Question

What is the chemical nature or composition of the cell wall thickening?

Answer 1

Answer:

Collenchyma tissues are mainly found under the epidermis in young stems in the large veins of leaves. The cells are composed of living, elongated cells running parallel to the length of organs that it is found in. Collenchyma cells have thick cellulose cell walls which thickened at the corners. Intercellular air spaces are absent or very small. The cells contain living protoplasm and they sometimes contain chloroplasts. Collenchyma cells are usually living and have only a thick primary cell wall made up of cellulose and pectin.

Botanists typically classify collenchyma cells into four main types - angular (thickened at intercellular contact points), tangential (cells arranged into ordered rows and thickened at the tangential face of the cell wall), annular (uniformly thickened cell walls) and lacunar (collenchyma with intercellular spaces). Collencymal cell wall is not made of lignin, cellulose or suberin.

Explanation:

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Answer 2

Collenchyma cells are a form of permanent tissue made up of similar cells. It contains cell walls that are irregularly thick and give support and structure. The chemicals cellulose and pectin make up their thick cell walls. These provide the cell its strength and stiffness.

Carbohydrate-rich components make up the majority of the cell wall. Cellulose, pectins, hemicelluloses, proteins, and phenolics are the main components of the cell wall. The cell wall is a biphasic structure made up of moderately hard cellulosic microfibrils embedded in a non-cellulosic matrix that looks like a gel.