CBSE Class 12 Biology Question Paper 2010 Set 57 1

CBSE CLASS XII Questions

• 1.

  Which of the following is a secondary consumer ?

  • Grasshopper
  • Cow
  • Fish
  • Hawk
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• 2.

  Monascus purpureus is a yeast used commercially in the production of which one of the following?

  • Ethanol
    
  • Streptokinase
    
  • Citric acid
    
  • Statins
    
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• 3.

  "Indo-Burma" is considered as a hotspot. What is meant by the term "hotspots" in biodiversity ? List two criteria used for determining a "hotspot". Name any two hotspots of India.

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• 4.

  Assertion (A): The embryo with 8 to 16 blastomeres is called a morula.
  Reason (R): The morula continues to divide and transform into trophoblast.
  

  • 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.

  (i) Differentiate between a DNA and RNA nucleotide.

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

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• 6.

  Assertion (A) : Hardy-Weinberg principle says that allele frequencies in a population are stable.

  Reason (R) : Hardy-Weinberg principle is applicable only when genetic drift does not occur.

  • 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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