CBSE Class 12 Biology Question Paper 2009 Set 57 1 1

CBSE CLASS XII Questions

• 1.

  (i) Differentiate between a DNA and RNA nucleotide.

  (ii) Name the two types of bonds present within a single nucleotide.

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• 2.

  Assertion (A) : The milk produced by transgenic cow 'Rosie' was nutritionally more balanced product for human babies than natural cow milk.
  Reason (R) : It was human protein enriched milk containing human alpha lactaglobulin.
  

  • Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of the Assertion (A).
    
  • Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of the Assertion (A).
    
  • Assertion (A) is true, but Reason (R) is false.
    
  • Assertion (A) is false, but Reason (R) is true.
    
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• 3.

  List two major causes of loss of biodiversity.
  

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• 4.

  Assertion (A) : The two chains of DNA have antipolarity.

  Reason (R) : In one chain of DNA, ribose sugar at \(5^{\prime}\) end consists of a free phosphate moiety, while at the other end, the ribose sugar has free \(3^{\prime}\) - OH group.

  • Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of the Assertion (A).
  • Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of the Assertion (A).
  • Assertion (A) is true, but Reason (R) is false.
  • Assertion (A) is false, but Reason (R) is true.
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• 5.

  Choose a correct option that shows an interaction in which one species benefits while the other is neither harmed nor benefitted.

  • Mycorrhizal associations between fungi and roots of higher plants
    
  • Sea anemone and clownfish
    
  • Abingdon tortoises and goats in the Galapagos Island
    
  • Cuscuta on hedge plants
    
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• 6.

  Assertion (A) : The pyramid of biomass in a pond aquatic ecosystem is always inverted.

  Reason (R) : The biomass of consumers like fishes far exceeds that of the producers like phytoplanktons.

  • Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of the Assertion (A).
  • Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of the Assertion (A).
  • Assertion (A) is true, but Reason (R) is false.
  • Assertion (A) is false, but Reason (R) is true.
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