What are the stages of the life course of animals and plants?

Animal life cycle.

They all have to go through four stages: birth, growth and development, reproduction, and death.

The four phases are as follows:

1. Birth: Generally refers to the generation of all life. Human beings are born vertically, which distinguishes them from animals that are born horizontally (animals).

2. Growth and development: refers to the growth and morphological changes of various organs and systems of the body, which is a change in quantity; Development refers to the differentiation and improvement of cells, tissues and organs, the maturation of functions, and the change of plasm production. The two are closely related, and growth is the material basis of development.

The maturation status is reflected in the change in the amount of growth.

3. Reproduction: gradually increase or increase the number of organisms; The process of birth, connection, and continuation of a certain life and its living system. It is the behavior of life to give birth to offspring, which can be divided into sexual reproduction and asexual reproduction.

4. Death: that is, the disappearance of a life.

The evolution of plants is roughly as follows: the primitive algae that live in the ocean gradually evolve into adaptation over an extremely long period of time.

The primitive bryophytes and ferns that lived on land made the original barren land begin to be covered in green. Later, some primitive ferns evolved into primitive seed plants, including primitive gymnosperms and angiosperms, and their reproduction was completely free from the constraints of water and more adapted to life on land.

There are five important processes in the growth cycle of a plant:

1. Seed germination stage: healthy seeds germinate and grow into seedlings under suitable temperature, water and light conditions.

2. Seedling growth period: branches and leaves grow rapidly, and nutrients are produced to form robust plants.

3. Strong seedling development period: the branches and leaves grow slowly, and the plant begins to form flower buds.

4. Seedling flowering stage: all the energy of the plant is concentrated in flowering, showing a state of luxuriant flowers.

5. Seed formation period: the flower develops to form a fruit containing seeds, and the seeds mature until senescence.

The primitive single-celled organisms will gradually become the most primitive algae plants, and as the original single cell will gradually evolve into multicellular. The algae in the water gradually evolved to the land, turning into a lower moss. With the movement of the earth's crust, the plants in the sea gradually evolved into ferns.

After that, ferns will gradually evolve into gymnosperms, and then the highest plants will appear, that is, angiosperms.

Algae. In the earliest period of Haojijian, the primitive single-celled organisms will gradually become the most primitive Yuhe algae plants, such as green algae, cyanobacteria, etc., which originated in water and are very dependent on water, and their growth is also inseparable from water. As it evolves, the original single cell will gradually evolve into a multicellular, and the structure of the front cherry will gradually become more numerous and more complex.

Moss. The algae in the water gradually evolved to the land, turning into lower mosses, such as lichens, which are very adaptable to the environment.

Fern. As the earth's crust progressed, some of the oceans would become land, and the plants in the sea would gradually evolve into ferns. At first, it was only an evolved nudibranch, with no leaves or roots, and only lived on land on false roots.

Later, it will evolve into stems, roots and leaves, but it is still inseparable from water for reproduction.

Gymnosperm. Later, due to climate changes and the movement of the earth's crust, a large number of ferns will disappear, and the previous ferns will gradually evolve into gymnosperms, which can completely escape the influence of water and adapt to the growth on land.

Algae, mosses, ferns, angiosperms, keeps. The most primitive and simple plant is algae. Algae were originally unicellular, such as Yiyu or ruined algae, and then evolved into multicellular algae, such as cotton, kelp, seaweed, etc., which are all multicellular algae.

They also differentiate between marine algae and freshwater algae.

Zygote-embryo-seedling-mature plant The last decay period (cessation stage).

From sowing, it goes through the whole stage of seedling, maturity, flowering, senescence, and withering, and the growth cycle of plants is also a cyclical process.

2. Growth stage:

The life of a plant will go through the seedling stage, the growth period, the flowering period, the fruiting period, and the withering stage.

1. Seedling stage:

The seeds germinate at the right temperature and moisture and grow into seedlings, and this period is known as the seedling stage. In the seedling stage, the seed mainly grows its root parts and leaves.

2. Growth period:

After the seedling stage, the plant will grow rapidly under the right temperature, and this period is the growth period, and the stalks, roots and leaves of the plant will develop rapidly.

3. Flowering period:

After the plant has grown, it is the flowering period, and when it blooms, the bees surround the butterfly array, and they arrive to make an important contribution to the plant's fruiting.

4. Fruiting period:

After flowering, with the help of bees and butterflies, the plant is fertilized and small fruits are produced on the treetops.

