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NEET Zoology MCQs: Class-XI and Class-XII



NEET Zoology MCQs: Class-XI and Class-XII

Identify the microorganism which is responsible for the production of an immunosuppressive molecule cyclosporin A:

[class-xii ]

  • Clostridium butylicum
  • Aspergillus niger
  • Streptococcus cerevisiae
  • Trichoderma polysporum
  • Correct Option: D  [ Trichoderma polysporum ]

    Remark:

In-situ conservation refers to:

[class-xii ]

  • Conserve only high risk species
  • Conserve only endangered species
  • Conserve only extinct species
  • Protect and conserve the whole ecosystem
  • Correct Option: D  [ Protect and conserve the whole ecosystem ]

    Remark:

Given below are two statements:
Statement I: Restriction endonucleases recognise specific sequence to cut DNA known as palindromic nucleotide sequence.
Statement II: Restriction endonucleases cut the DNA strand a little away from the centre of the palindromic site.
In the light of the above statements, choose the most appropriate answer from the options given below:

[class-xii ]

  • Both Statement I and Statement II are incorrect
  • Statement I is correct but Statement II is incorrect
  • Statement I is incorrect but Statement II is correct
  • Both Statement I and Statement II are correct
  • Correct Option: D  [ Both Statement I and Statement II are correct ]

    Remark:

If '8' Drosophila in a laboratory population of '80' died during a week, the death rate in the population is ___________ individuals per Drosophila per week.

[class-xii ]

  • 10
  • 1.0
  • zero
  • 0.1
  • Correct Option: D  [ 0.1 ]

    Remark:

Detritivores breakdown detritus into smaller particles. This process is called:

[class-xii ]

  • Fragmentation
  • Humification
  • Decomposition
  • Catabolism
  • Correct Option: A  [ Fragmentation ]

    Remark:

[class-xi ]

  • Bacteria are exclusively heterotrophic organisms.
  • Slime moulds are saprophytic organisms classified under Kingdom Monera.
  • Mycoplasma have DNA, Ribosome and cell wall
  • Cyanobacteria are a group of autotrophic organisms classified under Kingdom Monera.
  • Correct Option: D  [ Cyanobacteria are a group of autotrophic organisms classified under Kingdom Monera. ]

    Remark:

Match List-I with List-II.

List-I List-II
(A)Bronchioles (I)Dense Regular Connective Tissue
(B)Goblet cell (II)Loose Connective Tissue
(C)Tendons (III)Glandular Tissue
(D)Adipose Tissue (IV)Ciliated Epithelium
Choose the correct answer from the options given below:

[class-xi ]

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

    Remark:

Match List-I with List-II.

List-I (Biological Molecules) List-II (Biological functions)
(A)Glycogen (I)Hormone
(B)Globulin (II)Biocatalyst
(C)Steroids (III)Antibody
(D)Thrombin (IV)Storage product
Choose the correct answer from the options given below:

[class-xi ]

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

    Remark:

Which one of the following statements is correct?

[class-xi ]

  • The tricuspid and the bicuspid valves open due to the pressure exerted by the simultaneous contraction of the atria
  • Blood moves freely from atrium to the ventricle during joint diastole.
  • Increased ventricular pressure causes closing of the semilunar valves.
  • The atrio-ventricular node (AVN) generates an action potential to stimulate atrial contraction
  • Correct Option: B  [ Blood moves freely from atrium to the ventricle during joint diastole. ]

    Remark:

Select the incorrect statement regarding synapses:

[class-xi ]

  • Electrical current can flow directly from one neuron into the other across the electrical synapse.
  • Chemical synapses use neurotransmitters
  • Impulse transmission across a chemical synapse is always faster than that across an electrical synapse.
  • The membranes of presynaptic and postsynaptic neurons are in close proximity in an electrical synapse.
  • Correct Option: C  [ Impulse transmission across a chemical synapse is always faster than that across an electrical synapse. ]

    Remark: