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How can the age of a tree be estimated from the analysis of the rings present on a cross section of its stem?
For the growth of the tree it is essential to have formation of new vessels within the stem, a task performed by the vascular cambium. The vascular cambium is more active in hot seasons (spring and summer) forming a lighter band made of large calibered vessels. During winter and fall the vascular cambium makes the opposite, so small calibered vessels and a darker band appears outside the previous lighter band. Therefore a two ring bands are made yearly, one lighter and the other darker. By a direct count of these band pairs one can estimate the age of the tree.
Tissue Valves : Tissue valves mounted on a frame with a sewing ring are inserted by the same technique as used in the case of prosthetic valves.
GLANDS - 1 . LACRYMAL GLANDS - Tear glands numbers are 3. Its secretion is aquous & salty, keeps eye ball wet, give nourishment to cornea. Lysozyme also present
Protection of protein meals or bypass protein The protein of oil cakes, having higher protein degradability, such as groundnut cake, mustard cake are utilized in the rumen les
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Describe the difference between dna and protein. (structural unit, linkage bond, primary and spatial structure)
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