Скачать с ютуб Complex Permanent Tissue | Hindi | Xylem | Phloem | Structural Organisation In Plants | Biology в хорошем качестве

Complex Permanent Tissue | Hindi | Xylem | Phloem | Structural Organisation In Plants | Biology

Permanent Tissue Have you ever wondered how the tips of tall plants get water that is absorbed by the roots, deep down in the ground? Is there any special mechanism by which this happens? Well! It is not exactly a mechanism, but a group of specialized cells and tissues that help to carry out this function. You have already learned about one type of plant tissue, i.e. the Meristematic Tissues(Read). Plants also have other types of tissue called the permanent tissue in them. It is one of these tissues that help in the movement of water from the root to the stem. Permanent Tissue in Plants In simple words, the permanent tissues in a plant are those tissues that contain nondividing cells. The cells are also modified to perform specific functions in the plants. The cells of the permanent tissue are derived from the meristematic tissue. The permanent tissue cells are also fully differentiated. The cells are large and a definite shape and size. You can see intercellular spaces being present in between the cells. Large vacuoles are also present inside these cells. The metabolism that occurs in the cells of the permanent tissue is fairly at a lower rate. The permanent tissue in plants mainly helps in providing support, protection as well as in photosynthesis and conduction of water, minerals, and nutrients. Permanent tissue cells may be living or dead. Types of Permanent Tissues Permanent tissues can be classified into two types. They are: Simple permanent tissue Complex Permanent tissue Simple Permanent Tissues These tissues are simple. They are made up of only one type of cell. Here, all the cells that make up the tissue are similar and have the same structure, with the same type parts. Simple permanent tissues are again classified into three main types. They are parenchyma, collenchyma, and sclerenchyma. Parenchyma – The cells of this tissue are living, with thin cell walls. Cells can be oval or round in shape. They have a large central vacuole and a dense cytoplasm. The parenchyma tissue is located in the soft parts of the plant such as cortex and pith. It mainly acts as a packing tissue, providing mechanical support. It also helps in the storage of food. Based on the specific functions, parenchyma can be further classified into Aerenchyma and Chlorenchyma. Collenchyma – These cells are living cells and have an elongated shape. The corners of the cell wall are thickened. There is very little intercellular space present. The collenchyma tissue can be located in the leaf stalks, below the epidermis etc. Its main function is to provide flexibility to the plants as well as mechanical support. Sclerenchyma – The cells of the sclerenchyma tissue are dead. The cell wall is very thick due to the deposition of lignin. The cells of this tissue can be in different shapes and sizes. They are generally located in the leaf veins, hard coverings of the seeds and can also be found surrounding the vascular bundle. The main function of the sclerenchymatic tissue is to provide rigidity and mechanical support to the plant body. They also make the plant stiff and hard. Complex Permanent Tissue The complex permanent tissues are made up of more than one type of cell. They coordinate together to perform the same specialized functions in the plant body. They are classified into two types – Xylem and Phloem Xylem – The xylem tissue is responsible for the conduction of water and minerals from the roots to the leaves and stem. It also provides support to the plants. It has four elements. They are tracheids, vessels, xylem parenchyma and xylem fibres. Phloem – This complex permanent tissue helps in the translocation of food that is prepared by photosynthesis in the leaves to various parts of the plant. Phloem consists of four elements. They are sieve tubes, companion cells, phloem fibres and phloem parenchyma. #Xylem #Phloem Subscribe to our channel to watch free online lectures https://www.youtube.com/c/TopprClass8... For more videos, online classes, 24X7 Doubts solving and Mock tests, Visit Toppr - The better learning app. #BetterLearning on the Toppr app, download now Google Play: http://bit.ly/2vRBqcb App Store: http://apple.co/2vpRAr9 Website: https://www.toppr.com/ Download Doubts on Chat App: Android Play Store: http://bit.ly/2B6w7oy iOS App Store: http://apple.co/2ziAA75 Facebook:   / beingtoppr   Twitter:   / mytoppr   Instagram:   / mytoppr   LinkedIn:   / toppr-com