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Y&, choose the correct answer, , 1. Which statement is true of both chromosomes and, genes?, (a) Each codes for a specific protein., (b) Each may be copied and passed on in mitosis., (9) Each may be either dominant or recessive., (d) Each may exist as two or more alleles., , 2. Which of these structures, involved in cell, division, is present in animal cells but not higher, , plant cells?, (a) Centriole (b) Centromere, () Chromatid (d) Chromosome, , 3. At which stage in’ mitosis’ and meiosis do, chromosomes always line up at the equator of the, spindle?, , (a) Prophase (b) Telophase, () Anaphase (d) Metaphase, , 4. Spindle fibres play an important role in mitosis, and meiosis. Which biological molecule are, spindle fibres composed of?, , () Polysaccharide (b) Protein, (©) nucleic acid (a) Lipid, , - How many mitotic divisions of a meristematic cell, Ma root tip are needed to produce 256 daughter, , cells?, @) 8 (b) 16, (©) 32, & Abr, (a) 64, bnormal and uncontrolled mitosis in an organ, Will result ine, i) New organ ) Zygote, Cancer (d) gamete, , 10., , 11., , 12., , 13., , . Acell has five pairs of chromosomes. After mitotic, , division, the number of chromosomes in the, daughter cells will be:, (a) Five, , (c) Twenty, , (b) Ten, (a) Forty, , . The major event that occurs during the anaphase of, , mitosis, which brings about the equal distribution, of chromosomes, is:, , (a) Splitting of the centromeres, , (b) Splitting of the chromatids, , (c) Replication of the genetic material, , (d) Condensation of the chromatin, , . Which phase comes between Gi and G2 phase?, , (a) Go phase (b) M- phase, , (c) S phase (d): Interphase, , Equatorial plane is formed in:, , (a) Anaphase (b) Metaphase, , (c) Telophase (d) Interphase, , What defines a diploid nucleus?, , (a) A nucleus containing two unpaired, chromosomes., , (b) A nucleus with two alternative forms of a, gene., , (c) Anucleus with two separate threads of DNA., , (d) Anucleuscontaining twosets of chromosomes., , How does a haploid nucleus differ from a diploid, , nucleus of the same species?, , (a) It has different genes., , (b) It has fewer chromosomes., , (c) Ithas more alleles., , (d) It is the result of fertilisation., , What is produced when a cell undergoes mitosis, once?

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264 | Icse CHAPTERWISE MCQs (BIOLOGY) - x, , 14., , 15., , 16., , 17., , 18., , —, , (@) Four new cells which are different from each 19. Whatisnota function of meiosis? \, , other and from their parent cell,, , (®) Four new cells which are identical to each, other and to their parent cell,, , (c) Two new cells which are different from each, other and from their parent cell., , (d) Two new cells which are identical to each, other and to their parent cell., , When a cell divides, these events occur., , (i) The DNA inside the cell is duplicated exactly., , (ii) Daughter cells are produced with the same, , chromosome number as the parent cell. Which, , type of division has occurred?, , (a) Meiosis producing genetically different cells., , (b) Meiosis producing genetically identical cells., , (c) Mitosis producing genetically different cells., , (d) Mitosis producing genetically identical cells., , Some features of cell division are listed., , (i) Haploid cells are produced, , (ii) New cells are genetically identical, , (iii) Reduction division, , (iv) Results in variation, , Which features would be associated with meiosis?, , (a) (i), (ii) and (iii) (6) (i), (ii) and (iv), , (c) (i), (iii) and (iv) (d) (ii), (fii) and (iv), , Which of the following descriptions of mitosis is/, , are correct?, , (i) DNA synthesis occurs at the beginning of, prophase., , (ii) The nuclear envelope breaks down in, prophase and reforms in telophase., , (iii) The division of centromeres occurs in, anaphase., , (a) 1,2and3 (b) Only land 2, , (c) Only 2and3 (d) Only 1, , Which of the following is incorrect regarding, , structure of DNA?, , (i) Nucleotide is composed of pentose sugar,, nitrogenous bases and phosphate group., , (ii) Adenine pairs with Thymine and Guanine, pairs with Cytosine., , (iii) A=T, C-G, , (iv) DNA strand winds around the nucleosome,, which consists