Grasses, cereals, date palms, tulips, daffodils and lilies are all monocotyledons. Many other flowers, together with trees, vegetables and fruits, are dicotyledons. Each of these two kinds of plant develops in its own way. In mono-cotyledons, however, the flower parts tend to be set in threes. Pollination For a seed to develop, pollen from the male anther has to get to the female stigma.
Some flowers are self-pollinating.
This means the pollen moves from the anther to the stigma on the same plant. Others are cross-pollinating. This means the pollen from the anther must be carried to the stigma of a different plant of the same kind. Sometimes the wind will carry the pollen. Sometimes it is carried by insects such as bees, or even by birds or bats.