Would a defoliated plant respond to photoperiodic cycle? Why?

According to Mendel's experiment, the tall plants in F_(1) generation were exactly the same as the tall plants of the parent generation ? Why ?

In bryophytes, the dominant phase in the life cycle is the ____ plant body but in pteridophytes, the main plant body is_____.

Will geographical isolation be a major factor in the speciation of a self-pollinating plant species ? Why or why not ?