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Board Paper of Class 12 2016 Biology - Solutions


  • Question 1
    (a) Give a brief answer for each of the following:
    (i) What is central dogma?
    (ii) Define cryopreservation.
    (iii) What is symbiosis?
    (iv) Explain the term perianth.

    (b) Each of the following question(s)/statement(s) has four suggested answers. Choose the correct option in each case.
    1. The curve showing the amount of light absorbed at each wavelength is:
    (i) Action spectrum
    (ii) Absorption spectrum
    (iii) Quantum yield
    (iv) Quantum requirement

    2. After fertilisation, the integument of an ovule develops into:
    (i) Seed
    (ii) Seed coat
    (iii) Fruit
    (iv) Fruit wall

    3. Meselson and Stahl’s Experiment proved:
    (i) Transduction
    (ii) Transformation
    (iii) DNA is the genetic material
    (iv) Disruptive DNA replication

    4. The act of expelling the full term foetus from the uterus is termed as:
    (i) Gestation
    (ii) Implantation
    (iii) Parturition
    (iv) Capacitation

    (c) Give scientific terms for each of the following:
    (i) The smallest unit of DNA which can mutate.
    (ii) Type of water absorption by roots where metabolic energy is required.
    (iii) Statistical study of human population.
    (iv) Multiple effects of a gene on the phenotype of an organism.

    (d) Expand the following abbreviations:
    (i) rDT
    (ii) BAC
    (iii) SSBP
    (iv) IUCD

    (e) Name the scientists who have contributed to the following:
    (i) Reverse transcription
    (ii) Photorespiration
    (iii) Principle of limiting factors
    (iv) Photolysis of water VIEW SOLUTION

  • Question 2
    (a) Mention three features of the Neanderthal Man.

    (b) Differentiate between connecting link and missing link.

    (c) What is adaptive radiation? VIEW SOLUTION

  • Question 3
    (a) Give an account of Lederberg’s replica plating experiment to show the genetic basis of evolution.

    (b) Define phylogeny.

    (c) What is Founder’s effect? VIEW SOLUTION

  • Question 4
    (a) With reference to the levels of organisation, differentiate between living organisms and non-living objects.

    (b) Mention one cause for variation in nature.

    (c) What is the difference between the teeth of apes and the teeth of man? VIEW SOLUTION

  • Question 5
    (a) Give a graphic representation of the C3 cycle.

    (b) Discuss the role of cambium in secondary growth of dicot stems.

    (c) State two advantages of vegetative propagation. VIEW SOLUTION

  • Question 6
    (a) Explain the role of hormones during the menstrual cycle.

    (b) Give four adaptations shown by flowers pollinated by wind.

    (c) Give two differences between heart wood and sap wood. VIEW SOLUTION

  • Question 7
    (a) Explain chemiosmotic hypothesis for ATP synthesis.

    (b) Draw a neat labelled diagram of the vertical section of a monocot leaf.

    (c) Mention any two functions of the human placenta. VIEW SOLUTION

  • Question 8
    (a) Explain the process of sex determination in honey bees.

    (b) Define complete linkage. Give an example of a cross, showing complete linkage.

    (c) Write a short note on Multiple Ovulation Embryo Transfer Technology. VIEW SOLUTION

  • Question 9
    (a) Give an account of artificial chromosomes in transfer of genetic material.

    (b) Mention any four methods involved in the treatment of cancer.

    (c) What is RNA interference? Give any one application of RNA interference. VIEW SOLUTION

  • Question 10
    (a) What is Integrated Pest Management?

    (b) Explain the structure of a typical antibody molecule.

    (c) Why are bio-fertilizers preferred over chemical fertilizers? VIEW SOLUTION
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