ISC Class 12 Biology Solved Question Paper 2014

Short Answer Type

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Give reasons for the following:                                                                          

At higher temperatures, green plants start evolving CO2 instead of O2.                                          

At higher temperatures, green plants start evolving CO2 instead of O2 due to photorespiration, where RubisCO functions as RuBP oxygenase. The photosynthetically fixed carbon is lost by photorespiration

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    Expand the following :

    (i) SCID

    (ii) ZIFT

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    Give reasons for the following:  

    Genetic code is ‘universal’.

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    Give reasons for the following:                                                                                                

    Secondary growth does not occur in monocot stems.
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    Long Answer Type

    (a) Name and define the three types of natural selection.
    (b) State the following:
    (i) Hardy Weinberg’s principle
    (ii) Theory of recapitulation

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    Short Answer Type

    Give reasons for the following:                

    Testes descend into the scrotum before birth.

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    Give reasons for the following:                                                                      
    Nitrogenous fertilisers are not applied in fields where leguminous crops grow.

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    Describe the Miller and Urey experiment on the origin of life.

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    State the best known contribution of:
    (i) Alec Jeffery
    (ii) P.K. Sethi
    (iii) Hugo de Vries

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    (b) Define the following:

    (i) Frame shift mutations.
    (ii) Genetic drift.

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