Growth in Vascular Plants

Growth in Vascular Plants - are pushed further inward and...

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Growth in Vascular Plants Vascular plants undergo two kinds of growth, called primary and secondary growth. Primary growth occurs in the apical meristems, located at the tip of both root and shoot, and is mainly a growth of vertical length. The meristems are regions of rapid mitotic division, almost a cell- making factory. When a cell divides, one of its offspring moves down into the plant body where it elongates, and the other remains in the meristem to divide again. Secondary growth is a growth of thickness. Secondary growth is a product of two different, though related, tissues, which both fall under the umbrella term lateral meristems. Vascular cambium exists between xylem and phloem; on its inside the cambium produces what is known as secondary xylem, on its outside it forms secondary phloem. The primary xylem and phloem
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Unformatted text preview: are pushed further inward and outward, respectively. As xylem gets older it often becomes clogged and ceases to function; this tissue is called heartwood, in direct contrast to sapwood, which comprises the functioning xylem cells. The vascular cambium is more productive during the growing seasons. During the rest of the year it creates little growth. This phenomenon creates distinct rings of growth, each ring representing a single growing season. By studying these rings, it is possible to calculate the age of a plant, and even possible to determine the specific conditions of a particular growing season. The second lateral meristem is called cork cambium, and is responsible for the formation of cork (bark), which replaces the epidermis is the protective covering of shoot and root....
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This note was uploaded on 01/27/2012 for the course BIOLOGY BSC1005 taught by Professor Rodriguez during the Winter '09 term at Broward College.

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