The reproduction of plants happens, almost always, through the flower.
The reproduction of almost all plants happens through the flower, which has, inside, the female organ called gynecium and the male organ called androceu.
The androceu is composed of stamens, which support the bag where pollen grains are found. In the pollen grains there are the sex cells of the plant.
Gynecium is composed of the ovary, which produces and stores eggs. In the eggs there are also the sex cells of the plant.
When the pollen grains reach the gynecium and reach the egg, fertilization occurs. The ovary will develop and turn into fruit, while the egg will turn into seeds. Thus, the flower will wither.
Animals that help pollinate flowers
Plants need help so that the pollen grain that remains in the androceu reaches gynecium. One of the forms of help that nature offers are insects. They manage to take pollen grains from one flower to another, and what we call pollination occurs. Hummingbirds, wind and water also help flowers in pollination.
In addition, animals also help to spread the seeds of the plants. When feeding on fruits, animals can drop some seed in the soil. If there are adequate conditions for germination, a new plant will be born.
Some plants have developed structures that help to spread their seeds. This is the case with dandelion and tick fruits.