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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.
How do mineral salts participate in enzymatic activity? Many mineral salts are cofactors of enzymes. i.e., they are substances without which enzymes do not work.
Question 1. Which are the 3 different processes in the formation of urine? Explain 2. Discuss resting membrane potential and nerve action potential 3. Name the chemical s
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