The flower is the means by which the plant can reproduce new plants like itself. A botanist defines a flower as a group of parts whose function is to produce pollen or seeds or both. The most important parts of the flower, from this point of view, are“pistils” and “stamens”. Many flowers contain both, the pistil or pistils in the center, surrounded by the stamens.
In the enlarged, bottom part of the pistil there are tiny bodies called “ovules”. Each ovule may develop into a seed. The most impor- tant part of an ovule is a tiny egg cell, so small it can only be seen under a microscope.
The stamens contain a pollen sac at the end of a stalk. When these pollen sacs open, they release the pollen they contain as a fine dust which is usually yellow.
In order to produce new seeds, the pollen grains from the stamens must be transferred to the pistils. This transfer of pollen is always called “pollination”. Pollination is brought about in many different ways. Sometimes the pollen simply falls onto the pistil, but usually, the wind or insects are needed for pollination.
Among the plants that are pollinated by the wind are the grasses; not just the grasses of the meadows, but wheat, corn, and other grains. The stamens wave in the breeze. The pollen is shaken off and flies through the and lands on pistils.
Another form of pollination is carried out by insects. This usually happens with flowers that have bright colors or fragrance, and thus attract insects. Insects visit the flower for nectar which they make into honey, and for pollen which they use as food. As an insect collects pollen from a flower, some of it rubs off on the insect’s body. Then, when the insect visits another Bower, some of the pollen rubs on to the stamens.
What Are 2 Types Of Pollination?
Pollination takes two forms: self-pollination and cross-pollination. Self-pollination occurs when the pollen from the anther is deposited on the stigma of the same flower, or another flower on the same plant.