5. Withering period:

In autumn, when the fruit is ripe and the leaves wither due to the weather, the plants reach the withering stage.

Plants are one of the main forms of life, including trees, shrubs, vines, grasses, ferns, and familiar organisms such as green algae and lichens. It is estimated that about 350,000 species of seed plants, bryophytes, ferns and ferns exist. Most of the energy of green plants is obtained from sunlight through photosynthesis, and temperature, humidity, light, and fresh water are the basic needs of plants for survival.

Seed plants have six major organs: roots, stems, leaves, flowers, fruits, and seeds. Green plants have the ability to photosynthesize - with the help of light energy and chlorophyll, under the catalytic operation of enzymes, water, inorganic salts and carbon dioxide are used for photosynthesis, releasing oxygen, absorbing carbon dioxide, and producing organic matter such as glucose for plant use.

The origin of life is DNA and raw slurry made up of chemicals. Plants began 2.5 billion years ago (Proterozoic), and the earliest plants in the history of the earth belonged to fungi and algae, and then algae flourished for a time. It wasn't until 438 million years ago (Silurian period) that green algae broke free from the constraints of the aquatic environment and landed on the earth for the first time, evolving into naked ferns and ferns.

For the first time, the land is dressed in green.

With the development of modern science and technology, in countless painful lessons, the understanding has undergone a qualitative leap. In the long-term production activities, due to the change of production methods, there is a surplus of the fruits of hunting and gathering, and the domestication and breeding of animals and the cultivation of plants have produced primitive farming. Due to the differences in the conditions of production activities, people found that the fruits of labor obtained from nature were more time-consuming and laborious than the harvesting of breeding and planting, and agriculture became the main production activity of people, and plants became the object of human auxiliary labor.

This phenomenon has gone through a long time. If ancient plants provided living conditions for human beings, then modern plants have not only satisfied human survival. Human beings make use of the rational allocation of resources, speed up the cultivation of plant resources, adjust the diversification of plant species, and give full play to their higher functions and benefits.

This method is used reasonably and to a limited extent to provide abundant material goods for people's daily life. At the same time, increasing biological resources, protecting the diversity of biological species, enabling human beings to obtain the means of production and means of life, and obtaining the resulting spiritual products (including ideologies and concepts) are irreplaceable for human civilization and progress. Human research on basic natural science and applied science are inseparable from the products provided by plants.

Human aesthetics, art, and culture are also inseparable from the forests, trees, and flowers of plants. People's production and living environment requires the participation of plant species, and in this way, it cultivates people's thoughts and sentiments and creates a civilized moral atmosphere. In particular, the semi-public welfare of forest tourism, rest and health care, and the social function of running industries enable the public to come into contact with nature, improve the social environment, enhance people's physical and mental health, and promote social civilization and progress.

Seeds, germination, seedlings, flowering, fruiting.

The life cycle of a plant includes 5 processes, seed, germination, seedling, flowering, and fruiting.

Seeds are the beginning of the growth of all things, through germination, growth, flowering, and finally to fruit, the formation of seeds, the completion of a lifetime, this is also the natural law of the growth of all things, any kind of creature is alive, even leaves, but also from the leaf buds to grow, to the end of withering, death, to complete a lifetime.

The life cycle of a plant consists of 5 processes: seeding, germination, seedling, flowering, and fruiting.

The seed germination period is the beginning of the growth of all things.

Seeds are the beginning of the growth of all things, through germination, growth, flowering, and finally to fruit, forming seeds and completing a lifetime, which is also the natural law of the growth of all things.

Every living thing is alive, even the leaves of trees start to grow from leaf buds, and finally wither and die, completing their life.

In nature, all living organisms belong to living things.

Organisms should be divided into several kingdoms, and the organisms that can live sedentary and autotrophic are called the plant kingdom, referred to as the chain plant.

Plants have six major organs: roots, stems, leaves, flowers, fruits, and seeds.

Roots are the vegetative organs of plants, usually located below the surface, responsible for absorbing water and dissolving ions in the soil, and supporting and storing synthetic organic matter.

The stem is one of the vegetative organs of the base plant and is the visible trunk of most plants.

Seed is the structure of the ovule of the seed plant that grows after fertilization, and is generally composed of seed coat, embryo and endosperm.

Peanut flowers are placed on a receptacle, with petals (or tepals) on the outermost part, and the stamens and pistils of the plant are wrapped in the middle.

The fruit develops from the pistils of flowers, and the seeds of most plants are encased in the fruit.