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Which of the following not ocurs in Anaphase-I but, occurs in Anaphase=Il :~, , (1) Condensation of chromosomes, , (2) Poleward movernent of chromosome, , (3) Contraction of spindle fibers, , (4) Splitting of centromere, , During G, - phase a diploid cell contains the amount, of DNA equal to a :, (1) Diploid cell, , (2) Tetraploid cell, , (3) Haploid cell, , (4) None of the above, , Crossing over takes place in :, , (1) Zygotene (2) Pachytene, , (3) Diplotene (4) Diakinesis, , A contractile mid body forms during cytokinesis in :(1) Animals (2) Higher plants, , (3) Fungi (4) Algae, , In which order, cytokinesis occurs in plants :(1) Centripetal (2) Centrifugal, (3) Oblique (4) Equatorial, , Which of the two events restore the normal number, of chromosomes in life cycle ?, , (1) Mitosis and Meiosis, , (2) Meiosis and fertilisation, , (3) Fertlisation and mitosis, , (4) Only meiosis, , Match the column-I with cohumn—t and select the, correct answer :, Column-I Column-Il, (A) Pachytene @) Bouquet stage, {B) Zygotene (i) Chiasma visible, {C) Diplotene (ii) ~~ Terminalisation, {D) Leptotene (is Gene exchange, (F} ~— Diakinesis (wy) Synapsis, , (1) A-i, B-ii, C-iii, D-iv, E-v, (2) Av, B-v, C-i, DA, E-ii, (3) A-ii, Bov, C-v, D-ii, E-i, (4) A-ii, B-iii, C-iv, D-i, E-v, , , , 10., , 11., , 12., , 13., , 14., , 15., , 16., , Which part of plant is suitable for the study of meiosis, , (1) Root apex, (2) Ovary, , (3) Anther, , (4) Shoot apex, , Chromosomal movement in Anaphase occurs with the, help of =, (1) Astral rays (2) Centrioles, , (3) NOR (4) Spindle fibres, Nuclear envelope reappears at :, (1) Metaphase (2) Prophase, , (3) Anaphase (4) Telophase, , Slipping of chiasmata towards the ends of bivalent, is called :~, , (1) Terminalisation, (3) Interkinesis, , (2) Diakinesis, (4} Congression, , In meiosis, how many cycles of chromosome division, occurs ?, , (1) One (2) Four, (3) Two (4) Three, Which does not occurs in prophase ?, , (1) Decondensation of chromatin, , (2) Condensation of chromatin, , (3) Appearance of chromosome, , (4) Disappearance of nuclear membrane and, nucleolus, , In which stage of cell division, number of, , chromosomes best counted:(1) Prophase (2) Metaphase, (3) Telophase (4) Interphase, , How many chromosome shall be present in a diploid, cell at mitotic anaphase if its egg cell has ten, chromosome:, (1) 10 (Ten) (2) 20 (Twenty), , (3) 30 (Thirty) (4) 40 (Forty), Chromosome exhibit high level of coiling at which, phase of karyokinesis:, (1) Prophase (2) Metaphase, , {3} Telophase (4) Interphase

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a, , 17., , 18., , 19., , 20,, , 21., , 22., , 23., , 24., , 26., , “Bouquet-stage” occur in which sub stages of, prophase -1 ?, (1) Leptotene, (3) Pachytene, , (2) Zygotene, (4) Diplotene, , At anaphase - II of meiosis each chromosome, , contains:, (1) 4 DNA (2)3-DNA, (3) 2- DNA (4)1-DNA, , In which stage of mitosis, the chromosomes are, composed of two chromatids ?, , (1) Prophase & metaphase, , (2) Anaphase and telophase, , (3) Prophase and telophase, , (4) Metaphase and anaphase, , In Anaphase -1 each chromosome composed of:(1) One chromatid (2) Two chrornatid, (3) Four chromatid (4) Many chromatid, , Gap between division phase and start of, DNA-replication is called :, (1) G, - phase (2) Gz - phase, , (3) M - phase (4) Interkinesis, , In meiosis, division of centromere occurs during:(1) Interphase (2) Anaphase - I, , (3) Anaphase - II (4) Metaphase - I, , In meiosis, nuclear membrane and nucleolus, disappear during :~, , (1) Zygotene (2) Pachytene, , (3) Diakinests (4) Metaphase - |], , In cell cycle, which stage is misnomerly called, resting phase :—, , (1) S-phase (2) Telophase, , (3) Cytokinesis (4) Interphase, Separation of homologous chromosomes during, Anaphase - 1 is called :, , (1) Synapsis {2} Disjunction, , (3) Nondisjunction {4) Crossing over, , During cell division, spindle fibers attach to which, part of chromosome :, (1) Primary constriction, , (2) Secondary constriction, , (3) Telomere, , (4) Satellite, , , , 27., , 29., , 31,, , 32., , 33., , Diakinesis represents :, (1) transition to prophase, (2) transition to metaphase, (3) transition to anaphase, (4) transition to telophase, , Synaptonemal complex is characteristic of :—, , (1) Mitotic chromosomes, , (2) Leptotene chromosomes, , (3) Paired meiotic chromosomes, , (4) Metaphase, , During which stage a diploid cell becomes tetraploid, in mitosis:, (I) G,, , (3) Metaphase, , (2) Prophase, (4) Anaphase, , Division of centromere occurs in:(1) Prophase, , (2) Metaphase, , (3} Anaphase, , (4) Telophase, , Fach chromosome composed of one chromatid in:(1) Anaphase - |, , (2) Anaphase — II, , (3) Metaphase —I, , (4) Metaphase ~ II, , If the number of bivalents are 8 in metaphase — I,, what shall be the number of chromosomes in, daughter cells after meiosis - I and meiosis ~ II, , respectively:(1) 8 and 4 {2}4 and 4, (3) 8 and 8 (4) 16 and 8, , Which one of the following statements is correct ?, (1) Cell divided by cytokinesis only in mitosis, (2) DNA Is replicated before the start of meiosis, only, (3) Spindles consisting of microtubules are formed, only in mitosis, (4) Exchange of genetic materials occurs only, in meiosis, , Which of the following not occurs in Anaphase 4, {1) Segregation of homologous chromosomes, {2) Shorlening in spindle, , (3) Poleward movement of chromosomes, , (4) Division of centromere

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35., , 36., , 37., , 38., , 39., , 40., , 41., , 42., , In meiosis :, (1) Division of nucleus twice but replication of DNA, only once, , (2) Division of nucleus twice and replication of DNA, twice, , (3) Division of nucleus once and replication of DNA, is also once, , (4) Division of nucleus once and DNA - replication, is twice, , After meiosis - 1, the two chromatids of a, , chromosome are :, (1) Genetically similar, , (2) Genetically different, , (3) There occurs only one chromatid in each, chromosome, , (4) None of the above, , Chiasmata appears during ;(1) Diakinesis (2) Synaptotene, (3) Diplotene (4) Leptotene, , What happens in synthesis phase during cell cycle:, (1} DNA synthesis, , (2) Chromosome number becomes double, , (3} Formation of two nuclei, , (4} Synthesis of tubulin proteins, , Reappearance of nuclear membrane & nucleolus, along with thining & elongation in chromosomes, are diagnostic characters for the phase:, (1) Anaphase (2) Metaphase, (3) Interphase (4) Telophase, Condensation of chromosomes and appearance of, astral rays occur during :~, , (1) Prophase (2) Metaphase, (3} Anaphase (4) Telophase, During telophase :, (1) Nuclear membrane is formed, , (2) Nucleolus appears, , (3) Astral rays disappear, , (4) All the above, , Chromosomal morphology (Structure) is best, observed at :(1) Prophase, (3) Interphase, , (2) Metaphase, (4) Anaphase, , , , 43., , 44., , 45., , 416,, , 47., , 49., , 51., , 52., , Pairing of homologous chromosomes is called:, (1) Disjunction (2) Synapsis, {3) Segregation (4) Polyteny, Preparation phase of mitosis is :~, , (1) G,-phase (2) S-phase, {3) Prophase (4) Interphase, Synaptonemal complex first appear :—, (1) Leptotene (2) Pachytene, (3) Zygotene (4) Diplotene, , The correct sequence of prophase- of meiosis is —, , {1) Leptotene, pachytene, zygotene, diplotene,, diakinesis, , (2) Leptotene, diplotene, pachytene, zygotene,, diakinesis, , (3) Leptotene, zygotene, pachytene, diplotene,, diakinesis, , (4) Leptotene, zygotene, diakinesis, diplotene, , M-phase of cell cycle consist of =~, , (1) G,, S and G, phase, , (2) Prophase, Metaphase, Anaphase, Telophase, , (3) Interphase, Prophase, Metaphase, Anaphase,, Telophase, , (4) Only prophase, , If the cell is diploid in G, than after the S phase, cell remain/become :, (Q)n (2) 4n, , (3) 8n (4) 2n, , Nuclear membrane disappears in :—, , (1) Late prophase (2) Early prophase, (3) Metaphase (4) Telophase, , Pre - DNA synthesis phase is:, (1) G) - phase (2) Gz - phase, , (3) S-phase (4) Prophase, , Which of the following Is called heterotypic, division :, (1) Meiosis, (3) Mitosis, , (2) Meiosis—Il, (4) Amitosis, , DNA replication is found in —, , (1) Mitosis and meiosis—1, , (2) Mitosis and meiosis] and meiosis—Il, (3) Meiosis only, , (4) Mitosis only

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53., , 54., , 55,, , 57,, , 59., , 61., , Thick-thread stage occured in :—, (1) Leptotene (2) Zygotene, (3) Pachytene (4) Diplotene, , How many times divisions will occur in an isolated, tip cell to form 128 cells ?, (1) 128 (2) 127 (3) 32, , In which stage the DNA is doubled :(1) Metaphase (2) Anaphase, {3} Interphase (4) Prophase, , ‘The significance of Meiosis is that it , (1) Produce four cells having chromosomal number, equal to mother cell, , (2) Occurs in all types of cells, , (3} Maintains the constant Chromosomes number, to a particular species, , (4) Growth of animal body ograns, , Cell Cycle of an ordinary animal cell , (4)7, , (1) 2n Mrosis 1, __Fenilization o, __ Meiosis, , 6. 2, a en, , Foruiliasaicen Mitosis, , (3) 2n Melodie 2n Qn, , Mitosis., , (4) 2n Pettilixvation {n) 2n Meiosis n, , The number of DNA in chromosome at Gy state of, cell cycle =, (1) One {2) Two, , (3)Four (4) Eight, , Crossing over that results in genetic recombination, in higher organisms occurs between —, , (1) Non-sister chromatids of a bivalent, , (2} Two daughter nuclei, , (3) Two different bivalents, , (4) Sister chromatids of a bivalents, , In the somatic cell cycle :, (1) DNA replication takes place in S-phase, , (2) A short interphase is followed by a long mitotic, phase, , (3) G, phase follows mitotic phase, , (4) In G, phase DNA content is double the amount, of DNA present in the original cell, , When synapsis is complete all along the, chromosome, the cell is said to have entered a stage, called, , (1) Zygotene, {3} Diplotene, , (2} Pachytene, (4) Diakinesis, , , , 67., , 69., , 70., , Many cells function properly and divide mitotically, even through they do not have :, (1) Plasma membrane —_{2) Cytoskeleton, , {3} Mitechondria {4) Plastids, , Centromere is required for —, , (1) Movement of chromosomes towards poles, (2) Cytoplasmic cleavage, , (3) Crossing over, , (4) Transcription, , At which stage of the cell cycle are histone proteins, synthesized in a eukaryotic cell ?, , (1) During telophase, , (2) During S-phase, , (3) During Gy-stage of prophase, , (4) During entire prophase, , If the n=16 in plant cell then what Js possible in, metaphase - | of meiosis ?, , (1) 