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NEET - October 2020 Previous Year Questions



NEET Biology Previous Year Questions - October 2020

Inbreeding depression is:

NEET-(Oct)2020 [Strategies-for-Enhancement-in-Food-Production] [class-xii ]

  • Reduced motility and immunity due to close inbreeding
  • Decreased productivity due to mating of superior male and inferior female
  • Decrease in body mass of progeny due to continued close inbreeding
  • Reduced fertility and productivity due to continued close inbreeding
  • Correct Option: D  [ Reduced fertility and productivity due to continued close inbreeding ]

    Remark:

Cyclosporin A, used as immuno suppression agent, is produced from:

NEET-(Oct)2020 [Microbes-in-Human-Welfare] [class-xii ]

  • Monascus purpureus
  • Saccharomyces cerevisiae
  • Penicillium notatum
  • Trichoderma polysporum
  • Correct Option: D  [ Trichoderma polysporum ]

    Remark:

Match the following columns and select the correct option:

Column-I Column-II
(A)Dragonflies (I)Biocontrol agents of several plant pathogens
(B)Bacillus thuringiensis (II)Get rid of Aphids and mosquitoes
(C)Glomus (III)Narrow spectrum insecticidal applications
(D)Baculoviruses (IV)Biocontrol agents of lepidopteran plant pests
(V)Absorb phosphorus from soil

NEET-(Oct)2020 [Microbes-in-Human-Welfare] [class-xii ]

  • (A)-(III), (B)-(V), (C)-(IV), (D)-(I)
  • (A)-(II), (B)-(I), (C)-(III), (D)-(IV)
  • (A)-(II), (B)-(III), (C)-(IV), (D)-(V)
  • (A)-(II), (B)-(IV), (C)-(V), (D)-(III)
  • Correct Option: D  [ (A)-(II), (B)-(IV), (C)-(V), (D)-(III) ]

    Remark:

Match the following techniques or instruments with their usage:

Column-I Column-II
(A)Bioreactor (I)Separation of DNA fragments
(B)Electrophoresis (II)Production of large quantities of products
(C)PCR (III)Detection of pathogen, based on antigen - antibody reaction
(D)ELISA (IV)Amplification of nucleic acids

NEET-(Oct)2020 [Biotechnology-Principles-and-Processes] [class-xii ]

  • (A)-(III), (b)-(II), (c)-(IV), (d)-(I)
  • (A)-(II), (b)-(I), (c)-(IV), (d)-(III)
  • (A)-(IV), (b)-(III), (c)-(II), (d)-(I)
  • (A)-(II), (b)-(I), (c)-(III), (d)-(IV)
  • Correct Option: B  [ (A)-(II), (b)-(I), (c)-(IV), (d)-(III) ]

    Remark:

First discovered restriction endonuclease that always cuts DNA molecule at a particular point by recognising a specific sequence of six base pairs is:

NEET-(Oct)2020 [Biotechnology-Principles-and-Processes] [class-xii ]

  • EcoR1
  • Adenosine deaminase
  • Thermostable DNA polymerase
  • Hind II
  • Correct Option: D  [ Hind II ]

    Remark:

Select the correct statement from the following:

NEET-(Oct)2020 [Biotechnology-Principles-and-Processes] [class-xii ]

  • Gel electrophoresis is used for amplification of a DNA segment.
  • The polymerase enzyme joins the gene of interest and the vector DNA.
  • Restriction enzyme digestions are performed by incubating purified DNA molecules with the restriction enzymes of optimum conditions.
  • PCR is used for isolation and separation of gene of interest.
  • Correct Option: C  [ Restriction enzyme digestions are performed by incubating purified DNA molecules with the restriction enzymes of optimum conditions. ]

    Remark:

In a mixture, DNA fragments are separated by:

NEET-(Oct)2020 [Biotechnology-Principles-and-Processes] [class-xii ]

  • Bioprocess engineering
  • Restriction digestion
  • Electrophoresis
  • Polymerase chain reaction
  • Correct Option: C  [ Electrophoresis ]

    Remark:

In Recombinant DNA technology antibiotics are used:

NEET-(Oct)2020 [Biotechnology-Principles-and-Processes] [class-xii ]

  • to keep medium bacteria-free
  • to detect alien DNA
  • to impart disease-resistance to the host plant
  • as selectable markers
  • Correct Option: D  [ as selectable markers ]

    Remark:

RNA interference is used for which of the following purposes in the field of biotechnology?

NEET-(Oct)2020 [Biotechnology-and-its-applications] [class-xii ]

  • to develop a plant tolerant to abiotic stresses
  • to develop a pest resistant plant against infestation by nematode
  • to enhance the mineral usage by the plant
  • to reduce post harvest losses
  • Correct Option: B  [ to develop a pest resistant plant against infestation by nematode ]

    Remark:

The laws and rules to prevent unauthorised exploitation of bio-resources are termed as:

NEET-(Oct)2020 [Biotechnology-and-its-applications] [class-xii ]

  • Biopatenting
  • Bioethics
  • Bioengineering
  • Biopiracy
  • Correct Option: A  [ Biopatenting ]

    Remark: