Chollenchyma is which type of tissue
Answers
Answer:
Collenchyma is a cell and tissue type in which the primary walls are unevenly thickened and consist of homogeneous, more or less elongated living cells; it provides mechanical support to the plant organs where present.
Explanation:
i. Distribution:
Collenchyma cells are present at the periphery of herbaceous stems, petioles (e.g. Begonia) and in the ribs of some leaves (e.g. Nerium). They are also present in the floral parts, fruit and aerial root (ex. Monstcra). They usually occupy the peripheral layers of cortex in dicotyledons and may be present just beneath the epidermis or below a few peripheral layer of parenchymaThey may be present as a continuous layer to form hypodermis. Sometimes the cells form distinct ribs or ridges at the outer edges of stems (e.g. Leonurus, Cucurbita etc.) and petioles (e.g. Apium). They are uncommon in roots, monocotyledonous leaves and stems. Subterranean roots of Vitis and Diapensia contain collenchyma. The rind of fruits is collenchyatous in Vitis and Cassia tora.
ii. Origin:
Collenchyma develops from the ground meristem or from procambium (e.g. Apium graveolens). They may also originate from elongated cells, which resemble procambium.
iii. Shape:
Isolated collenchyma ranges from round, elliptical to elongated cell Transitional forms are also present. The round or elliptical cells resemble ground parenchyma. The cells may assume the shape of a short prism. The elongated cells look like fibre with both ends tapered and may attain a length of 2 mm though rarely.
iv. Arrangement:
Collenchyma tissue appears to be more or less compactly arranged as the thickening materials deposit more heavily at the corners and on the radial walls of cell in addition to normal uniform thickeningthickening.
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Answer:
COLLENCHYMA is a Supportive Pemanent tissue.