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CBSE Class 12 Biology Practice Paper 2017: Set – IV

Feb 21, 2017 16:45 IST

    CBSE Class 12 Biology Practice Paper for Class 12th board exam 2017 is available here. This pattern of this practice paper is almost similar to the latest Class 12 Biology Sample Paper released by CBSE.

    CBSE Date Sheet 2017: Exam Dates changed for Class 12 and Class 10

    Analysis of previous year CBSE Class 12 Biology Question Papers shows that some important concepts are frequently asked in board exam, every year. All the question of this practice paper are based on these concepts.

    The complete practice paper is given below:

    Time allowed: 3 hours                                                                                       Maximum Marks: 70

    General Instructions:

    (i) There are total 26 questions and five sections in the question paper. All questions are compulsory.

    (ii) Sec A contains questions number 1 to 5; very short answer type questions of 1 mark each.

    (iii) Sec B contains questions number 6 to 10, short-answer type I questions of 2 marks each.

    (iv). Sec C contains questions number 11 to 22, short answer type II questions of 3 marks each.

    (v). Sec D contains question number 23, value based question of 4 marks.

    (vi). Sec E contains questions number 24 to 26, long-answer type questions of 5 marks each.

    (vii). There is no overall choice in the question paper; however, an internal choice is provided in one question of 2 marks, one question of 3 marks and all the three questions of 5 marks. In these questions, an examinee is to attempt any of the two given alternatives.

    Question 1. What is the principle involved in natural methods of birth control.

    Question 2. Mention the role of 'genetic mother' in MOET.

    Question 3. If 60 children were born in a hospital out of which 6 children died in a week, then what would be the death rate of children in that hospital?

    Question 4. Name the technique used to separate DNA fragments in a laboratory?

    Question 5. Mention two advantages for preferring CNG over diesel as an automobile fuel.

    CBSE Class 12 Biology Syllabus 2017

    Question 6. Retroviruses have no DNA. However, the DNA of the infected host cell does possess viral DNA. How is it possible?

    Question 7. A cross between a red flower bearing plant and a white flower bearing plant of

    Arntirrhinum produced all plants having pink flowers. Work out a cross to explain how this is possible.

    Question 8. What is corpus luteum? How does it function as an endocrine gland?

    Question 9. A moss plant is unable to complete its life-cycle in a dry environment. State two reasons.

    OR

    Question 9. Why are green algae not likely to be found in the deepest strata of the ocean?

    Question 10. Name a genus of baculovirus. Why are they considered good biocontrol agents?

    CBSE Class 12 Mathematics 2017 Sample Paper

    Question 11. A man while walking on road side was hit by a car accident. He was heavily bleeding and bruised. He was immediately taken to a nursing home. The doctor immediately gave him an injection to protect him against a deadly disease. 
    (a) Name the drug that doctor injected into the patient’s body.
    (b) Name the disease against which this injection was given.

    (c) How do you think this injection would protect the patient against the disease?

    OR

    Question 11. Write the event that takes place when a vaccine for any disease is introduced in the body?

    Question 12. (a) Select the analogous structures from the combinations given below:
    (i) Forelimb of whales and bats
    (ii) Eyes of octopus and mammals
    (iii) Tuber of sweet potato and potato
    (iv) Thorns of bouganvillea and tendrils of Cucurbita
    (b) State the kind of evolution they represent.

    Question 13. Explain brood parasitism with the help of an example.

    Question14. Explain the enzyme replacement therapy to treat adenosine deaminase deficiency. Mention two disadvantages of this procedure.

    Question 15. Agrobacterium tumefaciens is pathogen of several dicot plants but still it is helpful in genetic engineering. Explain.

    CBSE Class 12 Physics 2017 Sample Paper

    Question 16. What is contact inhibition? How does this phenomenon operate in cancer cells?

    Question 17. Give two reasons explaining why there is more species diversification in tropical latitudes than in temperate ones.

    Question 18. Define apomixis. Write its significance. How can it be commercially used?

    Question 19. Microbes play a dual role when used for sewage treatment as they not only help to retrieve usable water but also generates fuel. Explain.

    Question 20. Distinguish between 

    (a) Ectotherms and Endotherms

    (b) Hibernation and Aestivation

    Question 21. Write the various steps involved in the formation of an ovum from an oogonium in human female?

    Question 22. The given flow chart is showing the ovarian changes during menstrual cycle. Name the hormone involved at each stage and explain their roles.

                Primary Follicle →  Graafian follicle → Ova →  Corpus Luteum

    Question 23. A group of scientists are working on creating transgenic cows to produce milk with medicinal properties. But there are adverse side-effects on the cows due to this procedure. Their life span shortens; they become prone to diseases and die very early.

    Answer the following questions based on the above information:

    (i) What values are being neglected by the scientists in the above situation?

    (ii) Should they continue with their production of transgenic cows? Give reason.

    (iii) What has been the reaction of different communities and various organizations to such acts?

    Question 24. List the salient features of double helix structure of DNA.

    OR

    Question 24. How do m-RNA, t-RNA and ribosomes help in the process of translation?

    Question 25. (a) Why is Fertilisation in an angiosperm referred to as double fertilisation? Mention  the ploidy of the cells involved.
    (b) Draw a neat labelled sketch of L.S. of an endospermous monocot seed.

    OR

    Question 25. (a) Draw a diagram of an enlarged view of T.S. of one microsporangium of an angiosperm and label the following parts :

                (i) Tapetum

                (ii) Middle layer

                (iii) Endothecium

                (iv) Microspore mother cells

    (b) Mention the characteristic features and function of tapetum.
    (c) Explain the following giving reasons:
                (i) Pollen grains are well preserved as fossils.

                (ii) Pollen tablets are in use by people these days. 

    Question 26. Given below is the table showing the genotypes and phenotypes of blood groups in the human population:

    Genotype

    Phenotype

    W

    A

    IBIO

    Y

    IAIB

    Z

    X

    O

     

    (i) Identify the genotype W and X and the phenotype Y and Z.

    (ii) How is co-dominance different from incomplete dominance?

    (iii) Name the pattern of inheritance exhibited by the phenotypes Y and Z in the table.

    OR

    Question 26. A man with AB blood group marries a woman with O blood group.

    (a) Work out all the possible phenotypes and genotypes of the progeny.

    (b) Discuss the kind of domination in the parents and the progeny in this case.

    Get the solution of this Practice Paper from this link

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