Essay on Plant Tissues

982 Words Aug 6th, 2012 4 Pages
Plant Tissues
A mature vascular plant (any plant other than mosses and liverworts), contains several types of differentiated cells. These are grouped together in tissues. Some tissues contain only one type of cell. Some consist of several.

Tissue is a cellular organizational level intermediate between cells and a complete organism. A tissue is an ensemble of similar cells and from the same origin, that together carry out a specific function. These are called tissues because of their identical functioning. Organs are then formed by the functional grouping together of multiple tissues.
Examples of tissue in other multicellular organisms are vascular tissue in plants, such as xylem and phloem. Plant tissues are categorized broadly into
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The upper and lower epidermis of the leaf are examples of protective tissue [View].
Parenchyma
The cells of parenchyma are large, thin-walled, and usually have a large central vacuole. They are often partially separated from each other and are usually stuffed with plastids.
In areas not exposed to light, colorless plastids predominate and food storage is the main function. The cells of the white potato are parenchyma cells. [View]
Where light is present, e.g., in leaves, chloroplasts predominate and photosynthesis is the main function. [View]
Sclerenchyma
The walls of these cells are very thick and built up in a uniform layer around the entire margin of the cell. Often, the cell dies after its cell wall is fully formed. Sclerenchyma cells are usually found associated with other cells types and give them mechanical support.
Sclerenchyma is found in stems and also in leaf veins. [View] Sclerenchyma also makes up the hard outer covering of seeds and nuts.
Collenchyma
Collenchyma cells have thick walls that are especially thick at their corners. These cells provide mechanical support for the plant. They are most often found in areas that are growing rapidly and need to be strengthened. Thepetiole ("stalk") of leaves is usually reinforced with collenchyma [View].
Xylem
Xylem conducts water and dissolved minerals from the roots to all the other parts of the plant.

In angiosperms, most of the water travels in the xylem vessels. These are thick-walled

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