explain complex permanent tissue ( xylom and pholem )
Answers
Answer:
Xylem and Phloem
Explanation:
Xylem consists of tracheids vessels xylem parenchyma and xylem fibres. Tracheids and vessels have thick walls and many are dead cells when matured. They are tubular structures.
Phloem is made up of 5 types of cells. They transport food from leaves to other parts of plants. They are living cells
[tex][/tex]Complex permanent tissue is defined as a collection of structurally dissimilar cells performing a common function or set of functions. They are made up of more than one type of cells. They are of two types xylem and phloem. Xylem is the chief water conducting tissue of the plants. It functions as a conducting tissue for water and minerals from the roots to the stems and leaves. Phloem is the chief food carrying tissue of the plants. It is a living tissue that carries food materials, from the place it is available to the places where it is needed.
XYLEM
Xylem is one of the two types of transport tissue in vascular plants, phloem being the other. The basic function of xylem is to transport water from roots to stems and leaves, but it also transports nutrients. Mature xylem is made up of dead cells that do not have cell contents, while phloem contains living cells (albeit without nuclei). The structure of xylem and phloem is also different. While xylem is made up of tracheids and vessels, phloem is made up of sieve tubes which have many holes for transporting nutrients. Xylem is the tissue of vascular plants that transports water and nutrients from the soil to the stems and leaves. Xylem plays an essential 'supporting' role providing strength to tissues and organs, to maintain plant architecture and resistance to bending. The tension created by transpiration “pulls” water in the plant xylem, drawing the water upward in much the same way that you draw water upward when you suck on a straw. Cohesion (water sticking to each other) causes more water molecules to fill the gap in the xylem as the top-most water is pulled toward the stomata.
PHOLEM
Phloem is the living tissue in vascular plants that transports the soluble organic compounds made during photosynthesis and known as photosynthates, in particular the sugar sucrose, to parts of the plant where needed. This transport process is called translocation. Phloem is the vascular tissue in charge of transport and distribution of the organic nutrients. The phloem is also a pathway to signaling molecules and has a structural function in the plant body. It is typically composed of three cell types: sieve elements, parenchyma, and sclerenchyma. Phloem cells conduct food from leaves to rest of the plant. They are alive at maturity and tend to stain green (with the stain fast green). Phloem cells are usually located outside the xylem. The two most common cells in the phloem are the companion cells and sieve cells. Phloem, also called bast, tissues in plants that conduct foods made in the leaves to all other parts of the plant. Phloem is composed of various specialized cells called sieve tubes, companion cells, phloem fibres, and phloem parenchyma cells.The xylem and the phloem make up the vascular tissue of a plant and transports water, sugars, and other important substances around a plant. ... Phloem is responsible for transporting food produced from photosynthesis from leaves to non-photosynthesizing parts of a plant such as roots and stems.