of eight pairs of histone, proteins., , (v) Genes are the fundamental unit of DNA., , (a) (ii) and (iii) only —(b) (i), (ii), (v) only, , (©) (iii) and (iv) only (d) None of them, , Cell division by meiosis of a parent cell with 23, , pairs of chromosomes will result in:, , (a) 2 cells, each with 23 pairs of chromosomes., , (b) 2 cells, each with 23 single chromosomes., , (©) 4cells, each with 23 pairs of chromosomes., , (d) 4 cells, each with 23 single chromosomes., , 20., , 21., , 23., , 24,, , 25., , 26., , (a) Producing genetically different cells, , (b) Producing nuclei in ovules, , (c) Producing sperm cells, , (d) Repairing damaged tissues, , If you are provided with root-tips of onion,, class and are asked to count the chrome, which of the following stages can in, conveniently look into:, , (a) Prophase (b) Anaphase, , (c) Telophase (d) Metaphase, Which of the following cellular structures 4, disappears during mitosis and meiosis?, , (a) Plasma membrane, , (b) Nucleolus and nuclear envelope, , (0) Plastids, , (d) None of these, , Way, , . The stage in which daughter chromosomes Mo, , toward the poles of the spindle is:, , (a) Anaphase (b) Metaphase, , (c) Prophase (d) Telophase, , Which statement describes human cells forms, , by meiosis?, , (a) They are genetically identical and thy, become gametes., , (b) They are genetically identical and thy, become tissues., , (c) They are not genetically identical and thy, become gametes., , (d) They are not genetically identical and thy, become tissues., , Which of the events listed below is not obser, , during mitosis?, , (a) Chromatin condensation, , (b) Movement of centrioles to opposite poles, , (c) Appearance of chromosomes with, chromatids joined together at the centromet, , (d) Crossing over, , Identify the wrong statement about meiosis:, , (a) Pairing of homologous chromosomes., , (6) Four haploid cells are formed., , (c) At the end of meiosis the number, chromosomes are reduced to half., , (d) Two cycle of DNA replication occurs., , Select the correct statement about G1 phase:, , (a) Cell is metabolically inactive, , (b) DNA in the cell does not replicate rest, , (c) Itisnota phase of synthesis of macro™, , d) Cell sto) i, , (d) Ps growing ith eattl, , d, , . Which kind of cell division taking Pp!, , the following options is incorrect?, (a) At the tip of the root : Mitosis, , ad

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rd gi rth to the stem Mitosis, oa suce CBS Mitosis, jo Ping features are shown by the dividing, stage of mitosis: the nuclear membrane, < spindle fibres disappear; chromatids, ars) daughter nuclei are formed. Which, ne nt, discussed here?, vat, js bein (b) Metaphase, (d) Telophase, wo chromatids of a metaphase chromosome, iti, mo!, @ peplicated, hase, Non-homologous chromosomes joined at the, @ centromere, @ Maternal and paternal chromosomes joined, at the centromere, which of the following might you find in the, packbone of DNA?, 1 Phosphate group, 1, Hexose sugaT, 3. Adenine, @ 1 2and3 (b) lonly, (9 2only (d) 1and2, y. Which of the following bonds are broken during, DNA replication?, (a) Hydrogen bonds between bases., (t) Phosphodiester bonds., (9 Covalent bonds between bases., (@ Ionic bonds between bases and phosphate, groups., 2 Which of the following options, A — D, are the, pytimidine bases found in DNA?, (@) Uracil and Thymine, (b) Thymine and Cytosine, (9 Adenine and Thymine, (4) Cytosine and Uracil, , Match the following, , * Mate the events given in Column A with the, in mitotic cell division in Column B and, the correct opti, , ‘o fo, , Jogous chromosome of a diploid set, chromosomes to be separated at, , 2, , , , , ‘i, , | peesomes get arranged ina, (Dares plane at the equator., Et Bhter chromosomes move, indle, Opposite poles of a, , (A) Anaphase, , , , (B) Prophase, , ic), OB (C) Telophase, , sys et, mi —, 38 fine lon niga visible, . fae et, , Ke, , , , , , , , nln grins: Structure of Chromosomes, Call cycle and cell Division | 265, lien grains : Meiosis aie, rod uct re (D) Metaphase, , , , , , , , (iv) Chromosomes lose their, distinctiveness and gradually, become transformed into a, chromatin network., , Options:, , (a) (i) = (B), (ii) - (C) (iii) - (D), (iv) - (A), (b) (i) - (D), (ii) - (A) (iit) - (B), (iv) = (©), (c) (i) ~ (B), (ii) — (A) (iii) - (D), iv) = (C), (A) (i) = (D), (ii) = (A) (iii) - (C), (iv) - (BY, , , , , , , , Complete the following statements, , 34. The exchange of chromatid parts between the, maternal and the paternal chromatids of a pair, of a homologous chromosomes during meiosis is, , (a) Crossing over, (c) Meiosis, , (b) Karyokinesis, (d) Cytokinesis, , 35. A type of cell division by which gametes are, formed is ., (a) Mitosis (b) Meiosis, (c) Amitosis (d) Fission, , 36. The period of rest between two successive cell, divisions is 7, (a) Karyokinesis (b) Interphase, (c) Prophase (d) Dikaryophase, , 37. The type of cell division that leads to the formation, of two identical daughter cells is :, (a) Mitosis, , (b) Genetic recombination, , (c) Meiosis, , (d) Cytokinesis, , Lateral pairing of homologous chromosomes is, known as =, , (a) Recombination (b) Chiasmata, , (a) Cross over (d) Synapsis, , Network of long, thin, dark staining fibres seen in, the interphase nucleus is ‘, , (a) Synapsis, , (b) Chromatin fibres, , (c) Nucleosome, , (d) Nucleotide, , . Small constriction on the chromosome where, spindle fibres are attached, (a) Centrosome, , (b) Recombinant nodules, (c) Nucleotide, , (d) Nucleosome, Acomplex consisting of DNA strand and a core of, histones is <, (a) Nucleotide (b) Nucleosome, , (c) Centrosome (ad) Chromosome, , . Meiosis in diploid organisms results in, , ———————", , 38., , 39., , , , 41.

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CO, , 266 | Ics CHAPTERWISE McOs (BIOLOGY) - x, , (a) Production of gametes, , (b) Reduction in the number of chromosomes, (c) Introduction of variation, , (d) All of the above, , , , , , , , , , 43. Mitosis is characterised by, (a) Reduction division, (b) Equal division, (c) Both reduction and equal division, (d) Pairing of homologous chromosomes, , 44. Synthesis phase in the cell cycle is called so,, because of the synthesis of more :, , [ICSE 2017], , (a) RNA (b) RNA and proteins, (c) DNA (d) Glucose, , 45. Cells which are not dividing are likely to be at, (a) G ) G, (c) Go (d) S phase, , 46. A duplicated chromosome has, chromatids, (a) One (b) Two, (c) Three (d) Four, , 47. is not a stage of mitosis., (a) prophase (b) Interphase, (c) Metaphase (d) Anaphase, , 48. Meiosis the parental chromosome, number., (a) Doubles (b) Reduces, (c) Maintains (d) Stabilises, , 49. Chrosomes get aligned at the centre of the cell, during ., (a) Metaphase (b) Anaphase, (c) Prophase (d) Telophase, , 50. The cell component visible only during cell, division [ICSE 2013], (a) Mitochondria, (b) Chloroplast, (c) Chromosome, (d) Chromatin, , 51. DNA content doubles during, (a) Interphase, (b) Prophase, (c) Metaphase, (d) Growth phase, , 52. occupies the longest “period in a cell, cycle., (a) Interphase (b) Prophase, (c) Metaphase (d) Telophase, , 53. Centromere is concerned with., , , , (a) Duplication of DNA, , (b) Formation of spindle fibres, (©) Splitting of chromosomes, (d) Replication of DNA, , a, , 54. The nuclear membrane disappears a., during ——_——_ ley, (a) Early prophase, (b) Later prophase, (c) Metaphase, (d) Telophase, , 55. The chromosomes are most disting =, , a, (a) Prophase (b) Metaphase, (c) Anaphase (d) Telophase, , 56. In complementary base pairing of DNA,, always pairs with and adenine ava, pairs with . :, (a) Cytosine, uracil (b)_ Cytosine, thymin,, fer Hynes: eee A) Sat, , Name the Followin;, , 57. Chromosomes get aligned at the centre of the, , , , during : [ICSE 2p;, (a) Metaphase (b) Anaphase, (c) Prophase (d) Telophase., , 58. A pair of corresponding chromosomes of thesia, shape and size but one from each parent., (a) Autosomes, (b) Sex chromosomes, (c) Homologous chromosomes, (d) Analogous chromosomes, 59. The cell component visible only during &, , division:, (a) Chromosome (b) Chromoplast, (c) Chromatin (d) Centriole, , 60. The disappearance of spindle and uncoiling, chromosomes takes place in:, , (a) Anaphase (b) Telophase, (c) Pachytene (d) Meiosis, 61. The period between two successive mitt, divisions is:, (a) Diakinesis (b) Interphase, (c) Anaphase (d) Mitosis, 62. The chromatin material is formed of:, (a) DNAonly (b) DNA and Histon, , (c) Histones only (a) Nucleotides, , Explain the following terms, , 63. Chromosomes off, (a) Thread-like structure found in DNA that?, peers information of an organis™, form of genes. off, (b) Ring-like structure found in RNA tty, ace information of an org! 3, ‘orm of genes. iA, (c) Thread-like structure found in both ON; s, RNA that carry genetic informati, organism in the form of genes., , ad

