Sample paper for class 12 Biology

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Biology Sample papers

Here is CBSE class 12 Sample paper for Biology. To get the answers and more sample papers, visit myCBSEguide App or website stated above.

Sample Paper for class 12 Biology
Session 2017-2018

Time allowed: 3hrs. Maximum Marks: 70
General Instructions:

  • There are a total of 26 questions and five sections in the question paper. All questions are compulsory.
  • Section A contains question number 1 to 5, Very Short Answer type questions of one mark each.
  • Section B contains question number 6 to 10, Short Answer type I questions of two marks each.
  • Section C contains question number 11 to 22, Short Answer type II questions of three marks each.
  • Section D contains question number 23, Value Based Question of four marks.
  • Section E contains question number 24 to 26, Long Answer type questions of five marks each.
  • There is no overall choice in the question paper, however, an internal choice is provided in one question of two marks, one question of three marks and all three questions of five marks. An examinee is to attempt any one of the questions out of the two given in the question paper with the same question number.

Section – A

1. A certain tissue, of a plant, infected with TMV was used to obtain a new plant using tissue culture technique. Identify the technique used and reason out the possibility of obtaining a new healthy plant. (1)

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. Judge, which kind of ART is suitable in this situation to form an embryo in the laboratory, without involving a donor? (1)

4. Write the two components of the first artificial recombinant DNA molecule constructed by Cohen and Boyer. (1)

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. Name the type of cross.(1)

Section B

6. The alarming population growth is leading to scarcity of basic requirements. Suggest with reason, any two population control measures other than contraception to address the situation. (2)

7. During cytological study conducted on the chromosomes of the insects, it was observed that only 50% of the sperms had a specific typed of structure. Name the structure and write its significance in sex determination of insects. (2)

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. (2)


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. (2)

9. (a) A patient who had an organ transplant was given cyclosporine – A treatment. Mention the microbial source and state the reason for administration of this enactive molecules
(b) Bottled fruit juices bought from the market are clearer as compared to those made at home. Give reason. (2)

10. Assess the effects of loss of biodiversity in a region. Mention any four such effects. (2)

Section C

11. Draw and label the enlarged view of microsporangium of an Angiosperm. State the function of its innermost wall layer. (3)

12. Give reason :
(a) A liverwort plant is unable to complete its life cycle in a dry environment.
(b) Member of male genets produced is much more than the female genets produced.
(c) Organisms exhibiting external fertilization show great synchrony between the sexes and release a large number of gametes into surrounding medium. (3)

13. (a) Write the names of different gases contained in the flask of experimental setup used by S.L. Miller for his experiment.
(b) On the basis of composition of gases in this experiment, what was the condition in the flask?
(c) Write the conclusion drown from this experiment. (3)

14. When pink colour flower bearing snapdragon plant was selfed, it was found that 69 plants were having red coloured flowers. What would be the number of pin flower bearing plants and white flower bearing plants. Show with the help of Punnett square. Identity the principle of inheritance involved in this experiment (3)

15. Refer to the figure given below and answer the questions that follow:

Sample paper for class 12 Biology

(a) Explain the process by which Tasmanian wolf evolved.

(b) Name the process that has resulted in evolution of wolf and another similar animal such as Tasmanian wolf.

(c) Compare and contrast the two animals shown? (3)

16. Your classmate complains of headache and cough. The doctor confirms that he is suffering from Pneumonia and not common cold, on the basis of certain symptoms. List these symptoms. Mention any two precautions to be followed to prevent the spread of this disease. (3)

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 inoculum for it, why? What is the role of microbes at the source? Under which condition will they be most active and effective? (3)

18. A person is born with a hereditary disease with a weakened immune system due to deficiency of an enzyme. Suggest a technique for complete cure for this disease, identify the deficient enzyme and explain the technique used for cure. (3)

19. A doctor prescribed morphine as a sedative and pain killer to your cousin who had undergone surgery. Even after recovery, he craved for the prescribed medicine. What do you conclude about his condition, had he continued with the same medication? After appraising yourself, what measures will you suggest to him to overcome this problem? Briefly explain any two. (3)

20. Given below is the diagram of agarose gel kept under UV light:

(a) Mark 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? (3)


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 (3)

21. (a) In pBR322, foreign DNA has to be introduced in tetR region. 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. (3)

22. The graph given below shows the distribution of biomes: (3)

(a)What do the ‘X’ and ‘Y’ axes represent?
(b) Identify the ‘grassland’ and ‘coniferous forest’ biomes, from the above figure.
(c) Why is ‘F’ located at the given position in the graph?

Section D

23. A son persuades his father to replace his old mobile phone with the latest model launched in the market. He also shares the latest features it has and explains how it can be of a help to him in the modern technological world. Father is reluctant in buying a new one and tries to explain about its environmental impact. How do you think, the biologist father has tried to convince his son? Justify the arguments of father and son both, by mentioning positive aspects of the behavior displayed by both of them in the situation concerned (three each). (4)

Section E

24. Given below is the diagram of a human ovum surrounded by a few sperms.
Observe the diagram and answer the following questions: (5)

(a) Compare the fate of sperms shown in the diagram.

(b) What is the role of zona pellucid in this process?

(c) Analyze the changes occurring in the ovum during the process.

(d) How is the entry of sperm into the ovum facilitated?

(e) Specify the region of female reproductive system where the event represented in the diagram takes place.


The graph given below shows the variation in the levels of ovarian hormones during various phases of menstrual cycle:

(a) Identify ‘A’ and ‘B’.

(b) Specify the source of the hormone marked in the diagram.

(c) Reason out why A peaks before B.

(d) Compare the role of A and B.

(e) Under which condition will the level of B continue to remain high on the 28thday?

25. Explain the process of protein synthesis from processed m-RNA. (5)


Which methodology is used while sequencing the total DNA from a cell? Explain it in detail.

26. Citing lake as an example of a simple aquatic ecosystem, interpret how various functions of this ecosystem are carried out. Make a food chain that is functional in this ecosystem. (5)


a) Colonization of a rocky terrain is a natural process. Mention the group of organisms which invade this area first. Give an example.
b) Over the years, it has been observed that some of the lakes are disappearing due to urbanization. In absence of human interference, depict by making a flow chart, how do the successional seres progress from hydric to mesic condition.
c) Identify the climax community of hydrarch and xerarch succession.

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Sample Paper for class 12

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Marking Scheme for Class 12 Board exam

SubjectBoard MarksPractical or internal Marks
English100 MarksZERO Marks
Hindi100 MarksZERO Marks
Mathematics100 MarksZERO Marks
Chemistry70 Marks30 Marks
Physics70 Marks30 Marks
Biology70 Marks30 Marks
Computer Science70 Marks30 Marks
Informatics Practices70 Marks30 Marks
Accountancy80 Marks20 Marks
Business Studies80 Marks30 Marks
Economics80 Marks20 Marks
History80 Marks20 Marks
Political Science100 MarksZERO Marks
Geography70 Marks30 Marks
Sociology80 Marks20 Marks
Physical Education70 Marks30 Marks
Home Science70 Marks30 Marks

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