EXERCISE - 1 NEETIIT.COM. - Phase (3) Anaphase (4) G 2. (1) Plectonemic (2) Paranemic (3) Helical (4) Irregular

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1 1. Synapsis found in between - (1) Nonhomologous chromosome (2) Homologous chromosome (3) Nonhomologous and homologous chromosome (4) Chromatids 2. During cytokinesis in plants, which of the following secretes the middle lamella - (1) Golgibody (2) SER (3) RER (4) Lysosomes 3. Pairing of homologous chromosomes is called- (1) Disjunction (2) Synapsis (3) Segregation (4) Polyteny 4. What type of division lead to coenocytic condition- (1) Cryptomitosis (2) Endomitosis (3) Free nuclear div. (4) Dino-mitosis 5. In which stage the centromere lie at equator and arms are directed towards poles - (1) Metaphase of mitosis (2) Metaphase - I (3) Metaphase - II (4) (1) and (3) both 6. Chromosomal morphology (Structure) is best observed at- (1) Prophase (2) Metaphase (3) Interphase (4) Anaphase 7. Cell plate which appears during cytokinesis, ultimately transforms in - (1) Middle lamella (2) Primary wall (3) Sec. wall (4) Plasma membrane 8. Each daughter chromosome in anaphase moves towards opposite poles at the speed of 1 m per minute with the expenditure of energy- (1) 5 ATP (2) 30 ATP (3) 38 ATP (4) 200 ATP 9. Synthesis and storage of ATP molecules required for cell div. takes place in- (1) Prophase (2) G 1 - Phase (3) Anaphase (4) G 2 - Phase 10. In mitosis, the spindle is- (1) Bipolar (2) Multipolar (3) Apolar (4) Random 11. Chiasmata appears during- (1) Diakinesis (2) Synaptotene (3) Diplotene (4) Leptotene 12. Coiling of chromonema in prophase of mitosis is- EXERCISE - 1 (1) Plectonemic (2) Paranemic (3) Helical (4) Irregular 13. How many microspore mother cells are required to produce 80 male gametes in angiosperms- (1) 10 (2) 20 (3) 40 (4) Chromosome number in gynoecium is 12, then in endosperm it will be- (1) 18 (2) 36 (3) 12 (4) The main difference between a dividing animals and plant cell lies in- (1) Cell plate formation (2) Coiling of chromosome (3) Chromosome movement (4) Types of spindle fibres 16. Cytoplasmic structures involved in cell division are - (1) Mitochondria (2) Ribosomes (3) Lysosomes (4) Centrioles 17. Cell division is not present in the cells of- - Free NEET & IIT Study Meterial & Papers Page - 1

2 (1) Skin (2) Gonads (3) Brain (4) Bone marrow 18. Before cell division, the entire DNA content of the cell gets doubled during interphase. This doubling takes place - (1) At the beginning of the interphase (2) At the end of the interphase (3) Throughout the interphase (4) Somewhere during the middle of the interphase 19. Where can we study mitosis- (1) Brain (2) Nail base (3) Legs (4) Kidneys 20. Tetrad is made of - (1) Four non homologous chromatids (2) Four homologous chromosomes with four chromatids (3) Four non homologous chromosomes (4) Two homologous chromosomes each with two chromatids 21. During meiotic cells division, genetic recombinations between two homologous chromosomes are facilitate by- (1) Movement of centromeres (2) Extrusion of polar bodies (3) Movement of centrioles (4) Formation of synaptonemal complex 22. Meiosis I is reductional division. Meiosis II is equational division due to - (1) Pairing of homologous chromosomes (2) Separation of chromatids (3) Disjunction of homologous chromosomes (4) Crossing over 23. In the somatic cell cycle - (1) In G 1 phase DNA content is double the amount of DNA present in the original cell (2) DNA replication takes place in S-phase (3) A short interphase is followed by a long mitotic phase (4) G 2 phase is followed by mitotic phase 24. What is true about cell cycle - (a) During G 1 phase there is active synthesis of RNA and proteins but no change in its DNA content (b) In synthesis or S phase each chromosome carries a duplicate set of genes (c) During G 2 phase a cell contains double the amount of DNA present in the original diploid cell (2n) (d) In S-phase a cell doubles the original diploid (2n) chromosome number (1) c and (2) a, b and c (3) all (4) b, c and d 25. Mitosis is not found in- (1) Cartilage cells (2) Bone cells (3) Nerve cells (4) All of the above 26. If the cells in the root of an angiosperm have 12 chromosomes, 6 chromosomes will be present in- (1) Synergid (2) Endosperm cell (3) Leaf cell (4) Cotyledonary cell 27. The number of chromosomes present in the leaf tip cells of a plant species, having six chromosomes in each of the four cells of its pollen tetrad, would be- (1) Three (2) Six (3) Twelve (4) Twenty four 28. At which stage during meiotic prophase I the synaptic forces, between homologous chromosomes, are the maximum- (1) Leptotene (2) Zygotene (3) Pachytene (4) Diplotene 29. The number of chromatids in a chromosome at metaphase is - (1) Two each in meiosis and mitosis (2) Two in mitosis and one in meiosis (3) Two in mitosis and four in meiosis (4) One in mitosis and two in meiosis - Free NEET & IIT Study Meterial & Papers Page - 2

3 30. Find out the incorrect statement - (1) Balbiani rings (puffs) are the sites of RNA synthesis (2) Cytokinesis refers to the division of cytoplasm (3) Tetrad is made of two homologous chromosomes each with two chromatids (4) The chromosome end is called nucleolus 31. Decondensation of chromosome occurs in - (1) Prophase (2) Metaphase (3) Anaphase (4) Telophase 32. The quantity of DNA in a chromosome at metaphase is - (1) Two each in meiosis and mitosis (2) Two in mitosis and one in meiosis (3) Two in mitosis and four in meiosis (4) One in mitosis and two in meiosis 33. A red blood cell was kept in a solution for a few minutes, where it got burst. The solution taken was - (1) Hypotonic (2) Concentrated sugar solution (3) Isotonic (4) Hypertonic 34. Function of telomeres in nucleus is - (1) Poleward movement (2) To initiate the RNA synthesis (3) To seal the ends of chromosome (4) To recognise the homologous chromosome 35. The salivary gland chromosomes in the dipteran larvae, are useful in gene mapping because - (1) These are fused (2) These are much longer in size (3) These are easy to stain (4) They have endoreduplicated chromosomes 36. DNA synthesis takes place in - (1) S phase (2) G 1 phase (3) G 2 phase (4) None 37. When pairing occurs in chromosomes (meiosis) - (1) Leptotene (2) Zygotene (3) Pachytene (4) Diakinesis 38. Most active stage of cell cycle is - (1) Prophase (2) Metaphase (3) Telophase (4) Interphase 39. Which of the following is the method of cytokinesis in plant cell - (1) By cell plate formation(2) By constriction (3) By phragmoplast (4) (1) and (3) both 40. In which stage of cell cycle nucleus becomes bigger - (1) G 1 (2) G 2 (3) S (4) M 41. What happens in interkinesis - (1) DNA - replication (2) Chromosome duplication (3) Preparation of second meiotic div. (4) Resting stage 42. Which can be observed in an interphase nucleus under the light microscope - (1) Chromosomes (2) Nucleosomes (3) Centromere (4) Heterochromatin 43. Angular divergence of spindle decreases at - (1) Metaphase (2) Early anaphase (3) Late anaphase (4) Telophase 44. Minimum number of meiotic div. required to produce 62 pollengrains - (1) 15 (2) 31 (3) 62 (4) 16 - Free NEET & IIT Study Meterial & Papers Page - 3

4 45. In cell cycle, changes of which stage are not visible under microscope - (1) Interphase (2) Prophase (3) Metaphase (4) Anaphase 46. Which type of division leads to polyploidy- (1) Cryptomitosis (2) Meiosis (3) Endomitosis (4) Amitosis 47. Which of the following not occurs in Anaphase - I but occurs in Anaphase - II - (1) Condensation of chromosomes (2) Poleward movement of chromosome (3) Contraction of spindle fibres (4) Splitting of centromere 48. In which stage of cell division, division of matrix of chromosome occurs - (1) Late prophase (2) Early metaphase (3) Late metaphase (4) Anaphase 49. During G 2 - phase a diploid cell contains the amount of DNA equal to a - (1) Diploid cell (2) Tetraploid cell (3) Haploid cell (4) Nothing can be said 50. Crossing over takes place in- (1) Zygotene (2) Pachytene (3) Diplotene (4) Diakinesis 51. A contractile mid body forms during cytokinesis in - (1) Animals (2) Higher plants (3) Fungi (4) Algae 52. In which order, cytokinesis occurs in plants - (1) Centripetal (2) Centrifugal (3) Oblique (4) Equatorial 53. Meiosis not occurs in- (1) Ovule (2) Anther (3) Microsporangia (4) Shoot tip 54. Which of the two events restore the normal number of chromosomes in life cycle - (1) Mitosis and Meiosis (2) Meiosis and fertilisation (3) Fertilisation and mitosis (4) Only meiosis 55. Number of meiosis required to produce 100 ovules in angiosperms - (1) 125 (2) 100 (3) 25 (4) Constancy of the chromosome number in sexually producing generation is brought by the process of- (1) Meiosis (2) Mitosis (3) Amitosis (4) None 57. Amitosis is characteristic of - (1) Higher plants (2) Higher animals (3) Bryophyta (4) Lower organisms 58. Slipping of chiasmata towards the ends of bivalent is called - (1) Terminalisation (2) Diakinesis (3) Interkinesis (4) Heteropycnosis 59. Which does not occurs in prophase - (1) Hydration of chromatin (2) Dehydration of chromatin (3) Appearance of chromosome (4) Disappearance of nuclear membrane and nucleolus 60. During cell cycle, RNA and protein synthesis takes place during- (1) G 1 and G 2 - phase (2) S - phase (3) M - phase (4) Cytokinesis 61. In which stage of cell division, number of chromosomes best counted - (1) Prophase (2) Metaphase (3) Telophase (4) Interphase 62. Cell division in blue green algae similar to that in- - Free NEET & IIT Study Meterial & Papers Page - 4

