BIOLOGY Chapter 21, 23

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                         BIOLOGY                   Ch. 21, 23
1)       The process o mitosis ensures  
         a)       Change in nature of genes          
         b)       A reduction in the number of chromosomes  
         c)       An increase in the size of cells
         d)       Same number of chromosomes in daughter cells  
2)       What is the importance of the fact that meiosis occurs during the formation
         of gametes  
         a)       It allows the no. of sex cells to become half
         b)       It prevents variation appearing the phenotype  
         c)       It produces haploid sex cells in preparation of fertilization  
         d)       It prevents asexual reproduction  
3)       In  which  of  the  following,  daughter  nuclei  contain  only  one  chromosome
         from each original pair of the chromosomes  
         a)       mitosis but not meiosis                      b)      meiosis but not mitosis  
         c)       both mitosis and meiosis                     d)       neither mitosis and meiosis  
4)       Mitotic apparatus of a plant cell consists of  
         a)       spindle fibers                               b)       centrioles  
         c)       aster                                        d)       all of these  
5)       Mitosis takes place during  
         a)       healing of wound                             b)       development and growth  
         c)       vegetative propagation                       d)       all of these  
6)       The sex chromosomes of persons subjected to klinefelters syndrome are  
         a)       xxy                                          b)       xyy              
         c)       both of these                                d)       none of these  
7)       Down’s syndrome in human beings is due to  
         a)       An extra sex chromosome                      b)       An extra X-chromosome  
         c)       An extra Y-chromosome                        d)       An extra autosome  
8)       Which of the following category comes under Turners Syndrome  
         a)       A male having two X-chromosome  
         b)       A female having three X-chromosome  
         c)       A male having only one Y-chromosome  
         d)       A female having only one X-chromosome  
9)       Failure  of  the  chromosomes  to  separate  from  each  other  during  meiosis  is
         called  
         a)       Disjunction                                  b)       Crossing over  
         c)       Non-disjunction                              d)       Segregation  
10)      Morphology of chromosome is best studied during  
         a)       Telophase                                    b)       metaphase  
         c)       prophase                                     d)       all  
11)      Spindle fibers are formed by special type of proteins called  
         a)       histone           b)       tubulin           c)       transein         d)       fibrin  
12)      Synapsis occurs during  
         a)       zygotene          b)       pachytene         c)       diplotene        d)   diakinesis  
13)      A bivalent consists of  
         a)       two chromatids                               b)       four chromatids  
         c)       one homologous chromosome                    d)       a typical chromosome  
14)      In meiotic I, nuclear membrane disappears in  
         a)       prophase I        b)       metaphase I       c)       anaphase I       d) telophase I
15)      Which of the following is not related to meiosis  
         a)       involve in sexual reproduction  
         b)       variation are produced  
         c)       maintains chromosome number constant from generation to generation  
         d)       homologous pairs of chromosomes are attached to each other