Question

Помогите с докладом по биологии тема(плоды.цветы.опылении)!Очень нужно плиз

Answer 1

После того как цветок отцвёл, наступает новый этап его развития - образование плода. Важнейшие функции плода - защита и распространение семян   
Процесс переноса пыльцы с тычинок на рыльце пестика называют опылением

Answer 2

Introduction

Sure, I'd be happy to help you with your biology presentation on the topic of fruits, flowers, and pollination. These are fascinating subjects that play a crucial role in the life cycle of plants. Let's dive into the details!

Fruits

Fruits are the mature ovaries of flowering plants. They develop from the fertilized ovules after pollination and contain seeds. Fruits serve several important functions in plants, including seed dispersal and protection. They come in a wide variety of shapes, sizes, and colors, and can be classified into different types based on their characteristics.

Some common types of fruits include:

1. Simple Fruits: These fruits develop from a single ovary of a single flower. Examples include apples, oranges, and cherries.

2. Aggregate Fruits: These fruits develop from multiple ovaries of a single flower. Each ovary forms a separate unit within the fruit. Examples include raspberries and blackberries.

3. Multiple Fruits: These fruits develop from the ovaries of multiple flowers that are closely clustered together. Examples include pineapples and figs.

4. Accessory Fruits: These fruits develop from the ovary as well as other floral parts. Examples include apples and strawberries, where the fleshy part is derived from the receptacle.

Flowers

Flowers are the reproductive structures of flowering plants. They contain male and female reproductive organs, namely the stamens and the pistil. Flowers are responsible for the production of seeds through the process of pollination and fertilization.

The structure of a flower typically consists of the following parts:

1. Sepals: These are the outermost parts of the flower that protect the developing bud.

2. Petals: These are the colorful and often fragrant parts of the flower that attract pollinators.

3. Stamens: These are the male reproductive organs of the flower. Each stamen consists of a filament and an anther, which produces pollen grains.

4. Pistil: This is the female reproductive organ of the flower. It consists of three main parts: the stigma, the style, and the ovary. The stigma receives pollen, the style connects the stigma to the ovary, and the ovary contains the ovules.

Pollination

Pollination is the transfer of pollen from the anther of a flower to the stigma of the same or a different flower. It is a crucial step in the reproduction of flowering plants. Pollination can occur through various mechanisms, including wind, water, and animals.

1. Wind Pollination: In wind-pollinated plants, such as grasses and many trees, pollen is light and produced in large quantities. It is carried by the wind to reach the female flowers.

2. Insect Pollination: Many flowers have evolved to attract insects, such as bees, butterflies, and beetles, for pollination. These flowers often have bright colors, strong fragrances, and nectar as rewards for the pollinators.

3. Bird and Bat Pollination: Some flowers have evolved to attract birds and bats for pollination. These flowers are usually large, brightly colored, and produce copious amounts of nectar.

4. Water Pollination: In aquatic plants, such as water lilies, pollination occurs through water. The pollen is released into the water and carried to the female flowers.

Conclusion

In conclusion, fruits, flowers, and pollination are interconnected aspects of plant biology. Fruits are the mature ovaries of flowering plants and serve important functions in seed dispersal and protection. Flowers are the reproductive structures of plants, containing male and female reproductive organs. Pollination is the transfer of pollen from the anther to the stigma and can occur through various mechanisms. Understanding these concepts is crucial for comprehending the life cycle and reproduction of plants.

I hope this information helps you with your biology presentation! If you have any more specific questions or need further assistance, feel free to ask.