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CBSE Class 12 (Science) Biotechnology and its Applications — practice questions — page 2

Explore 66 free Biotechnology and its Applications questions in CBSE Class 12 (Science) Biology. Open each question or exercise to read its content, reference answers and available explanation.

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Biotechnology and its Applications questions and exercises with answers

Showing questions 31–60 of 66.

Which sugar serves as the carbon source in a tissue culture medium?Read the answer and worked solution →Which pair of growth regulators is added to plant tissue culture medium?Read the answer and worked solution →Which plant part is best for obtaining virus-free plants in culture?Read the answer and worked solution →Any plant part removed and grown in a sterile test tube is called what?Read the answer and worked solution →Plant cells with their walls digested away yield what structures?Read the answer and worked solution →Golden rice is enriched with which vitamin?Read the answer and worked solution →Pest-resistant GM crops mainly reduce reliance on which input?Read the answer and worked solution →The Bt toxin gene is obtained from which bacterium?Read the answer and worked solution →In what form does the Bt toxin exist inside the bacterium?Read the answer and worked solution →What activates the Bt protoxin crystals inside an insect?Read the answer and worked solution →Tobacco budworm and armyworm belong to which insect group?Read the answer and worked solution →Which common insects are coleopterans, killed by some Bt proteins?Read the answer and worked solution →Silencing of a specific mRNA by a complementary dsRNA is called what?Read the answer and worked solution →In which group of organisms does RNAi act as cellular defence?Read the answer and worked solution →The RNAi strategy protected the roots of which crop from a nematode?Read the answer and worked solution →Which vector delivered nematode-specific genes into tobacco cells?Read the answer and worked solution →About how many recombinant therapeutics are marketed in India?Read the answer and worked solution →What links insulin chain A to chain B?Read the answer and worked solution →Which stretch of pro-insulin is removed during maturation?Read the answer and worked solution →Which company made human insulin chains in E. coli in 1983?Read the answer and worked solution →How were separately made insulin chains A and B joined?Read the answer and worked solution →In ADA gene therapy, which cells are cultured and given functional cDNA?Read the answer and worked solution →Why do ADA patients need periodic infusion of engineered lymphocytes?Read the answer and worked solution →A permanent cure for ADA deficiency needs the gene in which cells?Read the answer and worked solution →In enzyme replacement therapy for ADA deficiency, what is injected?Read the answer and worked solution →Which technique amplifies HIV nucleic acid for detection?Read the answer and worked solution →A radioactive probe hybridised to cloned DNA is detected by what method?Read the answer and worked solution →What fraction of existing transgenic animals are mice?Read the answer and worked solution →Rosie's milk contained which human protein?Read the answer and worked solution →A transgenic animal protein is used to treat which disease?Read the answer and worked solution →

Worked practice questions

Which sugar serves as the carbon source in a tissue culture medium?

  1. Lactose
  2. Maltose
  3. Fructose
  4. Sucrose
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Correct answer: D. Sucrose

Cultured explants cannot photosynthesise well, so the medium supplies sucrose as the carbon source.

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Which pair of growth regulators is added to plant tissue culture medium?

  1. Auxins and cytokinins
  2. Ethylene and abscisic acid
  3. Gibberellins and ethylene
  4. Auxins and abscisic acid
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Correct answer: A. Auxins and cytokinins

Auxins and cytokinins together control cell division and differentiation of the cultured explant into roots and shoots.

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Which plant part is best for obtaining virus-free plants in culture?

  1. Mature leaf
  2. Root cap
  3. Meristem
  4. Xylem tissue
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Correct answer: C. Meristem

Even in a virus-infected plant the apical and axillary meristems are free of virus, so they regenerate healthy plants.

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