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¢)Multiple Choice Questions (MCQs), , (A) NAME THE FOLLOWING BY CHOOSING THE CORRECT OPTION:, , , , Q.1. The most clearly visible events occurring during cell divisions are all related to, , (a) Genes (b) Chromosomes, ‘() DNA : (¢) RNA, - Q.2, The phase in which nucleolus reappears, (a) Prophase (6) Metaphase, (c) Anaphase (d) Telophase, . Q.3. The chromatin material is formed of, i (a) DNA only (b) DNA and Histones, { (c) Histones only (d) Nucleotides, , Q.4. Scientist who first studied chromosomes in animal cell !, ; (2) Walther Flemming ®) Hofmeister 5, { () Waldeyer (@) Frederick Miesher, j Q5. A structure that disappears during late prophase, ; (a) Nucleus () Cell membrane, t (c) Nucleolus (d) Nuclear membrane, _ Q.6. The nitrogenous base which is not present in DNA, : (a) Adenine (6) Guanine, i (c) Cytosine (d) Uracil, , Q.7. Which of the following animals have 19 pairs of chromosomes?, x (a) Lion (b) Cat, } (0) Tiger (d) Allof these, 2 Q.8. Synthesis phase of the interphase of cell cycle, is called so for the synthesis of more of, (a) Glucose () DNA, (c) RNA : (d) RNA and Proteins, q, , ~

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Q.9. Mitosis is characterized by, (a) Reduction division (b) Crossing over, (c) Pairing of homologous chromosomes _(d) None of these, Q.10. The shape of DNA molecule was first studied by, , , , , , , , , , , , , bie (a) Rosalind Franklin (8) Watson and Crick, j (c) Mendel (d) Darwin, (8) COMPLETE THE FOLLOWING STATEMENTS BY CHOOSING THE APPROPRIATE ornion|, FOR EACH BLANK: <All, Q.11. New cells need to be produced for, (2) Replacement (b) Reproduction, (c) Repair (d) All of these, Q.12 Cure for some cancers can be achieved in the Phase of the cell cycle., (2) S phase (b) G, phase, | (0) Gy phase (@) All of these, Q.13. During G, phase, a diploid cell contains the amount of DNA equal toa, (2) Diploid cell (b) Tetraploid cell, (c) Haploid cell (d) None of the above, Q14, , A cell that has 36 chromosomes, at the start of interphase will have, (2) 18 singular chromosomes, , (b) 36 singular chromosomes, (c) 18 replicated chromosomes, , , , at the conclusion of meiosis:, ;, , (d) 9 chromosomes, one in each of the four gametes produced, Q.15. The cell size doubles ina stage of cell called, , @M 4 OG, @s @G,, , ap Q.16. In human males, all the chromosomes ar., | chromosomes is / are, , e paired perfectly except one. This / these unpaired, , , , (i) large chromosome (ii) small chromosome (iii) Y-chromosome (i2) X-chromosome, , , , , , i (a) (f) and (i) () (i only si, t (9) (iii) and (im) (@) (ii) and (iz), Q.17. Cell plate grows from, (a) walls to the centre (6) centre to the walls, (c) in patches (4) simultaneously, Q.18. The number’ of chromosomes Present in onion root tip cell is eo,, (2) 06 ; (16, , (c) 26 (4) 36

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Q.19., , Q.20., , Duplicated chromosomes are joined at a point termed as, (a) Centrosome (b) Centromere, (c) Centriole (d) Chromatid, , The chromosomes which determines the sex of an individual in sexually reproducing organisms are, called, , , , (a) Autosomes (6) Allosomes, , (c) Homogametic (d) Heterogametic, , (C) CHOOSE THE CORRECT ANSWER FROM EACH OF THE FOUR OPTIONS GIVEN BELOW:, , , , Q.21., , Q.22., , Q.23., , Q.24., , Q.25., , Q.26,, , Q.27., , Q.28,, , Q.29,, , , , How many chromatids are there in a duplicated chromosome?, , (2) One (b) Two, , (c) Three (d) Four, , How many chromatids does a diploid body cell contain just prior to cell division?, (a) 23 (6) 46, , (c) 69 (4) 92 ¢, , The phase of the cell cycle in which the cells which no longer divide (such as certain specialized cells, found in the human brain) remain in, , (a) Prophase (b) S Phase, , (c) Gp Phase (d) G, Phase, , The phase of mitosis which is associated with the formation of the nuclear membrane is, (a) prophase (b) metaphase, , (c) anaphase (d) telophase, , Which of the following is not a part of a human chromosome in any phase?, (a) Centriole (b) Histone, , (c) Nucleosome (d) Centromere, , The term, not related to mitosis is, , (a) gametes (b) chromosomes, , (c) DNA replication (d) somatic cells, , The structure that forms a network of protein cables during cell division is, (a) Spindle (b) Aster, , (c) Kinetochore (d) Chromatid, , The event which does not occur during interphase is, , (a) Chromatin condenses (b) Protein synthesis, , (c) Replication of DNA (d) None of these, , Ina human male, a sperm will contain:, , (a) Both X and Y chromosomes (® Only X chromosome, , (c) Only Y chromosome (d) Either X or Y chromosome

