Tuesday, March 10, 2015


Cell Cycle and Cell Division

1.        Assertion (A) : Mitosis is called equational division
           Reason    (R) : During mitotic cell cycle the cellular D.N.A doubles once, the chromosome number doubles once without any gene recombinations and the nucleus also divides once
         1)  A and R are true and R is the correct explanation of A.
         2)  A and R are true and R is not the correct explanation of A.
         3)  A is true, R is false.                                          4)  A is false, R is true.
2.        Which of the following haploid and diploid cells in flowering plant body  divide by mitosis
           1) Pollen grains and pollen mother cells             2) Megaspores and megaspore mother cell
           3) Pollen grains and meristematic cells               4) pollen grains and megaspores
3.        Match the following
           List – I                         List – II
           A) G0  phase                I) Cell grows without synthesis of cytoplasmic contents
           B) G1 phase                 II) Inactive stage of cell cycle
           C) S phase                   III) Cell grows with the synthesis of cytoplasmic contents
           D) G2 phase                 IV) Cell grows with metabolic activity but without D.N.A replication
                                                V) D.N.A of the cell doubles
           The correct match is
                     A              B               C               D                                  A               B              C              D
           1)      II              IV             V               I                      2)           II               IV             V              III
           3)      II              III             IV             V                     4)           II               I                IV             III
4.        Nuclear envelope E.R Golgi complex and Nucleolus disappear and reappear respectively during
           1) Early prophase and early Telophase               2) Early Metaphase and late Anaphase
           3) Late prophase and Late Telophase                 4) Late Metaphase and early Anaphase
5.        The ratio between the number of metaphasic chromatids and anaphasic chromosomes in a mitocyte is
           1) 1 : 2                          2) 1 : 1                            3) 2 : 1                                  4) 1 : 4
6.        Mitosis is significant for
           A) Maintaining identical genetic continuity in the daughter cells as that of parent cell
           B) Repair of injured organs                             C) Restoration of nucleo –cytoplasmic ratio
           D) Disturbance of the ratio between nucleus and cytoplasm
           1) A, B only                 2) B, C only                   3) A, B, C                            4) A, B, C, D
7.        In a meiocyte, interphase immediately followed by
           1) Prophase I                2) Telopohase I              3) Prophase II                      4) Metaphase I
8.        Assertion (A) : Prophase I of meiosis is more complex and long lasting when compared to prophase of mitosis
           Reason  (R) : Prophase I of meiosis includes synapsis of homologous chromosomes, crossing over and gene recombinations
         1)  A and R are true and R is the correct explanation of A.
         2)  A and R are true and R is not the correct explanation of A.
         3)  A is true, R is false.                                          4)  A is false, R is true.
9.        Which of the following does not occur during Prophase I
           1) Formation of bivatents                                   2) condensation of chromosomes
           3) Terminalization of chiasmata                          4) Splitting of centromeres
10.      The ratio between number of sequencial nuclear divisions, the number of times of D.N.A replication, and the number times chromosome number doubles in meiosis is
           1) 1 : 1 : 1                     2) 2 : 1 : 1                       3) 1 : 2 : 1                             4) 2 : 1 :2
11.    Number of meiocytes found in each ovule of Pisum sativum
          1) 7                                2) 1                             3) 2                             4) Many
12.    Find the correct match
            List   I                                                                                                List  II
          I. Splitting of centromere                                                                A. Telophase –II
          II. Synapsis                                                                                         B. Anaphase – I
          III. Complete separation of homologues of a bivalent             C. prophase – I
          IV. Four haploid nuclei                                                                    D. Anaphase - II     
                        I          II         III       IV                               I          II         III       IV
          1)           A         B         C         D                     2)        D         C         A         B
          3)           D         C         B         A                     4)        C         D         A         B
13.    Identify the true statement
          I. Meiosis ensures the production of haploid phase
          II. Fertilization ensures the production of diploid phase
          III. Gametes are always diploid
          1) I only                        2) I & II                      3) I, II & III                 4) III only
14.    Number of spindle apparatii formed to produce 4 male gametes from its pollen mother cell   
          1) 8                                2) 5                             3) 11                           4)7
15.    Number of chromatids found in G1, pachytene and at each pole of anaphase –I  in the meiocyte of  Rice
          1) 24,96, 48                 2) 24,48, 12               3) 12,24,12                4) 24,48,24
16.    Disjunction refers to
           1) the separation of homologous chromosomes at anaphase – II
           2) the type of chromosomal aberration in which there is loss of a part of a chromosome
           3) incompatibility in fungi and other thallophytes
           4) the separation of homologous chromosomes at anaphase – I
17.    Colchicine alkaloid shows its activity on
           1) Anaphase of meiosis                                 2) Cytokinesis           
           3) Anaphase of mitosis                                  4) Metaphase of mitosis
18.    Identify the correct statement
          1) Interkinesis is the stage between two mitotic divisions
          2) Interkinesis is generally short lived
          3)  Replication of DNA occurs during interkinesis
          4) Interkinesis is followed by Prophase – I
19.    What is the total number of chromosomes found in the tetrad of Potato  ?
          1) 48                             2) 24                           3) 36                           4) 96
20.     Select the incorrect statement?
1)The number of mitotic spindle apparatti involved during development of monosporic type of embryosac  from its functional megaspore is seven
2)The number of mitotic divisions involved during development of monosporic type of  embryosac is seven
3)The number of mitotic divisions involved during development of mature  male gametophyte of an angiosperm from its microspore is two
4)The number of nuclear cycles that occur during the formation of microspore tetrad from its mother cell is one
