NEET Biology Solved Question Paper 2017

Multiple Choice Questions

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Select the correct combination of statements regarding Myasthenia gravis.

  1. It is an auto-immune disorder.
  2. It causes insufficient acetylcholine binding that effects muscular contraction.
  3. Antibodies are developed against acetylcholine
  4. Antibodies are developed against acetylcholine receptors.
  5. It causes drooping of eyelids.

  • I, III, IV,V

  • I, III,V II

  • I, II, IV, V

  • II, III, IV, V

A.

I, III, IV,V

Statements I, II, IV and V are correct. Myasthemia Gravis is an auto immune neuromuscular disease that is congenital. It leads to muscle weakness. It caused by circulating to muscle weakness. It is caused by circulating antibodies that block acetylcholine receptors at the post-synaptic neuromuscular junction inhibiting the excitatory effects of acetylcholine and nicotic receptors at neuromuscular junctions. The first noticeable symptom is weakening of eye muscle leading to drooping of eyelids.

It is treated medically with acetylcholine esterase inhibitors or immuno-suppressants.

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    Organ of Jacobson helps in

    • Touch

    • Vision

    • Smell

    • Hearing

    Answer

    Match the following columns.

    Column I Column II
    A. Pinocytosis 1. Euglena Gracillis
    B. Hotozoic 2. Paramecium
    C. Parasitic 3. Amoeba Proteus
    D. Mixotrophic 4. Monocystis

    • A B C D
      3 2 4 1
    • A B C D
      2 3 4 1
    • A B C D
      4 3 1 2
    • A B C D
      1 4 2 3
    Answer

    Post-mitotic gap phase is characterised by all, except

    • Synthesis of RNA and nucleotides

    • No change in DNA content

    • Synthesis of histone proteins

    • Growth phase of the hell

    Answer

    Following are the two statements regarding the origin of life.

    1. The earliest organisms that appeared on the earth were non-green and presumably an aerobes.
    2. The first autotrophic organisms were the chemoautotrophs that never released oxygen of the above statements which on of the following options is correct?

     

    • II is correct, but I is false

    • Both I and II are correct

    • Both I and II are false

    • I is correct, but II is false

    Answer
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    Sliding filament theory can be best explained as

    • When myofilaments slide pass each other actin filaments shorten while myosin filament does not shorten

    • Actin-myosin filaments shorten and slide pass each other

    • Actin and myosin filaments do not shorten, but rather slide pass each other

    • When myofilament slide passes each other myosin filament shorten while actin filament do not shorten.

    Answer

    Study the following statements and select the option with correct statements.

    1. Pulvinus leaf base is present in some leguminous plants
    2. In Eichhornia, the petioles expand becomes green and synthesise food.
    3. Opposite phyllotaxy is seen in guava.

    • I and II

    • I and III

    • II and III

    • I, II and III

    Answer

    Phellogen and phellem respectively denote

    • Cork and cork cambium

    • Cork cambium and cork

    • Secondary cortex and cork

    • Cork and secondary cortex

    Answer

    The chromosome in which centromere is situated close to one end are

    • Metacentric 

    • Acrocentric

    • Telocentric

    • Sub-metacentric

    Answer
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    Which one correctly describe reproduction and life cycle of fern?

    • Spore → Gamete → Prothallus → Sporophyte

    • Gamete → Spore → Prothallus → Plant

    • Prothallus → Sporophyte → Gamete → Fern

    • Sporangia → Spore → Prothallus → Sporophyte → Plant

    Answer