What is the use of plants absorbing inorganic salts???

The roots of plants absorb water and inorganic salts by osmosis and transport nutrients upwards through the tubes, which are dead cells, but the tubes are tubular like the blood vessels of the human body.

You want to know how its upward nutrient delivery force comes about? You wonder if it doesn't have the directional (upward) force of an animal's heart.

There are two forces exerted by the upward transport of nutrients:

1. This is the most important thing! The surface tension of water, which is the fundamental driving force of water upward. You can try it with a very thin tube (with both ends connected), wet the inside of the tube (it must be wet), and dip it into a bucket to expose part of the tube on the outside!

You will find that the water surface in the tube is higher than the water surface outside, and the finer the tube, the higher the water surface in the tube. This is where the surface tension of water comes into play.

2. Relying on the transpiration of the plant itself, the water evaporates on the surface of the plant and brings upward power to the water in the lower part of the plant.

A pipeline is just a pipeline!

Inorganic salts are one of the necessary components of cells, cell membranes are semi-permeable membranes, and the difference in salt concentration is the driving force for the exchange of substances between cells and the outside world (tissue fluid, etc.). When plants synthesize seeds that grow and pass on their own generations, nutrients such as protein are essential, and elements in inorganic salts such as nitrogen, phosphorus, and potassium are also one of the components of these substances, which cannot be obtained directly and can only be absorbed in the form of inorganic salts.

Nitrogen mainly has long leaves.

Phosphorus mainly blossoms and bears fruit.

Potassium mainly has long stems (above-ground and underground).

Right. It's like people want to eat salt.

In a general sense, living organisms are inseparable from water, and inorganic salts balance the concentration of biological fluids, and different inorganic salts have different effects in different tissues and organs. Plants absorb water by transpiration, that is, the leaves are evaporating water, and the water in the upper layer of the plant is relatively small, and the water is infiltrated from the soil by osmotic pressure into the roots and then to the leaves. Plants absorb inorganic salts by osmosis, that is, when the concentration of inorganic salts in the soil is greater than the concentration of inorganic salts in the root cell sap, they can enter the plant roots through osmosis, and then be transported to the whole plant body by the plant roots through body fluid transport.

1) Whether the plant absorbs water or loses water mainly depends on the concentration inside and outside the cell When the concentration of the cell fluid is greater than the concentration of the surrounding aqueous solution, the cell absorbs water; When the concentration of cell fluid is less than the concentration of the surrounding aqueous solution, the cell loses water The principle of water absorption and inorganic salts by plant roots: the concentration of cell fluid in plant root hairs When the concentration of surrounding soil solution: water absorption; Concentration of cell sap in plant root hairs When the concentration of the surrounding soil solution:

Dehydration. 2) The main organ of the plant to absorb water is the root, and the main part of the root water absorption is mainly the mature area of the root tip, and there are a large number of root hairs in the mature area, which can absorb water Water in the soil Root hair cells Layers of cells within the root bark Ducts in the roots Ducts in the stems The ducts of the petioles The ducts in the leaf veins (in the mesophyll) Mesophyll cells

Therefore, the answer is: (1) suck; Lose.

2) root hair cells;

Ca: Calcium can be used as a bridge between the phosphate group of phospholipids and the carboxyl group of proteins in biological membranes, thus maintaining the stability of membrane structure. In addition, calcium in the cytosol and soluble proteins form calmodulin, which acts as a "second messenger" in metabolic regulation.

mg: Mainly found in young organs and tissues, and concentrated in seeds when plants mature. Magnesium ions can activate various phosphomutases and phosphokinases during light and respiration.

S: Sulfur deficiency in plants will lead to green deficiency (initiated from mature and young leaves), dwarfing, accumulation of anthocyanins, etc. b：

When boron is deficient, the anthers and filaments atrophy, the velvet layer tissue is destroyed, and the pollen is stunted. Boron also has the effect of inhibiting the formation of toxic phenolic compounds. mn：

Manganese ions are activators of dehydrogenases, decarboxylases, kinases, oxidases, peroxidases, etc. in cells, especially affecting glycolysis and the tricarboxylic acid cycle. Manganese makes the water in photosynthesis crack into oxygen. When manganese is deficient, there is a lack of green between the leaf veins (young leaves or old leaves appear first), accompanied by the generation of small necrotic spots.

zn: Zinc is an essential element for chlorophyll synthesis. When the zinc is insufficient, the stem of the plant is short, the lotus cluster, the leaves are small and deformed, and the leaves lack green.