What are the types of plant ducts Types of plant ducts Differences Evolutionary direction

Ducts: 1, Tubular tissue in the xylem of plants that channel sap. It is formed by many tubular dead cells connected up and down.

2. It generally refers to the pipe used for grooming.

3. The duct is a kind of cell that is dead, only the cell wall and the upper and lower cells are through, located in the xylem of the vascular bundle, it's.

The function is very simple, it is to absorb water and inorganic salts from the roots.

It is transported to the whole body of the plant.

A pipeline that transports organic nutrients in the phloem of a plant. It is formed by many tubular living cells connected up and down. There are many small holes in the transverse wall of the adjacent two cells, called "ethmoid holes". The protoplasts of the two cells communicate with each other through the ethmoid pores.

Sieve tubes: Sieves are distributed in angiosperms.

After maturation, the sieve molecule loses most of its organelles.

Only the next companion can provide nutrients. Sieve molecule and companion cell** in the same sieve mother cell. The apex of the sieve tube molecules are connected to each other, and the cell walls are perforated to form a sieve plate.

The contact cable runs up and down through the sieve hole to regulate transport. The companion cells are connected with the sieve molecules through plasmodesmata to maintain the morphology and osmotic pressure of the sieve molecules.

and provide it with nutrients and energy.

The duct (vessel) is a tubular structure in the xylem of plants that mainly transports water and inorganic salts. It is composed of a string of highly specialized tubular dead cells with perforated end walls connected to each other, each of which is called a ductal molecule or ductal node. The duct molecule is a living cell in the early stages of development, and after maturation, the protoplasts disintegrate and the cell dies.

During maturation, the cell wall is lignified and has different forms of secondary thickening such as ring, thread, trapezoid, reticulated and porosity. The end wall between two adjacent catheter molecules dissolves to form a perforated plate. In angiosperms, except for a few families and genera (such as Quinlan and Cyanus spp.), there are ducts; The ducts are also found in the order Mawria in certain ferns (e.g., juniper, European fern) and gymnosperms.

Ring conduit, threaded conduit, trapezoidal conduit, reticulated conduit and perforated conduit.

I've learned before.

Ring catheters, threaded catheters, trapezoidal catheters, reticulated catheters and perforated conduits.

You can learn about the construction of the catheter from upstairs. I won't say more.

In fact, it can be distinguished from the literal meaning, which is based on the secondary thickening, some are thickened in a circle, and some are thickened in a spiral shape.

Some of the thickened parts show trapezoidal patterns, some are staggered and connected into a net, and some are lignified and thickened except for the pores.

For the above five types, the pipe diameter is thickened sequentially.

In terms of system evolution, the duct is a more evolved type with thick molecules and perpendicular to the longitudinal axis. The end bib has a single perforation and is more evolved than the double perforation.

The five types of catheters, such as ringed conduits, threaded conduits, trapezoidal conduits, reticulated conduits, and perforated conduits, are more evolved from the latter than the front.

The thick diameter of the pipe is conducive to transporting moisture.

Of course, all five of these ducts are present in the stems of plants, and the first two types of ducts leak out early, in the native xylem. With the thickening of the stem, that is, the appearance of metaxylem and secondary xylem, the first two are crushed and broken (the remnants can be seen in the specimen with a microscope), and of course the last three ducts appear (they all appear after the elongation growth stops, of course, in the metaxylem and secondary xylem).

1. Duct: The pipeline for transporting water and inorganic salts in the xylem of the plant body is composed of many cylindrical cells with disappearing transverse walls connected up and down, and the liquid can flow in the tube. Roots, stems, and leaves all have duct ridges and are connected.

Water and inorganic salts and other substances dissolved in water are generally transported from the bottom up.

2. Sieve tube: The pipeline for transporting organic nutrients in the phloem of the plant body is formed by connecting many cylindrical cells on and under the hail.

There are many small pores in the transverse wall of the upper and lower adjacent cells, called ethmoid pores. Roots, stems, and leaves all have sieve tubes and are connected.

It can transport substances in both directions, and it is generally necessary to transport organic matter mainly to the sail.

1. Ductal plants constitute the phylum Tracheophyta. Gymnophytes make up the phylum Psilophyta; Lycophyta, lycophyta; Horsetail, phylum Sphenophyta; ferns, pterophyta; cycads, phylum cycads (cycadophyta); Ginkgo biloba, phylum Ginkgophyta; Buy hemp vine plants, buy hemp vine plants (gnetophyta); conifers, conifers, phylum coniferophyta; There are flowering plants, angiosperms phylum (anthophyta).

2. Duct plants have actual roots, stems, and leaves. Most of them live on land, but some live in water (like lotus). Vascular plants include gymnoferns (whiskferns), stone pines (clubmosses), horsetails, ferns (ferns), cycads (cycads), ginkgoes, gnetophytes, conifers and floweringplants.

