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NEET - 2019 Previous Year Questions



NEET Biology Previous Year Questions - 2019

Variations caused by mutation, as proposed by Hugo de Vries, are:

[class-xii ]

  • random and directionless
  • random and directional
  • small and directional
  • small and directionless
  • Correct Option: A  [ random and directionless ]

    Remark:

n a species, the weight of newborn ranges from 2 to 5 kg. 97% of the newborn with an average weight between 3 to 3.3kg survive whereas 99% of the infants born with weights from 2 to 2.5 kg or 4.5 to 5 kg die. Which type of selection process is taking place?

[class-xii ]

  • Stabilizing Selection
  • Directional Selection
  • Disruptive Selection
  • Cyclical Selection
  • Correct Option: A  [ Stabilizing Selection ]

    Remark:

Match the hominids with their correct brain size :

(A)Homo habilis (I)900 cc
(B)Homo neanderthalensis (II)1350 cc
(C)Homo erectus (III)650-800 cc
(D)Homo sapiens (IV)400 cc
Select the correct option.

[class-xii ]

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

    Remark:

Identify the correct pair representing the causative agent of typhoid fever and the confirmatory test for typhoid.

[class-xii ]

  • Salmonella typhi/Widal test
  • Salmonella typhi/Anthrone test
  • Streptococcus pneumoniae/Widal test
  • Plasmodium vivax/UTI test.
  • Correct Option: A  [ Salmonella typhi/Widal test ]

    Remark:

Concanavalin A is:

[class-xii ]

  • an alkaloid
  • a lectin
  • an essential oil
  • a pigment
  • Correct Option: B  [ a lectin ]

    Remark:

Which of the following immune responses is responsible for rejection of kidney graft?

[class-xii ]

  • Cell-mediated immune response
  • Inflammatory immune response
  • Humoral immune response
  • Cell-mediated immune response
  • Correct Option: A  [ Cell-mediated immune response ]

    Remark:

Drug called 'Heroin' is synthesized by:

[class-xii ]

  • methylation of morphine
  • glycosylation of morphine
  • acetylation of morphine
  • nitration of morphine
  • Correct Option: C  [ acetylation of morphine ]

    Remark:

What triggers activation of protoxin to active Bt toxin of Bacillus thuringiensis in boll worm?

[class-xii ]

  • Body temperature
  • Moist surface of midgut
  • Acidic pH of stomach
  • Alkaline pH of gut
  • Correct Option: D  [ Alkaline pH of gut ]

    Remark:

Select the incorrect statement:

[class-xii ]

  • Inbreeding selects harmful recessive genes that reduce fertility and productivity
  • Inbreeding increases homozygosity
  • Inbreeding is essential to evolve purelines in any animal
  • Inbreeding helps in accumulation of superior genes elimination of undesirable genes
  • Correct Option: A  [ Inbreeding selects harmful recessive genes that reduce fertility and productivity ]

    Remark:

Match the following organisms with the products they produce:

(A)Lactobacillus (I)Cheese
(B)Saccharomyces cerevisiae (II)Curd
(C)Aspergillus niger (III)Citric Acid
(D)Acetobacter aceti (IV)Bread
(V)Acetic Acid
Select the correct option.

[class-xii ]

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

    Remark: