease. 
 
5 Jhum cultivation has been in practice from earlier days, but it’s considered more problematic these days. Why?
 
OR
 
How is competition avoided in Nature? Give example.
 
SECTION B
 
6 Differentiate between inbreeding and out breeding in animals. 
 
7 What is meant by germplasm Collection? Describe its significance in plant breeding programmes.
 
OR
 
Name two alcoholic drinks produced in each of the following ways. (i) With distillation and (ii) without distillation.
 
8 Categories the following pairs of examples as convergent or divergent evolutions:
(a) Eyes of octopus and mammals. (b) Wings of butterfly and birds. (c) Tuber of sweet potatoes and potato. (d) Thorns in bougainvillea and tendrils in cucurbits.
 
9 How does geitonogamy differ from xenogamy in plants? 
 
10 Mention two applications of biotechnology in medicine with examples. 
 
11 Monocistronic structural genes in eukaryotes have interrupted coding sequences, Explain. How are they different in prokaryotes?
 
12 Name two types of animals based on their temperature tolerance. 
 
SECTION C
 
13 a) Taking one example each of habitat loss and fragmentation, explain how the two are responsible for biodiversity loss. b) Explain two different ways of biodiversity conservation.
 
14 How is Agrobacterium tumifaciens used in rDNA technology? Explain what and how are other pathogens are used for the purpose ?State two other methods by which host organism can be transformed?
 
15 How did Darwin theory of natural selection explain the appearance of new forms on the earth? 3
 
16 How do mycorrhizae function as biofertilisers? Explain with example. Name one cyanobacteria that can be used as a biofertiliser.
 
17 Explain the role of S and P in the experiments conducted by Hershey and chase?
 
OR
 
Explain the mechanism of sex determination in honeybees.
 
18 Explain different phases of spermatogenesis with schematic representation.
 
OR
 
Mention any three differences between spermatogenesis and oogenesis.
 
19 Describe the three different practices under natural methods of birth control. 
 
20 After a rainy day Shruti found many dragonflies flying over stagnant water. She thinks these flies come to drink water. i) Is Shruti’s explanation correct? Give your views
ii) Write the significance of your view in organic farming.
 
OR
 
What is biochemical oxygen demand (BOD) test? At what stage of Sewage treatment this test is performed? BOD level of three samples of water labeled as A, B and C are 30 mg/ L, 10mg/L and 500 mg/L respectively. Which sample of water is most polluted?
 
21 How is Biotechnology used to produce Bt cotton? Explain.
 
22 You have observed that fruit juice in bottles bought from the market is clearer as compared to those made at home. Give reason. Suggest a similar application in the field of detergent industry.
 
23 What are the producers in grass land and oceans .How is GPP different from NPP? Why is the productivity in oceans lesser than on land?
 
24 What will be the genotype and phenotype of the offspring if a colour blind man marries a carrier woman? Show the cross.
 
OR
 
How do histones acquire positive charge?
 
SECTION D

25 With a flow chart explain the process of decomposition .What factors affect this process?
 
OR
 
In Arcata, the town’s people have created an integrated waste water treatment process within a natural system. A citizen group called FOAM helps in upkeep of this project. (a) What are the main steps in waste water management done in this way? (b) .Ecosan. in Kerala and Sri Lanka is also an initiative for water conservation. How?
 
26 Explain the various phases of menstrual cycle with reference to changes in ovary and uterus and hormonal cycle.
 
OR
 
Continued self-pollination result in inbreeding depression. What are the out breeding devices developed in flowering plants to discourage self-pollination? Which type of pollination seen in Papaya?
 
27 What is a point mutation? Illustrate using the example of Sickle cell anaemia. Give the genotypes of a career and a sickle celled person.
 
OR
 
Explain the role of RNA polymerase in transcription in bacteria.


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Previous Year Question Paper Biology Class 12

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Class 12 Biology Previous Year Question Papers

The past year question papers CBSE Class 12 Biology Question Paper 2021 Set A Solved covers all the topics which have been suggested by CBSE in their Class 12 Biology syllabus for the current year. By doing all CBSE Class 12 Biology Question Paper 2021 Set A Solved 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.

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Biology Previous Year Question Papers Class 12 with Solutions

We have provided CBSE Class 12 Biology Question Paper 2021 Set A Solved with solutions. You will be able to understand the type of answers which you should write in Class 12 Biology exams to score good marks. 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. This way you will be able to identify your weak areas and also understand how the teachers of Class 12 Biology set their questions in the exams.

CBSE Class 12 Biology Previous Year Question Papers with solutions

We have provided the last 10 years Class 12 Biology Question Papers. Students who want to practice question papers from all previous years can easily get them on studiestoday. We are the leading website in India from which you can download all the latest Class 12 Biology study material for free as per the CBSE syllabus for Class 12 Biology for the current academic year.
 

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