CBSE Class 12 Biology Sample Paper 2021 Set D

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

Biology Class 12 Sample Paper

Section – A
 
1. A tissue, of a tobacco plant, infected with TMV was used to obtain a new plant. Identify the technique used and reason out the possibility of obtaining a new healthy plant.
 
2. State a method of cellular defense which works in all eukaryotic organisms 1
 
3. In case of an infertile couple, the male partner can inseminate normally but the mobility of sperms is below 40 percent. Which kind of ART is suitable in this situation to form an embryo in the laboratory conditions, without involving a donor?
 
4. Write the two components of the first artificial recombinant DNA molecule constructed by Cohen and Boyer.
 
5. A cross was carried out between two pea plants showing the contrasting traits of height of the plant. The result of the cross showed 50% of parental characters.n Name the type of cross.
 
Section B
 
6. The alarming population growth is leading to scarcity of basic requirements. Suggest with reasons, any two population control measures other than contraception to address the situation.
 
7. During a cytological study conducted on the chromosomes of the insects, it was observed that only 50% of the sperms had a specific structure after spermatogenesis. Name the structure and write its significance in sex determination of insects.
 
8. To reduce the percentage of population suffering from hunger and malnutrition, microbes are grown on a large scale to act as food supplements. Mention any two microbes used as food supplement and suggest their role.
 
OR
 
Success rate of artificial insemination in cattle is fairly low. Identify any other technique to improve the successful production of hybrids. State two advantages of this technique.
 
9. (a) A patient who had an organ transplant was given cyclosporin– A. Mention the microbial source and state the reason for administration of this bioactive molecule.
(b) Bottled fruit juices bought from the market are clearer as compared to those made at home. Give reason.
 
10. Evaluate the effect of loss of biodiversity in a region. Mention any four such effects.
 
Section C
 
11. Draw the diagram of microsporangium of an Angiosperm and label any four parts State the function of its innermost wall layer.
 
12. Give reason : -
(a) A liverwort plant is unable to complete its life cycle in a dry environment.
(b) Number of male gametes produced is much more than the female gametes produced.
(c) Organisms exhibiting external fertilization show great synchrony between the sexes and release a large number of gametes into surrounding medium.
 
13. (a) Name the different gases contained in the flask used as an experimental setup by S.L. Miller.
(b) On the basis of composition of gases in this experiment, what was the condition in the flask?
(c) Write the conclusion drawn from this experiment.
 
14. When a snapdragon plant bearing pink colour flower was selfed, it was found that, 69 plants were having red coloured flowers. What would be the number of plants bearing pink flower and white flower. Show with the help of Punnett square. Identity the principle of inheritance involved in this experiment
 
15. Refer to the figure given below and answer the questions that follow:

CBSE Class 12 Biology Sample Paper 2021 Set D 1

(a) Explain the process by which Tasmanian wolf evolved.
(b) Name the process that has resulted in evolution of wolf and Tasmanian wolf.
(c) Compare and contrast the two animals shown?
 
16. Your classmate complains of headache and cough. On the basis of certain symptoms, the doctor confirms that he is suffering from Pneumonia and not common cold. List these symptoms. Mention any two precautions to be followed to prevent the spread of this disease.
 
17. Cow dung and water is mixed and this slurry is fed into the biogas plant for digestion by microbes. The person performing the process shares that there is no need to provide any inoculum for it. Give reason. What is the role of microbes at the source? Under which condition will they be most active and effective?
 
18. A person is born with a weakened immune system due to deficiency of an enzyme which is a hereditary disease. Suggest a technique to completely cure this disease, identify the deficient enzyme and explain the technique used, for cure.
 
19. A doctor prescribed morphine as a sedative and pain killer to your cousin who had undergone a surgery. Even after recovery, he indiscriminately took the medicines and later craved for the same. What do you conclude about his
condition? What measures will you suggest to him to overcome this problem? Briefly explain any two.
 
20. Given below is the diagram of agarose gel kept under UV light:
CBSE Class 12 Biology Sample Paper 2021 Set D 2
(a) Mention the positive and negative terminals.
(b) What is the charge carried by DNA molecule and how does it help in its separation?
(c) How are the separated DNA fragments finally isolated?
 
