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General Instructions :
(i) There are a total of 26 questions and five sections in the question paper, All questions are compulsory.
(ii) Section A contains question number 1 to 5, Very Short Answer type questions of one mark each.
(iii) Section B contains question number 6 to 10, Short Answer type I questions of two marks each.
(iv) Section C contains question number 11 to 22, Short Answer type II questions of three marks each.
(v) Section D contains question number 23, Value Based Question of four marks.
(vi) Section E contains question number 24 to 26, Long Answer type questions of five marks each.
(vii) 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.
Question 1
  • Q1

    According to de-Vries what is saltation? 

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  • Q2

    Excessive nutrients in a fresh water body cause fish mortality. Give two reasons. 

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  • Q3

    Suggest the breeding method most suitable for animals that are below average in milk productivity. 

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  • Q4

    State a difference between a gene and an allele. 

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  • Q5

    Suggest a technique to a researcher who needs to separate fragments of DNA. 

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  • Q6

    Explain the significance of meiocytes in a diploid organism. 

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  • Q7

    Mention the kind of biodiversity of more than a thousand varieties of mangoes in India represent. How is it possible? 

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  • Q8

    List the events that reduce the Biological Oxygen Demand (BOD) of a primary effluent during sewage treatment. 

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  • Q9

    Discuss the role the enzyme DNA ligase plays during DNA replication. 

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  • Q10

    Name the causative organism of the disease amoebiasis. List three symptoms of the disease.
     

    OR

    Identify 'A', 'B', 'C' and 'D' in the given table.
     
    Crop Variety Resistance to disease
       A    Himgiri Leaf rust
    Cauliflower Pusa Shubhra    B   
    Brassica Pusa Swarnim    C   
    Cowpea    D    Bacterial blight
     

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  • Q11

    Why is breast-feeding recommended during the initial period of an infant's growth? Give reasons. 

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  • Q12

    Give an example of an autosomal recessive trait in humans. Explain its pattern of inheritance with the help of a cross. 

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  • Q13

    Describe the experiment that helped Louis Pasteur to dismiss the theory of spontaneous generation of life. 

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  • Q14

    Plant breeding technique has helped sugar industry in North India. Explain how. 

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  • Q15

    Suggest and describe a technique to obtain multiple copies of a gene of interest in vitro. 

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  • Q16

    What is a GMO? List any five possible advantages of a GMO to a farmer. 

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  • Q17

    During a school trip to 'Rohtang Pass', one of your classmate suddenly developed 'altitude sickness'. But, she recovered after sometime.
    (a) Mention one symptom to diagnose the sickness.
    (b) What caused the sickness?
    (c) How could she recover by herself after sometime? 

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  • Q18

    How has RNAi technique helped to prevent the infestation of roots in tobacco plants by a nematode Meloidegyne incognitia? 

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  • Q19

    "In a food-chain, a trophic level represents a functional level, not a species." Explain.
     

    OR

    (a) Name any two places where it is essential to install electrostatic precipitators. Why it is required to do so?
    (b) Mention one limitation of the electrostatic precipitator. 

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  • Q20

    Prior to a sports event blood & urine samples of sports-persons are collected for drug tests.
    (a) Why is there a need to conduct such tests?
    (b) Name the drugs the authorities usually look for.
    (c) Write the generic names of two plants from which these drugs are obtained. 

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  • Q22

    Given below is a list of six micro-organisms. State their usefulness to humans.
    (a) Nucleopolyhedrovirus
    (b) Saccharomyces cerevisiae
    (c) Monascus purpureus
    (d) Trichoderma polysporum
    (e) Penicillium notatum
    (f) Propionibacterium sharmanii 

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  • Q21

    Describe the experiment that helped demonstrate the semi-conservative mode of DNA replication. 

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  • Q24

    (a) Explain the post-pollination events leading to seed production in angiosperms.
    (b) List the different types of pollination depending upon the source of pollen gain.
                                                           

                                                              Or
     
    (a) Briefly explain the events of fertilisation and implantation in an adult human female.
    (b) Comment on the role of placenta as an endocrine gland.
     

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  • Q25

    (a) How are the following formed and involved in DNA packaging in a nucleus of a cell?

    (i) Histone octomer
    (ii) Nucleosome
    (iii) Chromatin

    (b) Differentiate between Euchromatin and Heterochromatin. 

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  • Q26

    (a) Why should we conserve biodiversity ? How can we do it?
    (b) Explain the importance of biodiversity hot-spots and sacred groves.

                                                           Or

    (a) Represent diagrammatically three kinds of age-pyramids for human populations.
    (b) How does an age pyramid for human population at given point of time helps the policy-makers in planning for future. 

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  • Q23

    Reproductive and Child Healthcare (RCH) programmes are currently in operation. One of the major tasks of these programmes is to create awareness amongst people about the wide range of reproduction related aspects. As this is important and essential for building a reproductively healthy society.

    (a) "Providing sex education in schools in one of the ways to meet this goal." Give four points in support of your opinion regarding this statement.

    (b) List any two 'indicators' that indicate a reproductively healthy society.

     

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