They result in branch formation and growth. They are responsible for growth in length of the plant and increasing the size of the internode. Intercalary meristem: Located between permanent tissues, it is usually present at the base of the node, internode, and on leaf base.The activity of this cambium forms secondary growth. Lateral meristem usually occurs beneath the bark of the tree as cork cambium and in vascular bundles of dicotyledons as vascular cambium. Lateral meristem: Cells which mainly divide in one plane and cause the organ to increase in diameter and girth.This meristem is responsible for the linear growth of an organ. They form growing parts at the apices of roots and stems and are responsible for the increase in length, also called primary growth. Apical meristem : Present at the growing tips of stems and roots, they increase the length of the stem and root.There are two types of meristematic Tissue ![]() New cells produced by meristem are initially those of meristem itself, but as the new cells grow and mature, their characteristics slowly change and they become differentiated as components of meristematic tissue, being classified as: Cells of this type of tissue are roughly spherical or polyhedral to rectangular in shape, with thin cell walls. It is in these regions that meristematic tissue is present. The primary growth of a plant occurs only in certain specific regions, such as in the tips of stems or roots. Meristematic tissue consists of actively dividing cells and leads to increase in length and thickness of the plant. Plant tissue Cross-section of a flax plant stem with several layers of different tissue types: With these tools, the classical appearances of tissues can be examined in health and disease, enabling considerable refinement of medical diagnosis and prognosis. Developments in electron microscopy, immunofluorescence, and the use of frozen tissue-sections have enhanced the detail that can be observed in tissues. The classical tools for studying tissues are the paraffin block in which tissue is embedded and then sectioned, the histological stain, and the optical microscope. Plant histology is studied in both plant anatomy and physiology. Xavier Bichat is considered as the "Father of Histology". The study of tissues is known as histology or, in connection with disease, as histopathology. The English word "tissue" derives from the French word "tissu", the past participle of the verb tisser, "to weave". ![]() īiological organisms follow this hierarchy:Ĭells < Tissue < Organ < Organ System < Organism Organs are then formed by the functional grouping together of multiple tissues. ![]() A tissue is therefore often thought of as an assembly of similar cells and their extracellular matrix from the same embryonic origin that together carry out a specific function. In biology, tissue is a historically derived biological organizational level between cells and a complete organ.
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