Question

Процесс переноса пыльцевых зерен с пыльника тычинки на рыльце пестика

Answer 1

Опыление - перенос пыльцы с цветка на цветок.

Answer 2

Опыление-перенос пыльцы со цветка на цветок

Answer 3

Process of Transferring Pollen Grains from the Anther to the Stigma

The process of transferring pollen grains from the anther to the stigma is known as pollination. This is an essential step in the reproduction of flowering plants. Let's explore the process in detail:

1. Pollination Types: - There are two main types of pollination: self-pollination and cross-pollination. - Self-pollination occurs when pollen grains from the anther of a flower are transferred to the stigma of the same flower or another flower on the same plant. - Cross-pollination occurs when pollen grains are transferred from the anther of one flower to the stigma of a different flower, either on the same plant or a different plant.

2. Mechanisms of Pollen Transfer: - Pollen transfer can occur through various mechanisms, including wind, water, and animals. - Wind pollination is common in plants that produce large amounts of lightweight, dry pollen. The pollen is released into the air and carried by the wind to nearby flowers. - Water pollination occurs in aquatic plants, where the pollen is released into the water and carried to the female reproductive structures. - Animal pollination is the most common form of pollination and involves the transfer of pollen by animals such as insects, birds, bats, and other small mammals. This type of pollination is often more efficient and targeted than wind or water pollination.

3. Transfer of Pollen from Anther to Stigma: - In animal-pollinated plants, the transfer of pollen from the anther to the stigma is facilitated by various adaptations. - When an animal visits a flower, it may come into contact with the anther, which holds the pollen grains. The pollen may stick to the animal's body, such as its fur, feathers, or body parts. - As the animal moves from flower to flower, some of the pollen grains may be transferred to the stigma of the flowers it visits. - In wind-pollinated plants, the pollen is released into the air and carried by the wind. Some of the pollen grains may land on the stigma of nearby flowers.

4. Pollen Tube Formation and Fertilization: - Once the pollen grains land on the stigma, they may germinate and form a pollen tube. - The pollen tube grows down through the style, a long tube-like structure that connects the stigma to the ovary. - The pollen tube delivers the male gametes (sperm cells) to the ovary, where fertilization takes place. - Fertilization results in the formation of seeds, which eventually develop into fruits.

It's important to note that the process of pollination can vary among different plant species and depends on various factors such as the plant's reproductive structures, the type of pollinator involved, and environmental conditions.