What green plants get from the soil

First, the design idea:

Biology experiments play a very important role in the teaching of biology at the secondary school level. It is not only an important means to train students in basic skills, but also to stimulate students' interest in learning, improve the quality of teaching and cultivate students' analytical and observation skills. In the first lesson of this lesson, through the experiment on the influence of nitrogen-containing inorganic salts on plant growth, students can understand that plant growth needs inorganic salts, inorganic salts can be absorbed from soil solutions, and roots can absorb inorganic salts from soil solutions, and plant growth not only needs nitrogen-containing inorganic salts, but also phosphorus-containing and potassium-containing inorganic salts, and deepen their understanding of their effects, so as to further understand the principle and significance of rational fertilization.

In the second lesson of this lesson, students will first verify the effect of the concentration of external solutions on the water absorption of cells through experiments, and further let students design experiments to verify the principle of water absorption by roots. In this way, students have a perceptual understanding of the principles of water absorption and water loss by plants, and on this basis, the reasons for water absorption and water loss by plants are emphatically clarified.

Through first-class experiments, students' interest in learning is stimulated, and students are guided to actively acquire biological science knowledge, comprehend scientific research methods, connect with reality, and verify the principle with students' familiar life phenomena.

First of all, let's look at the definition of soil, which is the surface layer of the loose and porous structure on which "green plants" can grow on the earth's land surface. It can be seen that the main function of soil is to grow green plants, highlighting the importance of soil to plants.

Second, the soil is the base of plant growth and reproduction, and the five basic elements of green plant growth and development: light, heat, water, air and nutrients, of which nutrients and water are mainly absorbed from the soil through the root system (although there is also foliar fertilization, but very little).

Third, plants can stand in nature, withstand wind and rain, and do not lodging, because the root system stretches out in the soil and obtains the mechanical support of the soil. All of this shows that plants must be soil-based. Plants can't live without soil.

Plants also play an important role in the soil, while plants absorb soil nutrients, the organic matter produced by plant photosynthesis remains in the soil after its death, which is the role of soil return and soil nutrients, such as leguminous nitrogen fixation, and various green manure are helpful to soil fertilization. At the same time, plants also have the role of soil and water conservation, reduce soil erosion, and conserve water sources; Plants also play an important role in improving the soil and maintaining soil temperature.

Green plants get water, inorganic salts and nutrients from the soil.

Although 2012 is not the end of the world, but I believe that the end of time may one day really come back, now the relationship between man and nature is extremely tense, human beings over-cut forests, blind development and farming, wanton destruction of vegetation, resulting in soil erosion, land desertification; the indiscriminate exploitation of natural resources, which depletes underground mineral deposits; Wastewater, waste, and exhaust gases are continuously discharged, causing serious deterioration of the natural environment. So, I believe, the end of the world is really back.

Human beings have taken too much from nature, and have suffered from nature's ruthless revenge: hurricanes, torrential rains, blizzards, floods, droughts, insect pests, scorching heat, forest fires, ** and other disasters have come unexpectedly, frequently hitting the five continents, we will never forget, in 1998 in China's Yangtze River, Songhua River and other places in a hundred years of flood disasters, this national flood disaster, direct economic losses of more than 25 billion US dollars.

Every day, there are many "environmental guards" who carry plastic bags and pick up confetti in all corners of the campus, and they work hard to purify and beautify the campus environment. However, we also often see scenes that we don't want to see: after breakfast, there are milk cartons on the playground, after dinner there are fruit peels on the stairs, and at noon there are confetti and grocery bags in the hallway.

Looking at the lawn again, spring is the time when everything grows, but we still have classmates trampling on it, and in the green belt of the school, we find deep footprints from time to time, and some places even walk into a wide avenue.

Students, man and nature should live in harmony, and environmental awareness is the hallmark of modern people. We need to be on campus, around us, and globally. Bend down to pick up confetti, don't throw it around; Take a few extra steps and don't cross the green belt and trample on the green space.

Don't take the good as small, don't take the evil as small", start from me, start from the small things, start from the side, start from now. Protect the green vegetation and purify the campus.

Summary. The main content of the factory of soil and green plants is that with advanced facilities, it can achieve precise manual control, so as to realize the dream of the growth of all things in the plant factory.

The main content of the factory of soil and green plants is that with the first application of advanced posture, it can achieve accurate artificial control, so as to realize the dream of all things in the plant factory.

Analysis: This article is an expository article, focusing on the "plant factory", which is to use the principle of photosynthesis to give plants enough light and necessary nutrients, so as to turn high-rise buildings into workshops for collecting food and fruits. With advanced facilities, the most man's front wall is equipped with advanced facilities, and it can be accurately controlled manually, so as to realize the dream of the growth of all things in the plant factory.

