61.  By which medium gametes of Algae, Bryophytes and Pteridophytes move ?

62.  Which structure provides surface for the settlement of pollen grains in angiosperm plants ?

63.  The process of transfer of pollen grains from the anther to the stigma is known as ...... .

64.  Where do pollen grains germinate ?

65.  Which structare is produced by germination of pollen grain ?

66.  In which organ the growth of pollen tube is observed, till it reaches the ovules ?

67.  Devlopment of zygote result in formation of...............

68.  During conjugation, the-bridge is formed of........... .

69.  The process oforgan formation start of................ .

70.  The fertilized eggs of reptile and birds are covered with calcareous shell. Due to this the zygote passes from which phase ?