define parenchyma collenchyma and sclerenchyma
Answers
Parenchyma
Parenchyma is a tissue composed of living cells, usually having only thin primary cell walls and varying widely by morphology and metabolism. Parenchyma in the primary plant body often occurs as a continuous mass, such as in the cortex or pith of stems, roots, mesophyll and flesh of fruits. The common characteristic of all parenchyma cells is that they are living at maturity and capable of cell division, making them plays an important role in wound healing and tissue regeneration.
Other important thing to note about parenchyma tissue is that they may be specialized to function in photosynthesis, storage or transport. Also, parenchyma is important to vascular tissues in the sense that it provides a route of exchange for materials within and between the xylem and phloem.
Collenchyma
Collenchyma is a tissue composed of elongated cells with irregular thick cell walls that provide support and structure. Their thick cell walls are composed of compounds cellulose and pectin. These cells are often found under epidermis or the outer layer of cells in young stems and in leaf veins.
Sclerenchyma
Sclerenchyma is a protective or supporting tissue in higher plants composed of cells with thickened secondary layers made from cellulose, hemicelluloses and lignin. Fibres and sclereids are the main types of sclerenchyma cells.
The cell orientation of the cellulose in sclerenchyma is naturally designed to provide diverse combinations of strength, flexibility and stiffness in plant organs subjected to different compressive and tensile stresses.
Answer:
Parenchyma cells are found in every soft part of the plant, but collenchyma cells are found in specific part of the plant like leaves, stems, and petioles, whereas sclerenchyma cells are found in mature parts of the plants or trees. ...
Collenchyma is a permanent tissue, which gives flexibility to plants. Parenchyma is a permanent tissue, which stores nutrients and water which consists of relative unspecialised cells with thin cell walls. Sclerenchyma is a permanent tissue which makes the plant hard and stiff.
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