Write about tracheids.
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Tracheids are elongated cells in the xylem of vascular plants that serve in the transport of water and mineral salts.
They appear as polygonal and thick-walled. Pits are simple or bordered. The cell wall thickenings are due to the deposition of secondary wall substances.
They are annular, spiral, reticulate and pitted. The tracheids are cells with bordered pits on their end walls.
Tracheids are chief water-conducting elements in gymnosperms and pteridophytes.
The conduction of water and mineral salts takes place through the bordered pits. They also offer mechanical support to the plants.
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