3. Ductal plants are the most diverse and most abundant plants; Ductal plants are also called vascular plants because they have vasculature or conductive tissue.

4. These tissues can be divided into two categories, xylem and phloem, which transport fluids to plants.

1) The difference between plant sieve and catheter:

Physiological activity: Sieve tubes are made up of living cells, and ducts are made up of dead cells.

Presence of site molding: sieve tube in phloem and duct in xylem.

Physiological function: The sieve tube mainly transports organic matter, and the catheter transports water and inorganic salts slowly.

Thickness of catheter and sieve tube: Generally, the length of the sieve tube molecule is between 100 and 2000 microns, and the diameter is only 20 30 microns. The length and thickness of the duct molecules vary greatly among various plants, and the diameter of the duct molecules in most plants is generally between 20 and 30 microns.

2) The role of catheters and sives: There are two main transport channels in the plant body - conduits and sives. The ducts are dead cells, located in the xylem, that transport water and accommodable inorganic salts down from the roots.

Sieve tubes are living cells, and each sieve cell also has a companion cell, located in the hail phloem, which transports the synthesized organic matter to various parts of the plant.

Both the plant's canals and ducts are important components of plant cells, and together they play a role in the growth and development of plants. The lodging tube is a structure in plant cells that is mainly responsible for the transport of water and nutrients in plants. It is made up of one or more cells, their cell wall and cytoplasm have special functions, and there are many organelles in their cytoplasm, such as mitochondria, plastids, nucleus, etc., which can synthesize and consume water and nutrients, thereby regulating the growth and development of plants.

The duct is another structure in the plant cell that is mainly responsible for the transport of water and nutrients in the plant. It is made up of a series of cells, their cell wall and cytoplasm have special functions, and there are many organelles in their cytoplasm, such as mitochondria, plastids, nucleus, etc., which can synthesize and consume water and nutrients, thereby regulating the growth and development of plants. Unlike residential tubes, ducts have a thinner cell wall that allows for faster transfer of water and nutrients, and they do not have organelles in their cytoplasm, so they cannot synthesize and consume water and nutrient nutrients, but only for transport.

In conclusion, both the tube and the duct are important components of plant cells, and together they play a role in the growth and development of the plant. The cell wall of the duct is thicker than the cell wall of the duct, and there are many organelles in their cytoplasm that can synthesize and consume water and nutrients, whereas the cell wall of the duct is thinner than the cell wall of the duct, and they have no organelles in their cytoplasm and can only play the role of transport.

The duct is in the xylem and the sieve is in the dermis! When you make a cut in the skin with a knife, the liquid will come out, which is the thick flow of the sieve tube.

The duct is in the xylem and the sieve is in the phloem. The stem structure of dicots from the outside to the inside is the phloem, cambium, xylem, and pith.

Conduit: A pipe that transports water and inorganic salts within the xylem of a plant body, located in the xylem of a plant.

Sieve pipe: A pipe that transports organic nutrients in the phloem of the plant body, located in the phloem of the plant.

Roots, stems, and leaves all have ducts and sieve tubes, and they are connected.

The ducts are located in the xylem of the plant and are responsible for transporting water and inorganic salts upwards to provide mineral nutrients to the plant. The xylem is located in the main axis of the plant** and also contains tracheids and wood fibers, which play the main role of supporting and transporting water and inorganic salts.

The sieve tube is located in the phloem of the plant and is responsible for transporting organic nutrients to other tissues of the plant. The phloem is usually located on the periphery of the xylem and may contain companion cells and bast fibers, which act as a transport of nutrients and protection.

The rhizomes and leaves of plants contain vascular bundles, that is, they all have a certain amount of ducts and sieve tubes.

The difference between sieve and catheter is mainly manifested in the cell condition, transport direction and transport route:

1.Cell: The duct of the plant is composed of a string of tubular dead cells, only the cells of the cell wall, and the upper and lower cells are through, and the sieve tube is the living cell of the phloem.

2.Transport direction: The plant duct is responsible for the unidirectional transport of water and salt from the root up in the xylem, while the sieve tube is responsible for the bidirectional transport of organic matter from the leaf to the root in the phloem.

3.Transportation route: Although catheters and sieves belong to the transport tissues of plants, the main purpose of plant catheters is to transport water, while sieves mainly transport organic matter.

The sieve tube is a living cell structure, the duct is the dead cell, the sieve tube is located in the phloem, the duct is located in the xylem, the sieve tube mainly transports organic matter, and the duct mainly transports salt and moisture.

The difference between a plant sieve and a conduit.

1. Physiological activity: The sieve tube is composed of living cells, and the duct is composed of dead cells.

2. Location: The sieve tube is located in the phloem, and the catheter is located in the xylem 3. Physiological function: The sieve tube mainly transports organic matter, and the catheter transports water and inorganic salts.

There are also ducts that transport the water and inorganic salts absorbed by the roots upwards, and sieves that transport the organic matter made by plant leaves from top to bottom.