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Board Paper of Class 12-Science 2016 Biology Delhi(SET 3) - 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
    State a difference between a gene and an allele. VIEW SOLUTION
  • Question 2
    Suggest the breeding method most suitable for animals that are below average in milk productivity. VIEW SOLUTION
  • Question 3
    Suggest a technique to a researcher who needs to separate fragments of DNA. VIEW SOLUTION
  • Question 4
    Excessive nutrients in a fresh water body cause fish mortality. Give two reasons. VIEW SOLUTION
  • Question 5
    Give an example of a codon having dual function. VIEW SOLUTION
  • Question 6
    Discuss the role the enzyme DNA ligase plays during DNA replication. VIEW SOLUTION
  • Question 7
    Distinguish between the roles of flocs and anaerobic sludge digesters in sewage treatments. VIEW SOLUTION
  • Question 8
    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 9
    Plants that inhabit a rain-forest are not found in a wetland. Explain. VIEW SOLUTION
  • Question 10
    Angiosperms bearing unisexual flowers are said to be either monoecious or dioecious. Explain with the help of one example each. VIEW SOLUTION
  • Question 11
    What is a GMO? List any five possible advantages of a GMO to a farmer. VIEW SOLUTION
  • Question 12
    Suggest and describe a technique to obtain multiple copies of a gene of interest in vitro. VIEW SOLUTION
  • Question 13
    (a) Name any two fowls other than chicken reared in a poultry farm.
    (b) Enlist four important components of poultry farm management. VIEW SOLUTION
  • Question 14
    Why is breast-feeding recommended during the initial period of an infant's growth? Give reasons. VIEW SOLUTION
  • Question 15
    Describe the experiment that helped Louis Pasteur to dismiss the theory of spontaneous generation of life. VIEW SOLUTION
  • Question 16
    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 17
    Give an example of an autosomal recessive trait in humans. Explain its pattern of inheritance with the help of a cross. VIEW SOLUTION
  • Question 18
    Explain with the help of suitable examples the three different ways by which organisms overcome their stressful conditions lasting for short duration. VIEW SOLUTION
  • Question 19
    How has RNAi technique helped to prevent the infestation of roots in tobacco plants by a nematode Meloidegyne incognitia? VIEW SOLUTION
  • Question 20
    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 21
    "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 22
    How would you find genotype of a tall pea plant bearing white flowers? Explain with the help of a cross. Name the type of cross you would use. 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
    Answer the following questions based on Hershey and Chases's experiments:

    (a) Name the kind of virus they worked with and why?

    (b) Why did they use two types of culture media to grow viruses in ? Explain.

    (c) What was the need for using a blender and later a centrifuge during their experiments?

    (d) State the conclusion drawn by them after the experiments.
     
    OR

    (a) How did Darwin explain adaptive radiation ? Give another example exhibiting adaptive radiation.

    (b) Name the scientist who influenced Darwin and how ? VIEW SOLUTION
  • Question 25
    (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 26
    (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
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