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Hi Everyone! Welcome To My Channel "Ali Academy Biology Lectures" About This Video ........................ In This Video Lecture You Will Learn Basic Concept Of Significance Of Secondary Growth Signiicance of Secondary Growth Stem and root often begin to thicken after their apical meristem has produced embryonic or primary tissue. An increase in plant girth due to vascular cambium and cork cambium is called secondary growth. The result of secondary growth is most evident in woody perennial plants like trees, shrubs and vine. Secondary growth occurs due to cell division in : (i) Vascular cambium (ii) Cork cambium. Vascular cambium irst appears as a cylinder of actively dividing cells between primary xylem and In most trees, the conduction of water and dissolved substances by secondary xylem become to the inner surface of the vascular cambium, the other is the secondary phloem appearing outer primary phloem. Vascular cambium gives rise to two new tissues, one is the secondary xylem next at the base of trunk indicates the age of a tree at the time it was cut. rings are active in conduction at one time. The active portion is called sap wood. The inactive non to the vascular cambium. In most species, the heartwood accumulates a variety of chemicals such as resins, oils, gums and conducting wood is called heartwood. The secondary xylem causes most of the increase in stem thickness. Over the years a woody stem tannins. These provide a resistance to decay and insect attack, for example, in red cedar and gets thicker and thicker as its vascular cambium produces layer upon layer of secondary xylem. These layers are visible as rings. Since one growth ring is formed in one year, a count of the rings limited to the outer or younger portion of that tissue. As trees grow older only few annual growth conifers. About This Channel..................... I make these videos cause I love to draw and connect the complexity of science and medicine into art. I'm not saying. I'm 100% correct in all my videos, but I do try to obtain the information from credible sources. One-stop destination for all biology lectures. _ students in class 11, 12 or appearing for competitive medical exams ( NMDCAT ) will find it very beneficial _ The videos are categories under various heading to make the students life simplified Visit My Other Channel Playlist ..................... NMDCAT PART 1: • New 1st Year Biology NMDCAT PART 2: • New 2nd Year Biology Class 11th Lectures: • New 1st Year Biology Class 12th Lectures: • New 2nd Year Biology Class 10th Lectures: • Matric Biology Subscribe My Channel: / aliacademya7r Social Link........................ Instagram: https://instagram.com/ranaalibiologis...