Tuesday, 13 July 2021

Pericycle parenchymus cells are usually single layered

  Pericycle parenchymus cells are usually single layered



 Lie at different radii and alternate for each plant anatomy.  Phloem is in the form of bundles small protophloem is not differentiated.  The xylem protoxylem is well marked.  It is in contact with the pericycle.  The oval patches in contact are large and wedge-shaped.  Therefore, the xylem is exhausted per bundle.  Xylem bundles appear as rays.

 Depending on the number of xylem strands, the root is called dicer (2 xylem bundles, e.g., tomatoes), triarch (3 xylem bundles, e.g., peas), tetraarch (4 xylem bundles, e.g., sunflowers), a hexahark proxylum.  .  Small and narrow elements, while metaxylem consists of large and broad elements.  The contact of individual xylem bundles may form a centrally located metaclimate plate, for example, sunflower.  In some, the metaxylem portions of individual xylem bundles remain separate, so that a small pit is present.  In the center, for example, Village.

 Between the adjacent xylem and phloem bundles lies a layer or two of thin-walled cells called conjugated parenchyma or tissue.  Conjunctival parenchyma separating sap and food channels.  In addition, it produces the major part.

 Means the vascular cambium of dicot roots, the phloem is composed of sieve tubes, companion cells, and the phloem parenchyma.  Fibers are scarce, as are grams.  The xylem consists of vessels and some tubules.  Xylem parenchyma and.  Xylem fibers are somewhat shortened.

 The pericycle is made up of parenchymus cells.  It is usually single layered, e.g., sunflower, pea, gram.  This is more than one layer in some cases, for example, mulching.  At the root, the pericycle is very important.  This root is the seat of branching formation.  It gives rise to the cork cambium (phylogene) and a smaller part of the vascular cambium.  Vascular strand It consists of 2-6 radial bundles each of phloem and xylem.

 Internal structure of Dictyloidonus and Monothelonus 



 Anatomy of Dictyloidonous and Monothylonous Plants: Internal structure of the primary dicot root: It is studied in the transverse section of the young root of sunflower, pea or gram.  The primary root is the one that contains only the primary permanent tissue that is formed from the vegetative shoot apex.  Secondary tissues are absent.  The primary dicot is cylindrical in root outline.

 It appears circular in transverse section (TS).  The various tissues present in the dicot root from outside to inside are epiblema, cortex, endodermis, pericycle and vascular strands.  Pericycle and pith, if present, are thought to be part of the stele with vascular bundles.  Endodermis is considered to be the inner layer of the cortex.  Epibilema: This is the outermost layer of the young root.

 Epiblema is equivalent to the epidermis of the stem.  However, it is devoid of stomata and cuticle.  Cells are thin- wall and tubule.  They appear rectangular—the barrel that T.S.  is in size.  Some of the epilema cells form thin-walled tubular structures called long roots.  The cells that produce root hairs are called trichoblasts.  The cells are smaller than other epiblast cells.

 Because of the presence of root hairs, the epiblema is also called the sessile layer (L. pilus - hair, carrying the furrow).  Another name for epiblema is rhizodermis (root, derma skin).

 Cortex: It consists of several layers of thin-walled parenchyma cells.  Intercellular spaces are small but abundant, cortical cells may be round, oval or angular.  He stored the food.  However, the main function of the cortex in the root hair zone is the flow of water and minerals from the epilemma to the interior of the root.  Endodermis: This is the specialized inner layer of the cortex.  Endodermis is unilateral.  The cells appear barrel-shaped.

 As a result, scientific discoveries and new inventions change



 Factors bringing about social change: Some factors are the driving force behind social change.  It is as follows: Human intelligence and its inventions: Since humans are intelligent animals, curiosity and curiosity are intensified in humans.  As a result he makes scientific discoveries and new inventions.  This includes changes in their accommodation facilities, changes in their eating habits, food as well as their dress.

 Amusement equipment is going through many changes.  Changes are taking place due to scientific inventions, commercial, industrial as well as agricultural.  Social and cultural exchange has become possible due to the means of transport and communication.

 Changes in Social Values: Scientific discoveries are accompanied by technological developments which result in changes in the values ​​of the society.  Social values ​​have changed rapidly as a result of the changing political, social, economic trends of the world.  Such changes are as follows.

 Changes in the personal life of the people, changes in food habits and living habits, changes in living and dress, changes in social customs, traditions in traditional families. Such changes are sometimes caused by sudden calamities like drought, earthquake,  are caused by torrential rains and drought.  It has far-reaching impact on the human life of the society.

 Cultural factors: Cultural factors also play an important role in the direction of social change.  Culture is the product of social change.  The people living in a society have their own distinct cultures and subcultures.  The interaction between these cultures continues unabated.  Thus, due to such cultural exchange of different people, social changes take place, which cultural patterns change from generation to generation and bring about changes in the society.

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