the purpose of the of pollen tube is to fuse or join with the ovules to cause fertilization.
The purpose of cross-pollination and self-pollination are to perform reproduction so off spring can be produced.
A pollination tube, or pollen tube, is a thin tube that is a part of the male gametophype. It is found in seed plants and works by acting as a sort of conduit to transport gamete cells.
Pollination brings together the gametes of a flower and it occurs when a pollen grain of the right kind lands on the stigma of the pistil. Each pollen forms a tube that grows down through the pistil and reaches the ovule in the ovary. One of the nuclei in the pollen tube unites with the egg nucleus in the ovule to form a zygote. The other sperm nucleus combines with another bigger nucleus in the ovule which develops into the endosperm.
pollination helps
Before
Pollination
The pollen tube grows down to the style after the pollination happen.
to attract insects and animals for pollination
to attract bees for pollination
Pollen grains and on stigma of a compatible plant; the pollen grains germinate and grow down the style and into the ovary. Once in the ovary a sperm nucleus from the pollen grain fuses with the ovule (and forms into a zygote or embryo). The pollen tube then degenrates and the ovule forms into a seed.
Most pollination takes place with the help of insects and wind. The purpose of pollination is to transmit the pollen from one plant to the stigma of another plant.
To attract bees, moths and other insects to achieve pollination