Page 26 - Biology - XII
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Q8.  What happens in metaphase stage?
          Ans.  The chromosomes are arranged at equator of the cell.

           Q9.  How can you diff erentiate between slides of plant cell division and animal cell division?
          Ans.  By the shape of cells. Plant cells are rectangular and animal cells are oval/round.
          Q10.  What are the phases of cell division?
          Ans.  Prophase, Metaphase, Anaphase, and Telophase
          Q11.  At which stage, the chromosomes are separated and pulled to opposite poles?
          Ans.  Anaphase

          Q12.  Chromosomes are visible in which stage of cell division?
          Ans.  All stages except interphase.
          Q13.  How does the parent plant cell divide into two daughter cells?
          Ans.  A parent plant cell divides into two daughter cells by cell plate formation.
          Q14.  What is cell furrow?
          Ans.  The constriction of a dividing animal cell at telophase stage for cytokinesis is called cell furrow.

          Q15.  Why did you warm the root tip cells with the acetocarmine stains?
          Ans.  For killing the cells and penetration of stain in it.
          Q16.  What is the number of daughter cells formed after mitosis cell division?
          Ans.  Two
          Q17.  How does the cytoplasm divide in the dividing cell?
          Ans.  By simple division called cytokinesis.

          Q18.  How does the cell divide into two in telophase?
          Ans.  By cell plate formation in plant cell.

          Q19.  How can you identify the anaphase stage?
          Ans.  The chromosomes are pulled towards opposite poles and their arms are towards the equator of cell.
          Q20.  At which stage, the daughter nuclei are formed?
          Ans.  Early telophase



                                           COMPETENCY BASED QUESTIONS


          Assertion-Reason Type Questions

          These consist of two statements—Assertion (A) and Reason (R). Answer these questions by selecting
          the appropriate option given below:
             a.  Both A and R are true and R is the correct explanation of A.
              b.  Both A and R are true, but R is not the correct explanation of A.

             c.  A is true, but R is false.                       d.  A is false, but R is true.
              1.  Assertion (A) :  Gametes receive only one allele of a gene.
                 Reason (R)     :  During gamete formation, mitosis leads to formation of haploid cells.

            Answer Key
                  1. (c)



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