CBSE Class 12 Biology Sample Paper 2021 Set B Solved

Biology
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Read and download PDF of CBSE Class 12 Biology Sample Paper 2021 Set B Solved 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 2021 Set B Solved

Biology Class 12 Sample Paper

SECTION A
 
1 What stimulates the pituitary to release the hormone for parturition? Name the hormone.
 
2 Are wings of birds and insects homologous or analogous organs? What type of evolution does it show?
 
3 How is the presence of Anabaena in the paddy fields beneficial to crops? 
 
4 Name the special type of polymerase used in PCR and state its importance. 
 
5 The gene cry1Ab is introduced into a plant to control corn borer.
a) Name the resultant plant after successful insertion of the gene.
b) State its importance in the plant
 
SECTION B
 
6 What are Sertoli cells? State their role. 
 
7 Why is an antibody represented as H2L2? 
 
OR
 
Draw the structure of an antibody molecule. What type of immunity is brought about by antibodies?
 
8 What is the role of Ori and restriction site in Pbr322? 
 
9 What are ecological pyramids? What are the short comings of ecological pyramids in the study of ecosystem?
 
10 Alien species are a threat to the local species. Justify with 2 examples. 
 
SECTION C
 
11 a) Where does spermatogenesis occur in testes? Describe the process with a figure.
b) Trace the path of spermatozoan from testes upto the ejaculatory duct.
 
12 What is population explosion? Mention any two measures taken by the Government to control. 
 
13 A normal woman whose father is colour blind marries a normal visioned man. What would be the probability of her sons and daughters to be colour blind? Explain with a cross.
 
14 Write the full form of SNPs, BAC and YAC. 
 
OR
 
What is the dual function of AUG? Give the sequence of bases it is transcribed from and its anticodon.
 
15 a) State the arrangement of different genes that in bacteria is referred to as operon.
b) Give a schematic representation of lac operon in a switched- off state.
c) What is the role of lactose in the above operon?
 
16 a) Give the set up used by Urey and Miller for their experiment.
b) Write the names of the different gases and the conditions set up for the experiment.
c) What was the conclusion drawn from the experiment performed?
 
17 a) What is meant by addictive disorder?
b) Name any 2 coca alkaloids.
c) Mention any 2 ways by which they affect the body.
 
18 Mention A and B of the following flow chart. Why is the importance of the technique shown is increasing?
  Habit and nature of bees
         ↓
         A
         ↓
         B
         ↓
        Management of beehives
         ↓
        Handling and collection of honey
 
19 Why are genes with antibiotic resistance considered as useful selectable markers for E.coli cloning vector? Explain with an example.
 
20 a) Name the nematode that infects the tobacco plants.
b) How are transgenic plants of tobacco raised to solve the above problem?
 
21 Study the population growth curves given below.
CBSE Class 12 Biology Sample Paper 2021 Set B Solved 1
a) Identify curves a and b.
b) Mention the conditions responsible for curves a and b.
c ) What does K in curve b stand for? Explain.
 
22 What initiatives were taken for reducing vehicular air pollution in Delhi? Has the quality of air improved in Delhi?
 
SECTION D
 
23 A lake that is rich in marine fishes sees a decline in its species population due to over harvesting. The people in the area made it a sacred grove and started worshipping it. The species population of the lake also became normal.
a) Which values are being promoted in the above case?
b) What would have been the effect if the lake had not been declared as a sacred grove?
 
SECTION E
 
24 a) Draw a sketch of the section of a typical anatropous ovule.
b) List the components of the embryo sac and mention their fate on fertilization.
 
OR
 
a) Give a schematic representation of spermatogenesis in humans.
b) At which stage of life does gametogenesis begin in male and female respectively?
c) Name the organs where the above process gets completed.
 
25 A tall pea plant with yellow seeds heterozygous for both the traits is crossed with adwarf plant with green seeds. Work out the cross and show the F2 generation in the form of a checker board. Give the phenotypic ratio
 
OR
 
a) Why is DNA molecule a more stable genetic material than RNA?
b) Mention the salient features of a genetic code.
 
26 a) Cancer is one of the most dreaded human disease. Explain contact inhibiton and metastasis with reference to the disease.
b) Name the group of genes that could lead to cancer and how they do so?
c) Name any 2 techniques which are useful to detect cancers of internal organs.
d) What is the role of biological response modifiers with respect to the above?
 
OR
 
Complete the given table and add a note on their utility in human.

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2025
CBSE Class 12 Biology 2025 Sample Paper Solved
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CBSE Class 12 Biology Sample Paper 2023 Solved
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2021
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2017
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2015
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2014
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2013
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2012
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2011
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2010
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2009
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CBSE Class 12 Biology Sample Paper 2021 Set B Solved

We hope you liked the above provided CBSE Class 12 Biology Sample Paper 2021 Set B Solved. To get an understanding of the type of questions which were asked in exams, it is important for Class 12 students to understand the way sample Paper are set by teachers. 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. By doing CBSE Class 12 Biology Sample Paper 2021 Set B Solved you will understand the regular questions and MCQ questions for Class 12 Biology which are always asked. You can download CBSE Class 12 Biology Sample Paper and Class 12 Biology Question 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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