CBSE Class 12 Mathematics Question Paper 2022 with Answer Key (June 7, Set 3 - 65/4/3)

CBSE CLASS XII Questions

• 1.

  C-peptide of human insulin is :

  • a part of mature insulin molecule.
  • responsible for formation of disulphide bridges.
  • removed during maturation of pro-insulin to insulin.
  • responsible for its biological activity.
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• 2.

  Explain how the following microbes act as biocontrol agents :

  (a) Bacillus thuringiensis

  (b) Nucleopolyhedrovirus

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• 3.

  State the role of thymus as a lymphoid organ. Name the cells that are released from it and mention their functions.

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• 4.

  If a genetic disease is transferred from a phenotypically normal but carrier female to only some of the male progeny, the disease is :

  • autosomal dominant
  • autosomal recessive
  • sex-linked dominant
  • sex-linked recessive
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• 5.

  Assertion (A) : Besides curdling of milk, LAB also improves its nutritional quality by increasing Vitamin B₁₂.

  Reason (R) : LAB, when present in the stomach checks disease-causing microbes.

  • 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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• 6.

  Pollination success will be reduced unless the orchid flower co-evolves with the pollinator. Explain.

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