21.       Assertion(A): Mitosis is also known as equational division
Reason (R): Mitosis occurs both in somatic and reproductive cells of plants
1)Both A & R are true R is the correct explanation of A
2) Both A & R are true R is not the correct explanation of A  
3)A is true but R is false                                             4)A is false but R is true 
22.       Study the following and identify the correct statements ?
I)Both the strands of a DNA are replicas of one another during ‘S’ phase
II) Splitting of centromere and separation of sister chromatids occur during anaphase of mitosis and anaphase-II of meiosis
III)Decondensation of chromosomes and condensation of chromosomal material occur during prophase and telophase respectively
IV)Number of nuclear envelopes disappear during meiosis are two
1 )II & IV                         2) I, III & IV                    3) II only                            4) III & IV only
23.       Find out the correct statement(s) from the following
I)In animals mitotic cell division is seen in the diploid somatic cells
II)Karyokinesis begins with prophase and ends with telophase
III)The number of nuclei that get divided in meiosis are three
IV)In higher plants single bipolar spindle apparatus is formed during mitosis
1)I, II & IV                       2)I,  III & IV only            3) II only                            4)I II III & IV
24.       Assertion(A):During meiosis chromosome number is reduced to half at each pole in anaphase-I
Reason(R):During anaphase-I bivalents moves to respective opposite poles
1)Both A & R are true R is the correct explanation of A
2) Both A & R are true R is not the correct explanation of A  
3)A is true but R is false                                             4)A is false but R is true 
25.       Study the following table with regard to onion meiocyte and  identify the correct combinations
(Note : Cytokinesis occurs after meiosis – I)
Phase                                Chromosome number     Chromatid number
I)Anaphase-II                  16                                      32
II)Anaphase-I                  16                                      32
III)Metaphase-II              8                                        8
IV)Metaphase-I               16                                      32
1)I II III & IV                                2)I & IV                                         3)II & III                                          4)II & IV
26. Identify the true statements
       i) Coenocytic formation  happens when cytokinesis is not followed by karyokines in a cell
       ii) Cell is undergoing cell division to restore the nucleo – cytoplasmic ratio
       iii) In a cell cycle, if cells exit   phase to enter an inactive stage called quiescent stage for not undergoing division
       iv) In animals mitotic division is only seen in the haploid somatic cells
       1) except iii                      2) only iv                     3) except i                   4) only ii
27.  Based upon the chromosomal number in their gamets, arrange the following organisms in ascending manner
       A)Fruit fly                      B)Apple                      C)Butterfly                D Potato         E) Dog
       1) DBECA                       2) BDEAC                  3) ADEBC                  4) ABDEC
28.  Concept related to “Interkinesis ’’
       1) It is the phase between two successive “ M phases ’’
       2) It is the phase between two successive cell cycles
       3) It is the stage between the two meiotic divisions of a meiosis
       4) It is the stage between two successive cytokinesis
29.  Among the following events which are not considered as prophase-I events
       I) Process of synopsis                 II)Diad of cells           III)Bivalent formation
       IV) Terminalisation of chiasmata         V) Dissolution of synapto nemal complex
       VI) Chromosomal division
       1) I, II & IV                     2) II & IV                   3) III, IV, V & VI      4) II, III & IV
30.  Identify the incorrect statement
        1) There is no increase in the chromosomal number during S phase of interphase
        2) In the quiescent stage  of the cycle, the cells remain metabolically inactive, but no longer proliferate
        3) Mitosis is essential for the cell to restore the nucleo-cytoplasmic ratio
        4) Plants can show mitotic divisions in both haploid and diploid cells
31.  Identify the incorrect match
       1) Spindle fibers are attached to kinetochores – Metaphase
       2) Centrioles begin to move towards opposite poles-Anaphase
       3) Initiation of condensation of chromatin – Prophase
       4) Nucleolus, Golgi complex  and ER resynthesised – Telophase
32.  Find true statement regarding meiotic division
       No.of times of                 No.of times of            No.of times of            No.of Spindle
       Replications                    Karyokinesis              Cytokinesis                 apparatii
       1) 2                                               2                                  2                                 2
       2) 1                                               2                                  2                                 3
       3) 2                                               2                                  1                                 1
       4) 2                                               2                                  2                                 2
33.    The duration which is required for formation of two cells from one human cell is provided to yeast cell, it form how many cells?
         2) 26 cells                        2) 210 cells                      3) 216 cells                            4) 218 cells
34.    Statement I: Animals can show mitotic divisions in both haploid and diploid cells
         Statement II: Plants can show mitotic division only in diploid somatic cells
         1) Both statements are true                                   2) Both statements are false
         3) Statement I is true but statement II is false      4) Statement I is false but statement II is true
35.    Which cells in the adult animals do not appear to exhibit division?
         1) Liver cells                   2) Bone marrow cells     3) Heart cells                        4) Skin cells
36.    In G1 phase of interphase, the number of chromosomes and amount of DNA in plant cell is14 and 2c respectively. In G2 phase the number of chromosomes and amount of DNA respectively is
         1) 14 and 2C                   2) 14 and 4C                  3) 28 and 4C                        4) 28 and 2C
37.    Which phase is called as phase of apparent division
         1) Go phase                   2) G1 phase                     3) G2 phase                              4) M phase
38.     Duplication of centriole in animal cells occurs during
          1) G1 – phase                 2) S- phase                    3) G2 – phase                4) G0 – phase
39.     The duration of cell cycle in yeast cells is
          1) 24 hours                    2)  1 hour                      3) 90 minutes                4) 48 hours  
40.     In which phase of Interphase, the cell is metabolically active and grows continously

          1) G0 – phase                2) G1 – phase                3) S – phase                  4) G2– phase

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