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Parenchyma serves as a packing tissue in plants; Therefore, they do not have intercellular spaces. Collenchymatous tissues are mechanical tissues in plants and are characterized by the deposition of cellulose at cell corners, leading to a localized thickening of the cell wall.
Apical and intercalary meristems bring about primary growth (increase in height) and secondary growth (increase in diameter) respectively and are classified under meristematic tissues. Meristematic tissues are dividing plant units and contain dense cytoplasm and large nuclei with few or no vacuoles at all.