AP BIOLOGY

Detailed explanation-1: -gametophytes are of two type viz. male gametophyte and female gametophyte male gametophyte produces flagellated sperms these sperms require water to move to the female gametophyte and fertilise the eggs hence water is essential for the life cycle of bryophyte In addition water is also needed for photosynthesis as well.

Detailed explanation-2: -Bryophytes also need a moist environment to reproduce. Their flagellated sperm must swim through water to reach the egg. So mosses and liverworts are restricted to moist habitats.

Detailed explanation-3: -Bryophytes have neither pollen nor flowers and rely on water to carry the male gametes (the sperm) to the female gametes (the eggs). The spore capsules are produced after the sperm have fertilized the eggs.

Detailed explanation-4: -Bryophytes are dependent on water for survival and reproduction. Water is necessary for sexual reproduction in Bryophytes as sperms swim to the eggs to fertilize it.

Detailed explanation-5: -The completion of the bryophyte and pterophyte life cycle requires water because the male gametophyte releases sperm, which must swim-propelled by their flagella-to reach and fertilize the female gamete or egg.