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CBSE Class 12th Biology Solved Question Paper 2013 Set 1

Sep 9, 2013 12:36 IST

    Some questions from CBSE Class 12th Biology Question Paper (Set-1) are given here


    Q.Name an organism where cell division is itself is a mode of reproduction?
    Answer
    Cell division among amoeba, act as mode of reproduction.

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    image Q.When dose a human body elicit an anamnestic response?
    Answer
    Human body tends to generate anamnestic response when there is subsequent infection caused by a pathogen, or it may be called as secondary response.

    Q.Name any two diseases the Himgiri variety of wheat is resistant
    Answer
    Two diseases the himgiri variety of wheat is resistant are –
    a.Leaf and stripe rust
    b.Hill bunt

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    Q.State the role of transposons in silencing of mRNA in eukaryotic cells?
    Answer
    Silencing of a gene is done in order to prevent translation of mRNA, where transposons act as a complementary RNA that is used to stop translation. 

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    Q.Why are green algae not likely to be found in the deepest strata of the ocean?
    Answer
    Survival of green algae depends upon-  
    a.Presence of sufficient light for photosynthesis
    b.Presence of brackish water
    Deep inside the sea these two conditions are not available so green algae are no present in this level, instead algae inhabit littoral zone of water.

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