question_answer 31)

  In Spirogyra, asexual reproduction takes place by (a) breaking up of filaments into smaller bits       (b) division of a cell into two cells (c) division of a cell into many cells                           (d) formation of young cells from older cells

Answer:

                  (a) In Spirogyra, asexual reproduction takes place by fragmentation, i.e., organism simply breaks up into smaller pieces upon maturation. Each pieces grow into new individuals without forming any gametes.