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Board Paper of Class 12-Science 2016 Biology Delhi(SET 2) - Solutions

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
    Suggest a technique to a researcher who needs to separate fragments of DNA. VIEW SOLUTION
  • Question 2
    State a difference between a gene and an allele. VIEW SOLUTION
  • Question 3
    Give an example of a human disorder that is caused due to a single gene mutation. VIEW SOLUTION
  • Question 4
    Suggest the breeding method most suitable for animals that are below average in milk productivity. VIEW SOLUTION
  • Question 5
    Excessive nutrients in a fresh water body cause fish mortality. Give two reasons. VIEW SOLUTION
  • Question 6
    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
    VIEW SOLUTION
  • Question 7
    Discuss the role the enzyme DNA ligase plays during DNA replication. VIEW SOLUTION
  • Question 8
    Explain the importance of syngamy and meiosis in a sexual life cycle of an organism. VIEW SOLUTION
  • Question 9
    List the events that lead to biogas production from waste water whose BOD has been reduced significantly. VIEW SOLUTION
  • Question 10
    Why the plants that inhabit a desert are not found in a mangrove? Give reasons. VIEW SOLUTION
  • Question 11
    Describe the experiment that helped Louis Pasteur to dismiss the theory of spontaneous generation of life. VIEW SOLUTION
  • Question 12
    Differentiate between somaclones and somatic hybrids. Give one example of each. VIEW SOLUTION
  • Question 13
    Why is breast-feeding recommended during the initial period of an infant's growth? Give reasons. VIEW SOLUTION
  • Question 14
    Suggest and describe a technique to obtain multiple copies of a gene of interest in vitro. VIEW SOLUTION
  • Question 15
    What is a GMO? List any five possible advantages of a GMO to a farmer. VIEW SOLUTION
  • Question 16
    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 VIEW SOLUTION
  • Question 17
    A couple with normal vision bear a colour blind child. Work out a cross to show how it is possible and mention the sex of the affected child. VIEW SOLUTION
  • Question 18
    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. VIEW SOLUTION
  • Question 19
    In certain seasons we sweat profusely while in some other season we shiver. Explain. VIEW SOLUTION
  • Question 20
    "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. VIEW SOLUTION
  • Question 21
    How has RNAi technique helped to prevent the infestation of roots in tobacco plants by a nematode Meloidegyne incognitia? VIEW SOLUTION
  • Question 22
    Give an example of an autosomal recessive trait in humans. Explain its pattern of inheritance with the help of a cross. VIEW SOLUTION
  • Question 23

    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.

    VIEW SOLUTION
  • Question 24
    (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. VIEW SOLUTION
  • Question 25
    (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.
    VIEW SOLUTION
  • Question 26
    List the criteria a molecule that can act as genetic material must fulfill. Which one of the criteria are best fulfilled by DNA or by RNA thus making one of them a better genetic material than the other? Explain.
     
    OR

    (a) Differentiate between analogy and homology giving one example each of plant and animal respectively.

    (b) How are they considered as an evidence in support of evolution ? VIEW SOLUTION
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