Differentiate between parenchyma, collenchyma and sclerenchyma on the basis of their cell wall.
Solution and Explanation
Differentiate between Parenchyma, Collenchyma and Sclerenchyma on the basis of their cell wall.
| Parenchyma | Collenchyma | Sclerenchyma |
|---|---|---|
| These are living cells with thin walls. | These are living cells with slightly thick walls. | These are dead cells with thick cell walls. |
| Cells are uniformly thin. | Cells are elongated. | Cells are long and narrow. |
| The cells are loosely packed with large intercellular spaces. | The cells are irregularly thickened at the corners with very little intercellular spaces. | The cells are thickened due to lignin. These are so thick that there is no internal space inside the cell. |
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Concepts Used:
The Tissue System
Epidermal Tissue System:
The epidermal tissue system forms the outer-most covering of the whole plant body and comprises epidermal cells, stomata, and the epidermal appendages – the trichomes and hairs. The epidermis is the outermost layer of the primary plant body. It is made up of elongated, compactly arranged cells, which form a continuous layer. The epidermis is usually single-layered.
Ground Tissue System:
All tissues except the epidermis and vascular bundles constitute the ground tissue. It consists of simple tissues such as parenchyma, collenchyma, and sclerenchyma. Parenchymatous cells are usually present in the cortex, pericycle, pith, and medullary rays, in the primary stems and roots. In leaves, the ground tissue consists of thin-walled chloroplast-containing cells and is called mesophyll.
Vascular Tissue System:
The vascular system consists of complex tissues, the phloem, and the xylem. The xylem and phloem together constitute vascular bundles. In dicotyledonous stems, cambium is present between phloem and xylem. Such vascular bundles because of the presence of cambium possess the ability to form secondary xylem and phloem tissues and hence are called open vascular bundles. In the monocotyledons, the vascular bundles have no cambium present in them. Hence, since they do not form secondary tissues they are referred to as closed.
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