OR
 
CryIAbis introduced in a plant to prevent infestation by corn borer.
(a) What is the resultant plant referred as?
(b) Summarize the action of the gene introduced
 
 
21. (a) In pBR322, foreign DNA has to be introduced in tetRregion. From the restriction enzymes given below, which one should be used and why: PvuI, EcoRI, BamHI
(b) Give reasons, why the other two enzymes cannot be used.
 


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2024
CBSE Class 12 Biology Sample Paper 2024 Solved
2023
CBSE Class 12 Biology Sample Paper 2023 Solved
2022
CBSE Class 12 Biology Sample Paper 2022 Set A Solved
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CBSE Class 12 Biology Sample Paper 2022 Set C Solved
CBSE Class 12 Biology Sample Paper 2022 Set D Solved
2021
CBSE Class 12 Biology Boards 2021 Sample Paper Solved
CBSE Class 12 Biology Sample Paper 2021 Set A Solved
CBSE Class 12 Biology Sample Paper 2021 Set B Solved
CBSE Class 12 Biology Sample Paper 2021 Set C Solved
CBSE Class 12 Biology Sample Paper 2021 Set D
2020
CBSE Class 12 Biology Boards 2020 Sample Paper Solved
CBSE Class 12 Biology Sample Paper 2020 Solved Set A
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2019
CBSE Class 12 Biology Sample Paper 2019 Solved
CBSE Class 12 Biology Sample Paper 2019 Solved Set A
2018
CBSE Class 12 Biology Sample Paper 2018 Set A
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CBSE Class 12 Biology Sample Paper 2018 Set D
CBSE Class 12 Biology Sample Paper 2018 Set E
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2017
CBSE Class 12 Biology Sample Paper 2017 Set A
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CBSE Class 12 Biology Sample Paper 2017 Set E
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CBSE Class 12 Biology Sample Paper 2017 Set H
2015
CBSE Class 12 Biology Sample Papers 2015 Set A
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CBSE Class 12 Biology Sample Papers 2015 Set D
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CBSE Class 12 Biology Sample Papers 2015 Solved Set C
2014
CBSE Class 12 Biology Sample Paper 2014 Set A
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CBSE Class 12 Biology Sample Paper 2014 Set C
CBSE Class 12 Biology Sample Paper 2014 Set E
CBSE Class 12 Biology Sample Paper 2014 Set F
CBSE Class 12 Biology Sample Paper 2014 Set G
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CBSE Class 12 Biology Sample Paper 2014 Solved Set D
2013
CBSE Class 12 Biology Sample Paper 2013 Set D
CBSE Class 12 Biology Sample Paper 2013 Set E
CBSE Class 12 Biology Sample Paper 2013 Set F
CBSE Class 12 Biology Sample Paper 2013 Set G
CBSE Class 12 Biology Sample Paper 2013 Set I
CBSE Class 12 Biology Sample Paper 2013 Solved Set A
CBSE Class 12 Biology Sample Paper 2013 Solved Set B
CBSE Class 12 Biology Sample Paper 2013 Solved Set C
CBSE Class 12 Biology Sample Paper 2013 Solved Set H
2012
CBSE Class 12 Biology Sample Paper 2012 Set A
CBSE Class 12 Biology Sample Paper 2012 Set B
CBSE Class 12 Biology Sample Paper 2012 Set D
CBSE Class 12 Biology Sample Paper 2012 Solved Set C
CBSE Class 12 Biology Sample Paper 2012 Solved Set E
2011
CBSE Class 12 Biology Sample Papers 2011 Set A
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CBSE Class 12 Biology Sample Papers 2011 Set C
CBSE Class 12 Biology Sample Papers 2011 Set D
2010
CBSE Class 12 Biology Sample Paper 2010 Set A
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CBSE Class 12 Biology Sample Paper 2010 Solved Set C
CBSE Class 12 Biology Sample Paper 2010 Solved Set D
2009
CBSE Class 12 Biology Sample Paper 2009 Set A
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CBSE Class 12 Biology Sample Paper 2009 Set C
CBSE Class 12 Biology Sample Paper 2009 Set D
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Sample Paper Biology Class 12

We hope you liked the above provided CBSE Class 12 Biology Sample Paper 2021 Set D. 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 2021 Set D 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 2021 Set D 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 2021 Set D 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 2021 Set D 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 2021 Set D 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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