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NEET Botany MCQs: Class-XI and Class-XII



NEET Botany MCQs: Class-XI and Class-XII

Match Column - I with Column - II.

Column-I Column-II
(A)Nitrococcus (I)Denitrification
(B)Rhizobium (II)Conversion of ammonia to nitrite
(C)Thiobacillus (III)Conversion of nitrite to nitrate
(D)Nitrobacter (IV)Conversion of atmospheric nitrogen to ammonia
Choose the correct answer from the options given below:

[class-xi ]

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

    Remark:

Which of the following statements is incorrect?

[class-xi ]

  • Both ATP and NADPH + H+ are synthesized during non-cyclic photophosphorylation.
  • Stroma lamellae have PS I only and lack NADP reductase.
  • Grana lamellae have both PS I and PS II.
  • Cyclic photophosphorylation involves both PS I and PS II.
  • Correct Option: D  [ Cyclic photophosphorylation involves both PS I and PS II. ]

    Remark:

Which of the following statements is incorrect?

[class-xi ]

  • During aerobic respiration, role of oxygen is limited to the terminal stage.
  • In ETC (Electron Transport Chain), one molecule of NADH + H+ gives rise to 2 ATP molecules, and one FADH2 gives rise to 3 ATP molecules.
  • ATP is synthesized through complex V.
  • Oxidation-reduction reactions produce proton gradient in respiration.
  • Correct Option: B  [ In ETC (Electron Transport Chain), one molecule of NADH + H+ gives rise to 2 ATP molecules, and one FADH2 gives rise to 3 ATP molecules. ]

    Remark:

In some members of which of the following pairs of families, pollen grains retain their viability for months after release?

[class-xii ]

  • Poaceae ; Rosaceae
  • Poaceae; Leguminosae
  • Poaceae; Solanaceae
  • Rosaceae ; Leguminosae
  • Correct Option: D  [ Rosaceae ; Leguminosae ]

    Remark:

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

[class-xii ]

  • Transcribes rRNAs (28S, 18S and 5.8S)
  • Transcribes tRNA, 5s rRNA and snRNA
  • Transcribes precursor of mRNA
  • Transcribes only snRNAs
  • Correct Option: B  [ Transcribes tRNA, 5s rRNA and snRNA ]

    Remark:

DNA fingerprinting involves identifying differences in some specific regions in DNA sequence, called as:

[class-xii ]

  • Satellite DNA
  • Repetitive DNA
  • Single nucleotides
  • Polymorphic DNA
  • Correct Option: B  [ Repetitive DNA ]

    Remark:

Identify the correct statement.

[class-xii ]

  • In capping, methyl guanosine triphosphate is added to the 3' end of hnRNA.
  • RNA polymerase binds with Rho factor to terminate the process of transcription in bacteria.
  • The coding strand in a transcription unit is copied to an mRNA.
  • Split gene arrangement is characteristic of prokaryotes.
  • Correct Option: B  [ RNA polymerase binds with Rho factor to terminate the process of transcription in bacteria. ]

    Remark:

Plasmid pBR322 has PstI restriction enzyme site within gene ampR that confers ampicillin resistance. If this enzyme is used for inserting a gene for β-galactoside production and the recombinant plasmid is inserted in an E.coli strain

[class-xii ]

  • it will not be able to confer ampicillin resistance to the host cell.
  • the transformed cells will have the ability to resist ampicillin as well as produce β-galactoside.
  • it will lead to lysis of host cell.
  • it will be able to produce a novel protein with dual ability.
  • Correct Option: A  [ it will not be able to confer ampicillin resistance to the host cell. ]

    Remark:

Now a days it is possible to detect the mutated gene causing cancer by allowing radioactive probe to hybridise its complimentary DNA in a clone of cells, followed by its detection using autoradiography because:

[class-xii ]

  • mutated gene partially appears on a photographic film.
  • mutated gene completely and clearly appears on a photographic film.
  • mutated gene does not appear on a photographic film as the probe has no complimentarity with it.
  • mutated gene does not appear on photographic film as the probe has complimentarity with it.
  • Correct Option: C  [ mutated gene does not appear on a photographic film as the probe has no complimentarity with it. ]

    Remark:

In the exponential growth equation
Nt = N0ert, e represents:

[class-xii ]

  • The base of number logarithms
  • The base of exponential logarithms
  • The base of natural logarithms
  • The base of geometric logarithms
  • Correct Option: C  [ The base of natural logarithms ]

    Remark: