CBSE Class 12 Biology Set 1 - (57/3/1) 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.

  Assertion (A): Trichoderma species are free living fungi that are very common in the root ecosystems.
  Reason (R): They are effective bio-control agents of several plant pathogens.
  

  • 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.

  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.

  The foetal ejection reflex in human triggers the release of _______ hormone from _______

  • oxytocin, foetal pituitary
    
  • oxytocin, maternal pituitary
    
  • human chorionic gonadotropin, placenta
    
  • progesterone, corpus luteum
    
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• 5.

  Arrange the following in the correct sequence of their evolution and select the correct option:
  (i) Seaweed
  (ii) Invertebrates
  (iii) Jawless fish
  

  • (i), (ii), (iii)
  • (i), (iii), (ii)
  • (ii), (iii), (i)
  • (ii), (i), (iii)
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• 6.

  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 lactalbumin.
  

  • 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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