5 (1) Bacteria (2) Brown algae (3) Green algae (4) Higher plants 63. The synaptonemal complex was first observed by- (1) Moore (1905) (2) Farmer and Moore (1905) (3) Mosses (1956) (4) Flemming (1882) 64. A cell is bound to divide, it it has entered - (1) G 2 : phase (2) G 1 - phase (3) Prophase (4) S - phase 65. How many Chromosome shall be present in a diploid cell at mitotic anaphase it its egg cell has ten chromosome- (1) 10 (2) 20 (3) 30 (4) If crossing - over occur at two strand stage then percentage of crossing over is - (1) 50% (2) 60% (3) 70% (4) 100% 67. Meiosis which occur at the time of spore formation is called - (1) Zygotic meiosis (2) Haplontic meiosis (3) Terminal meiosis (4) Intermediate meiosis 68. Chromosome exhibit high level of coiling at which phase of karyokinesis - (1) Prophase (2) Metaphase (3) Telophase (4) Interphase 69. The synaptonemal complex appears - (1) Between homologous chromosomes (2) In zygotene stage (3) Composed of DNA + protein (4) All the above 70. At anaphase - II of meiosis each chromosome contains - (1) 4 DNA (2) 3 DNA (3) 2 DNA (4) 1 DNA 71. During cell division chromosome move towards different poles due to - (1) Centriole (2) Vacuole formation (3) Microtubules (4) Cytokinesis 72. For studying meiosis the relevant plant material usually fixed around - (1) 9-10 AM (2) 4.5 AM (3) 3.5 PM (4) 12 PM 73. Tetrad formation in meiosis occur is - (1) Leptotene (2) Zygotene (3) Pachytene (4) Diplotene 74. In Anaphase - I each chromosome composed of- (1) One chromatid (2) Two chromatid (3) Four chromatid (4) Many chromatid 75. In meiosis, division of centromere occurs during - (1) Interphase (2) Anaphase - I (3) Anaphase - II (4) Metaphase - I 76. In meiosis, nuclear membrane and nucleolus disappear during - (1) Zygotene (2) Pachytene (3) Diakinesis (4) Metaphase - I 77. Cell cycle can remain arrested at - (1) G 1 (2) S (3) G 2 (4) M 78. Which of the following are mitotic poisons - (1) Colchicine (2) Mustard gas and Azides(3) Cyanides (4) All the above 79. In cell cycle, which stage is misnomerly called resting phase - (1) S - phase (2) Telophase (3) Cytokinesis (4) Interphase 80. Separation of homologous chromosomes during Anaphase - I is called - - Free NEET & IIT Study Meterial & Papers Page - 5

6 (1) Synapsis (2) Disjunction (3) Nondisjunction (4) Crossing over 81. In tetrad, the number of non cross chromatids is normally - (1) Four (2) Two (3) One (4) None 82. Sporic meiosis occurs in - (1) Animals (2) Thallophyta (3) Bryophyta (4) All plants except thallophyta 83. If a meristematic cell is placed in a medium containing radio active thymidine, radioactivity will be first observed in- (1) Euchromatin (2) Hetero chromatin (3) Both simultaneously (4) None of the above 84. The metabolism of a cell which decreases during prophase again starts increasing during- (1) Telophase (2) Anaphase (3) Metaphase (4) G 1 - Phase 85. Synthesis of cycline protein occurs in- (1) Permanent tissue (2) Meristem (3) Lignified cells (4) All the types of cell 86. During which stage a diploid cell becomes tetraploid in mitosis - (1) G 2 (2) Prophase (3) Metaphase (4) Anaphase 87. 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 Homologous chromosomes shows maximum attraction during- (1) Leptotene (2) Zygotene (3) Pachytene (4) Diplotene 89. Ribonuclease, a mitotic poison, inhibits cell cycle in- (1) Interphase (2) Prophase (3) Metaphase (4) Anaphase 90. Dinomitosis occurs in- (1) Procaryotes (2) Mesokaryotes (3) Eucaryotes (4) Akaryotes 91. Stain for cell division- (1) Saffranin (2) Aniline blue (3) PAS (4) Acetocarmine 92. Terminal meiosis occurs in- (1) Sporocyte (2) Gametocyte (3) Zygote (4) Gamete ANSWER-SHEET Qus Ans Qus Ans Qus Ans Qus Ans Qus Ans Free NEET & IIT Study Meterial & Papers Page - 6

CELL CYCLE AND CELL DIVISION

1 CH 10 CELL CYCLE & CELL DIVISION CELL CYCLE AND CELL DIVISION Growth and reproduction are characteristics of living cells and organisms. Cell Cycle The sequence of events by which a cell duplicates its