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Q.30. The term ‘chromosomes’ literally means ae, (a) Inherited bodies (b) Twisted threads 5, (c) Coloured bodies (d) Shining threads pis, (D) EXPLAIN THE FOLLOWING TERMS:, Q31. Chromosomes, , (2) These are highly coiled and condensed chromatin fibres., (®) These are small but thin darkly stainable structures., , , , , , (c) These are structures that contain on long RNA molecule associated with many proteins., (@) These are uncoiled, darkly stainable structures, that can readily pick up certain dyes to get colo’ ure, Q32 Cell cycle y, (2) Aseries of events that take place ina cell leading to duplication of its DNA and subsequent divisir, of cell to produce three daughter cells. fe, (b) A series of events that take place ina cell leading to duplication of its RNA and subsequent divisir, of cell to produce two daughter cells. t, (c) Aseries of events that take place in a cell leading to duplication of its DNA and subsequent divisic, of cell to produce two daughter cells. me:, , (@) A series of events that take place in a cell leading to duplication of its nucleus and subseque, division of cell to produce four daughter cells., , Q33. Karyokinesis, (2) The division of cytoplasm is termed as karyokinesis., () The division of cytoplasm cell is termed as karyokinesis., (c) All the cytoplasmic changes that occur during cell division are collectively termed as karyokinesi, (@) All the nuclear changes that occur during cell division are collectively termed as karyokinesis., Q3L Mitosis, (2) Cell division leading to the production of haploid cells for growth and development., (®) Cell division leading to the production of diploid cells for growth and development., (c) Cell division leading to the production of germ cells for reproduction., (2) Cell division leading to the production of abnormal cells for growth and development., Q35. Homologous chromosomes, (2) The chromosomes which are exactly same in size and shape bearing same gene at same loci., (b) The chromosomes which are exactly same in size and shape bearing same gene at different loci, , (c) The chromosomes which are not exactly same in size and shape and does not bear same genez, same loci., , (@) The chromosomes which are thick and condensed having same gene at same loci., , (E) STATE THE EXACT LOCATION OF THE FOLLOWING:, Q.36. Spindle fibres, (2) Between two centrioles (b) Between two centrosomes, , (c) Between chromatid and centromere (d) Between two centromeres, Q.37. Kinetochore, , (a) Above the nucleus (b) Between two chromatids, (0) Inside chromatin fibres (4) Inside nucleolus

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Q.38. Cell plate, (a) In cytoplasm at the equatorial plane _(b) Inside nucleus in its centre, , (c) Between two centrioles (d) Between spindle fibres, Q.39. DNA strands, (a) In the nuclear membrane (B) In the mitochondria, (c) In the chromosomes (d) In the chloroplast, Q.40. Double Hydrogen bond, (a) Between Adenine and thymine (b) Between Adenine and guanine, (c) Between Cytosine and thymine (d) Between Adenine and Cytosine, , ‘F) STATE THE FUNCTION OF THE FOLLOWING :, Q.41. Histone proteins, , (a) Coiling and packaging of DNA (b) Protein synthesis, (c) Synthesis of DNA (d) None of these, Q.42. Genes, (a) Starts cell division (0) Transmission of characters from parents to offsprings, (c) Attaches two chromatids (@ Growth and regeneration, , ‘'G) DIAGRAM BASED QUESTIONS :, , Q.43, The diagram alongside shows a component of DNA., (i) Identify the structure., (a) Nucleosome (®) Nucleotide (A), (c) Chromonema (@) Chromatin A (ey c, (ii) Label the parts marked A, B & C., A. 1, Sugar 2. Hydrogen bond 3. Phosphate 4. Base, B. 1. Sugar 2. Hydrogen bond 3. Phosphate 4. Base, C. 1. Sugar 2. Hydrogen bond 3. Phosphate 4. Base, (iit) Adenine of DNA pairs with _____ having two hydrogen bonds between them., (a) Thymine (b) Cytosine (c) Guanine (@ Uracil, Q.44. The diagram represents a stage during mitotic cell division in an animal cell., (i) Identify the stage., , , , , , , , , , , , , , , , (a) Prophase (6) Metaphase, , (c) Anaphase (d) Telophase ‘, (i) What is the chromosome number of this cell?, , (a2 (3, , (4 (os, (ii) What stage comes just after the stage shown in the diagram?, , (a) Prophase (b) Metaphse, , (©) Anaphase (@) Telophase