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alike structure found in RNA that, genetic information of an organism in, , \B, @, i onorm of genes., , centrome! rt of nucl, ns? pa ! leus through which, (@) Sromosomes are linked., , it is @ part of chromosome through which, © romatids are linked., 7 4 k js a part of DNA through which chromatids, © ¢e linked., a Its apartof RNA through which chromosomes, ( are jinked., , ry, , 6. Mitosis a2., , (a) Aprocess of cell replication during which one, cell gives rise to two non-identical daughter, cells., , (b) A process of fission of cell during which one, cell gives rise to three genetically identical, daughter cells., , (9 A process of nuclear division during which, one cell gives rise to two genetically identical, daughter cells., , (4) A process of cell division during which one, cell gives rise to four genetically identical, , F daughter cells., 66. Meiosis, , (a) Aprocess where a single cell divides twice to, produce four cells containing half the original, amount of genetic information., , (b) A process where a nucleus divides twice to, produce four cells containing the original, amount of genetic information., , () A process where a cell divides thrice to, produce four cells containing half the original, amount of genetic information., , (d) A process where a DNA divides twice to, produce eight cells containing half the original, amount of genetic information., , 67. Gene, , (@) Physical and functional unit of heredity that, carries DNA material from one generation to, the next., , (b) Physical and functional unit of heredity that, carries chromosomes from one generation to, the next., , (©) Physical and functional unit of heredity that, carries gametes from one generation to the, next., , (@) Physical and functional unit of heredity, , that carries genetic information from one, Seneration to the next., , we the exact location of the following:, , ( le fibres, *) Between the two centrioles, , , , Se, , nn, , Structure of Chromosomes, Cell Cycle , and Cell owvision | 267, (b) Between the two centrosomes, (c) Between chromatid and centromere, (d) Between two centromeres, 69. Chromosomes, (a) In the cytoplasm of plant and animal cell., (b) In the centrosome of plant and animal cell., (c) In the RNA of plant and animal cell., (d) In the nucleus of plant and animal cell, 70. Cytoplasm., (a) Inside the cell between the nucleolus and the, centromere, (b) Inside the cell between the nucleus and the, cell membrane, (c) Inside the cell between the mitochondria and, the cell membrane., (d) Inside the cell near to the cell membrane, 71. Nucleus, (a) Centre of the cytoplasm, (b) Between the cell membrane and cytoplasm, (c) Equator of the cell, (d) Between nucleolus and cell membrane, 72. Ribosomes, (a) Scattered inside the cell, (b) Scattered inside the plasma membrane, (c) Scattered inside the nucleus, (d) Scattered in the cytoplasm, , State the function of the following:, , 73. Genes, (a) Help in carrying gametes, (b) Encode fats and lipids, (c) Encode particular protein, (d) Help in DNA replication, 74, Chromosomes, (a) The carriers of heredity, (b) The controlling centre of the cell, (c) The site for various chemical reactions, (d) Intracellular digestion., 75. Spindle Fibres, (a) Helps to divide the nucleus equally in the, daughter cells from the parent cell., (b) Helps to divide the cytoplasm in the daughter, cells from the parent cell., (c) Helps to divide the chromosome equally in, the daughter cells from the parent cell., (d) Helps to divide the centrosome equally in the, daughter cells from the parent cell., 76. DNA, (a) Controls functioning of RNA, (b) Controls biosynthetic processes of cell., (c) Stores all of the genetic information, (d) Controls mitotic and meiotic division., 77. Golgi Apparatus, (a) Synthesis of respiratory enzymes