Phloem Sieve cells have sieve areas on their lateral walls only and are not arranged one above the other in linear rows. Phloem is composed of four kinds of cells: sieve elements, companion cells,phloem parenchyma and phloem fibres. It is crushed by the developing metaphloem. Tracheids are chief water conducting elements in gymnosperms and pteridophytes. It contains. They are annular (ring like), spiral (spring like), scalariform (ladder like), reticulate (net like) and pitted (uniformly thick except at pits). Complex tissue prevents water loss and they even help in gaseous exchange. They coordinate together to perform the same specialized functions in the plant body. If the perforation plate has many pores, then it is called multiple perforation plate. Permanent tissue encompasses all cells, living or dead, that have stopped dividing and maintain a permanent position within a plant. Nervous Tissue Definition Nervous tissue is the term for groups of organized cells in the nervous system, which is the organ system that controls the body’s movements, sends and carries signals to and from the different parts of the body, and has a role in controlling bodily functions such as digestion. . Complex problems are questions or issues that cannot be answered through simple logical procedures. Learn about the main tissue types and organ systems of the body and how they work together. Connective Tissue Disorder Connective tissue disorders may be due to mutation of genes or by inherited faulty genes. The xylem, which is derived from procambium, is called primary xylem and the xylem, which is derived from vascular cambium, is called secondary xylem. Simple tissue is made up of the same type of cells and mostly covers the surface of both, internal organs of the body and external organs of the body. Read More The three types of permanent tissue are simple permanent tissue, complex permanent tissue Plant Tissue - Meristematic Tissue, Permanent Tissue - Simple Permanent Tissue: Parenchyma, Chlorenchyma. They are distinguished into sieve cells and sieve tubes.Sieve cells occur in pteridophytes and gymnosperms, while sieve tubes occur in angiosperms. Xylem and phloem are examples of complex tissues. Define gray matter in the spinal cord. While complex tissue consists of xylem and phloem. Companion cells are present only in angiosperms. Xylem fibres are dead cells and have lignified walls with narrow lumen. Complex Permanent Tissue: Xylem, Phloem. They are also known as connectivity tissue in animals and vascular tissue in plants. Above and beyond tissues, plants also have a higher level of the structure called plant tissue systems. The two genetic disorders of connective tissue are epidermolysis bullosa (EB) and Marfan syndrome. An example of simple tissue is muscle tissue. However, in Gnetum of gymnosperms, vessels oc-cur. Xylem (Greek word 'xylos'= wood) is a complex tissue that is mainly responsible for the conduction of water and mineral salts from roots to other parts of the plant. The main function of vessel is conduction of water and minerals. Tissue, in physiology, a level of organization in multicellular organisms; it consists of a group of structurally and functionally similar cells and their intercellular material. See more. A) It is neural tissue that contains the cell bodies of sensory neurons whose axons carry information to the spinal cord. Sieve elements are the conducting elements of the phloem. In biology, tissue is a cellular organizational level between cells and a complete organ. Xylem parenchyma is the only living tissue amongst the consituents of xylem. These tissues can be simple, consisting of a single cell type, or complex, consisting of more than one cell type. Its lumen is broader than that of fibres. Organs are then formed by the functional grouping together of multiple tissues. Xylem and phloem are examples of complex tissues. Simple tissue has wide distribution and complex tissue has restricted distribution. Photosynthesis produces the sugar glucose. See more. There are different types of cell wall thickening due to deposition of secondary wall substances. A tissue that consists of several kinds of cells but all of them function together as a single unit is called complex tissue. Complex tissue carries out the function of conduction or transportation. Most of the tissues they have are supportive, which provides them with structural strength. Answer to: 1. Complex tissue is made up of different types of cells. The fibres of sclerenchyma associated with the xylem are known as xylem fibres. Complex permanent tissue: Different types of cells in the complex permanent tissue perform different goals. The end wall contains a number of pores and it looks like a sieve. They are classified into two types – Xylem and Phloem Function Simple permanent tissue: Photosynthesis, food storage, tissue repair, and secretion are the main functions of simple permanent tissues. Tracheids are imperforate cells with bordered pits on their end walls. Complex Plant Tissue The complex tissues in a plant deal with moving nutrients and water to the leaves, while removing the products of photosynthesis from the leaves.