because they do not need them for one reson they dont swim
[Another explanation]
Plants use other methods to transport mature pollen grains to cross-pollinate other flowers or self-pollenate. Because plants can't move about freely like animals do, plants utilize the wind and insects to help carry mature pollen grains to other flowers. Plants exploit the needs of insects such as bees providing nectar in order that in the process attach pollen grains to bees, whom will carry it on to the next flower they come in contact with.
Because it is where the embryo of a seed plant develops. I hope my answer can help you. =)
Since , in the seed bearing plants the gametophyte is reduced that is why they have spread far and wide.
Embryo sac is the female gametophyte of flowering plants. Situated in the flower. It is dependent on the sporophyte (what we call plant) for nutrition. here the gametophyte is reduced and sporophyte is dominant.In lower plants the female gametophyte is prominent and independent where it can photosynthesize. Usually it is called as a thallus. Here the sporophyte is reduced and the gametophyte is dominant.
Flowering seed plants are gymnosperms and angiosperms
angiosperms are flowering plants.
During pollination, the sperm of the male gametophyte are not flagellated because they generally do not move. They rely on the growth of a pollen tube to deliver them to the egg cell.
In flowering plants, megaspores become the female gametophytes.
In flowering plants, the megaspore becomes the female gametophyte. It is the larger meiospore produced in heterosporous plants, and is the embryonic sac of a flower.
In flowering plants, megaspores become the female gametophytes.
it is pollen
It has got a dependent gametophyte on main sporophytic plant body and embryo develops inside the embryo sac in all flowering angiospermic plants.
Because it is where the embryo of a seed plant develops. I hope my answer can help you. =)
You get both flowering plants and non-flowering plants; non-flowering are things like mosses, ferns and liverworts which produce spore, flowering plants produce seeds
There are two types of flowering plants. These two types of flowering plants are the perennials and the annual flowering plants.
Since , in the seed bearing plants the gametophyte is reduced that is why they have spread far and wide.
Embryo sac is the female gametophyte of flowering plants. Situated in the flower. It is dependent on the sporophyte (what we call plant) for nutrition. here the gametophyte is reduced and sporophyte is dominant.In lower plants the female gametophyte is prominent and independent where it can photosynthesize. Usually it is called as a thallus. Here the sporophyte is reduced and the gametophyte is dominant.
Flowering plants require pollinatio non-flowering plants do not.