Expansion: With the continuous growth of population, the depletion of land resources, and the frequent occurrence of extreme weather events, the development of traditional agriculture has reached a "bottleneck period". Therefore, scientists envision using advanced planting techniques to extend agriculture upwards.

This stems from the principle of plant growth - all things grow by the sun, and plants use sunlight to photosynthesize spring, convert carbon dioxide and water in the air into glucose, starch and other organic matter, so that they can grow taller and grow until they bloom and bear fruit. Using this principle, under suitable conditions, if plants are given enough light and necessary nutrients, crops can be "planted" into the air, high-rise buildings can be turned into farms, and grain, melons and fruits can be produced by means of workshop production.

Plant growth needs water, inorganic salts and organic matter Among them, water and inorganic salts are absorbed from the soil by root hairs, and the organic matter produced by photosynthesis of plant leaves will be transported down to the stems and roots through the sieve tube It is transported to the stem through the sieve tube in the leaf, and then transported from the stem to the organs such as fruits and roots Therefore, the inorganic matter needed for the life of green plants can be absorbed from the soil by the roots without branches is correct

So the answer is:

Test Answer: The roots of the plant absorb the water and inorganic salts of pure oranges from the outside through the duct from the bottom to the stem, and then through the stem to the leaves, flowers, fruits and other organs The organic matter produced by the photosynthesis of green leaves of green plants is transported to the stem through the sieve tube in the leaf, and then transported from the stem to the fruit and root and other organs The organic matter transported through the sieve tube, in addition to meeting the living needs of the plant itself, the remaining organic matter is mainly stored in organs such as fruits and seeds Therefore, The statement that the organic matter needed for the life of green plants can be sucked from the soil by the roots is false

So the answer is:

(1) A complete ecosystem includes biotic and abiotic components, and biotic components include producers, consumers, and decomposers Producers mainly refer to green plants, which can produce organic matter through photosynthesis to provide material and energy for themselves and other organisms in the biosphere; Therefore, the green plants in the diagram are the producers of this ecosystem

2) Consumers mainly refer to various animals, which play an important role in promoting the circulation of substances in the biosphere; Animals also help plants pollinate and disperse seeds, and the insects and birds in the picture are consumers in the ecosystem

3) Decomposers refer to bacteria and fungi and other saprophytic microorganisms, which can decompose the organic matter in the remains of animals and plants into inorganic matter and return it to the inorganic environment, which promotes the circulation of substances It can be seen that bacteria and fungi are decomposers in the ecosystem and rely on the decomposition of organic matter in the remains of animals and plants to maintain life; It can be seen that the carbon dioxide, water, and inorganic salts produced by the decomposition of animal and plant remains can be reused by plants

Therefore, the answer is: (1) organic matter; Produce;

2) Consumers; Seed; Substance;

3) decomposition; Organic matter; Carbon dioxide; Water; Inorganic salts

Seeds contain a lot of genetic material and can grow into adult plants that are similar to their parents.

As soon as the seeds absorb water and swell, the body begins a chemical reaction, which converts nutrients into sugars through enzymes, and the plant begins to grow. When the leaves begin to expose the soil, see the sunlight, and begin photosynthesis, they will get rid of the limited nutrients in the seeds, and begin to produce nutrients on their own, and gradually grow.

In order for seeds to germinate, in addition to their own vitality, they also need the cooperation of environmental conditions such as moisture, temperature, air, and light. Seeds need to grow in order to reproduce offspring.

It seems that there is no green soil.

There are about 61 types of soil in China, mainly black soil, white soil, brick red soil, brown soil, loess, red soil, soil, clay, sand, dark brown soil, white clay soil, gray desert soil, loess soil, red clay, aeolian sandy soil, purple soil, fluvial soil (light meadow soil), swamp soil, rice irrigation silt soil and irrigation desert soil.

If the soil is only dark green on the surface, it may be due to the large amount of green algae attached to the surface of the soil. Its acidity and alkalinity cannot be determined.

1. Lime is often used for soil acid soil improvement. To achieve the purpose of neutralizing active acids, latent acids, and improving soil structure. Calcium-containing shell ash is used in coastal areas.

Purple shale powder, fly ash, plant ash, etc. can also be used. Lime application rate Quicklime requirement (g m2) = cation substitution amount * (1 - salt base saturation) * soil weight * 28 * 1 1000

2. Artificial acidification of neutral and calcareous soils Flowers in the open field can be made with sulfur powder (50g square meters) or ferrous sulfate (150g square meters), which can reduce the pH unit. It can also be watered with alum fertilizer water. 3. Gypsum is applied to alkaline soil, and phosphogypsum, ferrous sulfate, sulfur powder, and acidic weathered coal can also be used.