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NEET Botany MCQs: Class-XI and Class-XII



NEET Botany MCQs: Class-XI and Class-XII

In angiosperm, the haploid, diploid and triploid structures of a fertilized embryo sac sequentially are:

[class-xii ]

  • Synergids, antipodals and Polar nuclei
  • Synergids, Primary endosperm nucleus and zygote
  • Antipodals, synergids, and primary endosperm nucleus
  • Synergids, Zygote and Primary endosperm nucleus
  • Correct Option: D  [ Synergids, Zygote and Primary endosperm nucleus ]

    Remark:

What is the function of tassels in the corn cob?

[class-xii ]

  • To protect seeds
  • To attract insects
  • To trap pollen grains
  • To disperse pollen grains
  • Correct Option: C  [ To trap pollen grains ]

    Remark:

The phenomenon of pleiotropism refers to:

[class-xii ]

  • more than two genes affecting a single character.
  • presence of several alleles of a single gene controlling a single crossover
  • presence of two alleles, each of the two genes controlling a single trait
  • a single gene affecting multiple phenotypic expression.
  • Correct Option: D  [ a single gene affecting multiple phenotypic expression. ]

    Remark:

Frequency of recombination between gene pairs on same chromosome as a measure of the distance between genes to map their position on chromosome, was used for the first time by:

[class-xii ]

  • Henking
  • Thomas Hunt Morgan
  • Sutton and Boveri
  • Alfred Sturtevant
  • Correct Option: D  [ Alfred Sturtevant ]

    Remark:

What is the role of RNA polymerase III in the process of transcription in Eukaryotes?

[class-xii ]

  • Transcription of only snRNAS
  • Transcription of rRNAs (28S, 18S and 5.8S)
  • Transcription of tRNA, 5 srRNA and snRNA
  • Transcription of precursor of mRNA
  • Correct Option: C  [ Transcription of tRNA, 5 srRNA and snRNA ]

    Remark:

Expressed Sequence Tags (ESTs) refers to:

[class-xii ]

  • Certain important expressed genes.
  • All genes that are expressed as RNA.
  • All genes that are expressed as proteins
  • All genes whether expressed or unexpressed.
  • Correct Option: B  [ All genes that are expressed as RNA. ]

    Remark:

Unequivocal proof that DNA is the genetic material was first proposed by:

[class-xii ]

  • Wilkins and Franklin
  • Fedrick, Griffith
  • Alfred Hershey and Martha Chase
  • Avery, Macleoid and McCarthy
  • Correct Option: C  [ Alfred Hershey and Martha Chase ]

    Remark:

Upon exposure to UV radiation, DNA stained with ethidium bromide will show:

[class-xii ]

  • Bright orange colour
  • Bright red colour
  • Bright blue colour
  • Bright yellow colour
  • Correct Option: A  [ Bright orange colour ]

    Remark:

In gene gun method used to introduce alien DNA into host cells, microparticles of ______ metal are used.

[class-xii ]

  • Silver
  • Copper
  • Zinc
  • Tungsten or gold
  • Correct Option: D  [ Tungsten or gold ]

    Remark:

During the purification process for recombinant DNA technology, addition of chilled ethanol precipitates out:

[class-xii ]

  • Polysaccharides
  • RNA
  • DNA
  • Histones
  • Correct Option: C  [ DNA ]

    Remark: