CBSE Class 12 Biology Sample Paper 2020 Solved Set A

Read and download PDF of CBSE Class 12 Biology Sample Paper 2020 Solved Set A designed as per the latest curriculum and examination pattern for Class 12 issued by CBSE, NCERT and KVS. The latest Class 12 Biology Sample Papers have been provided with solutions so that the students can solve these practice papers and then compare their answers. This will help them to identify mistakes and improvement areas in Biology Class 12 which they need to study more to get better marks in Class 12 exams. After solving these guess papers also refer to solved Class 12 Biology Question Papers available on our website to build strong understanding of the subject

Sample Paper for Class 12 Biology Pdf

Students can refer to the below Class 12 Biology Sample Paper designed to help students understand the pattern of questions that will be asked in Class 12 exams. Please download CBSE Class 12 Biology Sample Paper 2020 Solved Set A

Biology Class 12 Sample Paper

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.


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Sample Paper Biology Class 12

We hope you liked the above provided CBSE Class 12 Biology Sample Paper 2020 Solved Set A. To get an understanding of the type of questions which were asked in exams, it is important for Class 12 students to refer to CBSE Class 12 Biology Sample Paper 2020 Solved Set A that we have provided above. Students can download the Sample Paper for Class 12 Biology which will be coming in the exams so that you can practise them and solve all types of questions that can be asked in exams. If you do CBSE Class 12 Biology Sample Paper 2020 Solved Set A for Class 12 Biology you will easily understand the way examination Sample Paper are set by teachers.

Class 12 Biology Sample Paper

The latest Sample Paper CBSE Class 12 Biology Sample Paper 2020 Solved Set A covers all the topics which have been suggested by CBSE in their Class 12 Biology syllabus for the current year. By doing CBSE Class 12 Biology Sample Paper 2020 Solved Set A 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 Sample Paper Class 12 with Solutions

We have provided CBSE Class 12 Biology Sample Paper 2020 Solved Set A 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 Sample Paper with solutions

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