Parenchyma, Collenchyma and Sclerenchyma Cells

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by esimpson33
Last updated 5 years ago

Discipline:
Science
Subject:
Biology
Grade:
9,10,11,12

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Parenchyma, Collenchyma and Sclerenchyma Cells

Ground Tissue System

Parenchyma cells are the most abundant ground tissue cells. They have large vacoules and relatively thin cell walls. They perform photosynthesis (in the shoot) and store protein (in fruits) and starch (in roots).

Parenchyma, Collenchyma, and Sclerenchyma Cells

Sclerenchyma cells have very thick cell walls reinforced with the polyphenol polymer lignin. Most sclerenchyma cells undergo programmed cell death (apoptosis), but their strong cell walls remain to provide support for the plant. There are two types of sclerenchyma cells: fibers and sclereids. The elongated fibers provide rigid support to wood and other parts of the plant. Example is bark on trees. Sclereids occur in various shapes and may pack together densely, as in a nut shell or in some seed coats.

Almost all of the tissue lying between dermal and vascular tissue in both the shoots and roots is part of the ground tissue system. The ground tissue system makes up most of the plant body. Ground tissue contains three different cells. It contains the Parenchyma cells, Collenchyma cells, and Sclerenchyma cells.

Collenchyma cells are elongated and have thick cell walls. They provide support for growing tissues such as stems. For example the familar strings in celery consist primarily of collenchyma cells.


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