Plants only absorb water and inorganic salts.

Soilless culture can reasonably meet the needs of different plants and different growth periods of the same plant for various mineral elements (or inorganic salts).

The reason why plants can be cultivated without soil is that

Answer b

Analysis: This topic investigates the soilless culture of plants. First, the concept of soilless culture is clear.

Answer: Soilless culture refers to the cultivation of plants by mixing inorganic salts into nutrient solution in a certain proportion according to the types and quantities of inorganic salts needed for plant life without using soil. Because the water and inorganic salts absorbed by roots come from soil, and soil particles only fix plants, plants can be cultivated without soil.

So choose: B.

Comments: Plant soilless culture is a way of asexual reproduction, which mostly appears in the form of multiple-choice questions.

Do plants need soil for growth? What is the reason?

Not necessarily/possibly

The function of soil particles is only to fix plants, and soil solution is useful for plants in soil.

Glass balls can also be used instead, and nutrient solution suitable for plant growth prepared in advance can be added to make soilless culture.

Internal factors affecting the growth of flowers in soilless culture

What kind of plants are cultivated in indoor soil?

Soil cultivation refers to providing plants with soil and various nutrient solutions.

Lightweight materials such as soil-cultivated peat or forest humus soil and expanded vermiculite are used as nursery substrates to fix plants, so that the roots of plants directly contact nutrient solution. The modern seedling raising technology of mechanized precision sowing is adopted. The roots of seedlings are intertwined with the matrix in the seedling tray to form a plug, which is called soil-plugging seedling raising.

Soilless culture refers to the cultivation of plants with soil and other things, including hydroponics, fog (gas) culture and substrate culture.

Soil for seedling cultivation uses non-soil solid substances as substrate to irrigate nutrient solution, or hydroponics or fog cultivation of seedlings with any substrate. According to whether the substrate is used for nutrient solution seedling raising, vermiculite, perlite, rock wool and other substrates are used for nutrient solution seedling raising. Users use any substrate and some supporting nutrient solution.

/kloc-in the 9th century, Knoop and others invented planting techniques in the 1930s, and the improvement of agricultural production techniques in the 20th century made soil farming develop.

Soil cultivators prepare culture solution to provide mineral nutrition for plants. Soil-cultivated seeds provide nutrition by using nutrient solution containing essential elements for plant development, so that plants have a complete life cycle. Soil cultivation technology is the key to whether plants can provide suitable nutrient solution with coordinated proportion and concentration.

The culture solution used for soil culture is recycled, and the mixed culture solution is selectively absorbed by plants. The concentration of some ions decreases faster than others, and the pH value of each element changes gradually to meet the needs of plants. Because the concentration of some ions is continuously determined by selective electrode, NaOH or HCl should be used to adjust the pH of the culture solution during the interval and supplement the acid added by self-control. The recycling of alkali or supplementary elements will limit the continuous cultivation of solid inert medium and culture solution, so it is necessary to regularly discharge nutrient solution or use point irrigation culture solution to supply enough oxygen to plant roots. When the concentration of culture solution increases, it is necessary to supplement some water and soil culture work. The key is to manage the culture medium well to meet the needs of excellent nutritional status.

The nutrient solution for soil cultivation is easy to control and suitable for adjusting light and temperature. Deserts, beaches and desert islands without soil all need quantitative fresh water supply, so it is necessary for suburban families to grow vegetables and flowers with soil.

What is the main reason for the increase of plant weight in soilless culture?

Plants carry out photosynthesis and fix carbon dioxide.

What is the reason for the success of soilless culture?

The reason for the success of soil culture is that there are inorganic salts in the culture solution.

Soilless culture refers to the cultivation of plants by mixing inorganic salts into nutrient solution in a certain proportion according to the types and quantities of inorganic salts needed for plant life without using soil. Because the water and inorganic salts absorbed by roots come from soil, and soil particles only fix plants, plants can be cultivated without soil.