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All higher plants are multicellular in constitution. In the case of lower plants, they may
be either unicellular or consist of a few cells and act as a colony or a filament. In the
case of higher plants, the numerous cells are organised variously. A group of cells,
having more or less the same size, shape, structure, origin and function constitutes a
tissue. The tissues are formed in response to a basic division of labour. All such tissues
have a definite function to perform in the plant body and all of them work together
harmoniously in an organism. These cells are similar in structure and function; such
cells together form a tissue.
On the basis of the stages of development, the tissues are broadly divided into
meristematic and permanent.
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