Knowledge Point 01: TheStamen is Composed of Anther and Filament, While the Pistil Consists of Stigma, Style, and Ovary
The stamen, serving as the male reproductive organ, has an anther at its upper part, which contains pollen, and a filament at its lower part, providing support.
The pistil, on the other hand, comprises three parts: stigma, style, and ovary. The stigma has viscosity and can adhere to pollen. The style serves as a passage for pollen to reach the ovary, while the ovary nurtures the ovule.
The intricate structure of the stamen and pistil ensures the smooth progress of plant sexual reproduction. When the anther matures, it dehisces and releases pollen, which is then dispersed to the stigma of the pistil by wind, water, insects, or other media.
The tissues within the style guide the pollen tube to grow downward to the ovary, allowing the sperm to fertilize the ovule, completing the fertilization process. This process is crucial for plant reproduction.
Knowledge Point 02: The Flower Contains Stamens and Pistils, with Pollen Produced by Stamens Being Transferred to the Stigma of Pistils to Cause Fertilization
The flower’s core part is the flower reproductive organs, which are divided into stamens and pistils. Stamens are responsible for producing pollen, while pistils are responsible for receiving it.
When pollen successfully reaches the stigma of the pistil and undergoes a series of complex physiological processes, it ultimately leads to the fertilization of the ovule within the ovary.
Fertilization is a vital stage in the plant reproductive cycle. Once the ovule is fertilized, the ovary begins to develop into a fruit, enclosing the seed developed from the fertilized ovule. This process not only ensures the continuation of plant populations but also provides the foundation for the birth of new life.
Knowledge Point 03: Flowers Like Rapeseed That Rely on Insects Such as Bees for Pollen Dissemination Are Called Insect-Pollinated Flowers
Plants with vibrant colors and fragrant scents, such as rapeseed, rely on insects like bees for pollen dissemination. These flowers are referred to as insect-pollinated flowers. Insects make contact with anthers and stigmas during their visits to flowers, enabling pollen transfer.
Insect-pollinated flowers attract insects by providing nectar, pollen, and other food resources. During their visits, insects not only assist in plant reproduction by disseminating pollen but also obtain abundant food for themselves. This mutually beneficial relationship exists widely in nature and is significant for maintaining ecological balance.