32 Bivalents, , (2) 16 Telravalents, , (3) 16 Bivalents, , {4) 32 Bivalents, , Prophase which follows the S and G, phases of, interphase, is the first stage of :, (1) Meiosis-I (2) Karyokinesis, , 8) Interphase (4) G, phase, , The two asters together with spindle fibres form:(1) Mitotic apparatus (2) Asters, , (3) Astral fibres (4) Centrosome, , In prophase centrosome which had undergone, duplication during interphase, begins to move, towards :, , {1) Same poles of the cell, , (2) Opposite poles of the cell, , (3) One towards centre while another towards pole, (4) Both towards centre, , During prophase each centrosome radiates out, microtubules called :, (1) Mitotic apparatus, (3) Asters, , ‘Telophase is :, , (1) Final stage of karyokinesis, (2) Final stage of mitosis, , (3) Mid stage of karyokinesis, (4) First stage of cytokinesis, , (2) Spindle apparatus, (4) Spindle fibres

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EXERCISE-III(A) NCERT BASED QUESTIONS, , 1. Which one is correct for G, stage ?, 1 It is 2 quiescent stage., IL. In this phase cell cycle is stopped, Ill. G, cells do not grow or proliferate but, metabolically active, IV. G, cells can divide in response to some, stimulus, (1) All are correct, (2) LILI are correct, (3) LI] are correct, (4) Only I and IV are correct, 2. Which of the following is not correctly matches a, phase of the cell cycle with its function ?, (1) Second gap phase — Period of cytoplasnic, , growth, (2} First gap phase - Most of the organelle, duplication, (3) Interphase = Phase of preparation, for cell division, (4) DNA synthesis — Doubling of number of, phase chromosome in cell, , 3. Mark incorrect statements :(A) Meiosis involves only a single cycle of, , DNA replication, (B) Four haploid cells are formed at the end of, meiosis, (C) Meiosis occurs in diploid cells, {(D) In yeast, cell cycle takes about 90 minutes,, (1) Aand B (2) Aand C, (3) Only B (4) All are correct, , 4. Interval between mitosis and initiation of DNA, replication is called :, (1) G, - Phase (2) G, — phase, (3) Karyokinesis (4) S — phase, 5. Diploid cell in human, where cell division does not, occur ;fa) Heart cell {b) Muscle cell, {c) Nerve cell, (1) Only ¢ (2) b and c, (3} a andec (4) a, bande, , 6. — The events shown below occur during different, phases , A. Centromere splits, chromatids separate and, move to opposite poles, chromatids are now, called chromosome, , B. Chromosomes cluster at opposite poles,, decondensalion of chromosome, reappearance, of NM, GB and ER,, , , , a, (2), , @), , C, Chromosomal replication, , D. Kinetochores attach to spindle fibres and, chromosome are arranged at equatorial plate, , E. Condensation of chromosomal materials, , Which of the following correctly identifies each of, , the phases described, I ase | Mi, E, , D, E, A, , , , Arrange the following events of meiosis in the correct, sequence , A. Terminalisation of chiasmata, , B, Crossing over, , C. Synapsis, , D, Disjunction of chromosomes, , E. Dissolution of synaptonemal complex, The correct sequence is, WA >+BOC3ODSOE, (2E>D>C3BOA, CoBoOD>EOA, C>Bo»EoA>D, , Identify the following diagram, , , (1) Transition to Metaphase (mitosis), {2} Transition to Anaphase-ll (meiosis), {3) Transition to Metaphase-I (meiosis), (4) Transition to Anaphase (mitosis), , The drawing below shows a cell whose diploid, chromosome number is four. This cell is in:, , , (1) Metaphase of mitosis, , {2} Anaphase of mitosis, , (3) First anaphase of meiosis, (4) Second anaphase of meiosis