CBSE Class 12 Biology Set 2 - (57/2/2) Question Paper 2026 with Solution PDF

CBSE CLASS XII Questions

• 1.

  The idea of use and disuse of organs for evolution of organism was proposed by
  

  • Charles Darwin
    
  • Thomas Malthus
    
  • Hugo De Vries
    
  • Lamarck
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• 2.

  Identify the stage of follicle where primary oocyte undergoes first meiotic division. Also mention the products of this division.
  

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• 3.

  Assertion (A) : The population of melanized moths increased in areas after Industrial Revolution.
  Reason (R) : In Industrial environment lichen covered trees were replaced by soot-covered trees offering better camouflage to dark coloured moths.
  

  • 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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• 4.

  Which of the following statements about plasmids is incorrect?
  

  • Plasmids have the ability to replicate within the bacterial cell.
    
  • Their replication is controlled by chromosomal DNA.
    
  • They are autonomously replicating circular extra-chromosomal DNA.
    
  • They often carry antibiotic resistant genes.
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• 5.

  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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• 6.

  A DNA molecule is 160 base pairs long. It has 30% Guanine. How many Adenine bases are present in this DNA molecule?

  • 48
    
  • 64
    
  • 96
    
  • 192
    
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