CBSE Class 12 Biotechnology Compartment Question Paper 2022 with Answer Key (August 23, Set 4- 99)

CBSE CLASS XII Questions

• 1.

  Given below is an equation describing the growth pattern of a population :

  \( \dfrac{dN}{dt} = rN \)

  (a) Mention the type of growth model or growth pattern of the population described by the given equation.

  (b) What does r in the equation signify ?

  (c) Mention the type of growth curve that will be obtained if the population density (N) is plotted against time (t).

  (d) According to you, will the resource availability be limited or unlimited for this type of growth in the given population ?

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• 2.

  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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• 3.

  Cattle or goats are never seen browsing on the weed, Calotropis. Select the correct option for the reason.

  • The plant produces highly poisonous tannins.
  • The plant produces quinine, which is bitter in taste.
  • The plant produces the poisonous chemical, cardiac glycoside.
  • The plant bears prickles.
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• 4.

  Explain how the following microbes act as biocontrol agents :

  (a) Bacillus thuringiensis

  (b) Nucleopolyhedrovirus

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• 5.

  Match the IUDs in Column I with suitable example in Column II.

  Column I	Column II
  a. Non-medicated	i. Lippes loop
  b. Copper releasing	ii. LNG-20
  c. Hormone releasing	iii. Multiload 375

  • a-iii, b-ii, c-i
  • a-i, b-ii, c-iii
  • a-i, b-iii, c-ii
  • a-ii, b-i, c-iii
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• 6.

  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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