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NEET-XII-Biology

Previous Year Paper year:2017

with Solutions - page 2
 
  • Qstn #60
    Which of the following components provides sticky character to the bacterial cells ?
    (1) Gylcocalyx
    (2) Cell wall
    (3) Nuclear membrane
    (4) Plasma membrane
    digAnsr:   1
    Ans : (1)
    Sol. Glycocalyx is the outer most part of bacterial envelope which is either composed of slimy layer (Dextrin
    sugar) or capsule form
  • Qstn #61
    An example of colonial alga is :
    (1) Spirogyra
    (2) Chlorella
    (3) Volvox
    (4) Ulothrix
    digAnsr:   3
    Ans : (3)
    Sol. Volvox forms colony which rolls over water - colony of volvox is termed coenobium.
  • Qstn #62
    A dioecious flowering plant prevents both :
    (1) Cleistogamy and xenogamy
    (2) Autogamy and xenogamy
    (3) Autogamy and geitonogamy
    (4) Geitonogamy and xenogamy
    digAnsr:   3
    Ans : (3)
    Sol. Dioecious flowing plant means sex organs are present on separate plants which will prevent both autogamy
    (within same flower and geitonogamy (between two different flower of same plant)
  • Qstn #63
    Plants which produce characteristic pneumatophores and show vivipary belong to :
    (1) Hydrophytes
    (2) Mesophytes
    (3) Halophytes
    (4) Psammophytes
    digAnsr:   3
    Ans : (3)
    Sol. Halophytes grows in saline conditions so show pheumatophores of vivipary






  • Qstn #64
    Coconut fruit is
    (1) Capsule
    (2) Drupe
    (3) Berry
    (4) Nut
    digAnsr:   2
    Ans : (2)
    Sol. Coconut is a drupe fruit
  • Qstn #65
    Which of the following is made up of dead cells ?
    (1) Phloem
    (2) Xylem parenchyma
    (3) Collenchyma
    (4) Phellem
    digAnsr:   4
    Ans : (4)
    Sol. Phellem is made up of dead cells
  • Qstn #66
    Root hairs develop from the region of :
    (1) Meristematic activity
    (2) Maturation
    (3) Elongation
    (4) Root cap
    digAnsr:   2
    Ans : (2)
    Sol. Root hair develop from region of maturation
  • Qstn #67
    Which of the following options best represents the
    enzyme composition of pancreatic juice ?
    (1) Lipase, amylase, trypsinogen, procarboxypeptidase
    (2) Amylase, peptidase, trypsinogen, rennin
    (3) Amylase, pepsin, trypsinogen, maltase
    (4) Peptidase, amylase, pepsin, rennin
    digAnsr:   1
    Ans : (1)
    Sol. Pancreas produces pancreatic juice which is released in duodenum along with bile juice & contains enzymes
    as such lipase, amylase trypsinogen & procarboxypeptidase.
  • Qstn #68
    Zygotic meiosis is characteristic of :
    (1) Chlamydomonas
    (2) Marchentia
    (3) Fucus
    (4) Funaria
    digAnsr:   1
    Ans : (1)
    Sol. Zygotic meiosis - Haplontic life cycle eg. Chlamydomonas
    Marchantia Haplo-diplontic Sporic meiosis
    Fucus Diplontic Sporic meiosis
    Funaria Haplo-diplontic Sporic meiosis





  • Qstn #69
    Which of the following are found is extreme saline conditions ?
    (1) Mycobacteria
    (2) Archaebacteria
    (3) Eubacteria
    (4) Cyanobacteria
    digAnsr:   2
    Ans : (2)
    Sol. Halophiles form of Archebacteria are found in extreme saline conditions
  • Qstn #70
    In Bougainvillea thorns are the modifications of :
    (1) Leaf
    (2) Stipules
    (3) Adventitious root
    (4) Stem
    digAnsr:   4
    Ans : (4)
    Sol. In bougainvillea the throns are modifications of stem
  • Qstn #71
    Viroids differ from viruses in having
    (1) RNA molecules without protein coat
    (2) DNA molecules with protein coat
    (3) DNA molecules without protein coat
    (4) RNA molecules with protein coat
    digAnsr:   1
    Ans : (1)
    Sol. Viroids have only low molecular weight RNA without protein coat
  • Qstn #72
    Adult human RBCs are enucleate. Which of the following statements(s) is / are most appropriate explanation for
    this feature ?
    ( a) They do not need to reproduce
    (b) They are somatic cells
    (c) They do not metabolize
    (d) All their internal space is available for oxygen transport Options :
    (1) (b) and (c)
    (2) Only (d)
    (3) Only (a)
    (4) (a), (c) and (d)
    digAnsr:   2
    Ans : (2)
    Sol. Adult human RBCs are enucleated, this helps in increased availability of space for haemoglobin. This feature
    is benificial for carrying more oxygen.



  • Qstn #73
    Which of the following RNAs should be most abundant in animal cell ?
    (1) mi-RNA
    (2) r-RNA
    (3) t-RNA
    (4) m-RNA
    digAnsr:   2
    Ans : (2)
    Sol. rRNA - approx 80% of cellular RNA
  • Qstn #74
    During DNA replication, Okazaki fragments are used to elongate.
    (1) The lagging strand away from the replication fork
    (2) The leading strand towards replication fork
    (3) The lagging strand towards replication fork
    (4) The leading strand away from replication
    digAnsr:   1
    Ans : (1)
    Sol. In replication fork, leading and lagging strand are away from each other, Okazaki fragments are present on
    lagging strand.
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