1. The act of boring or piercing through a part.
Origin: L. Perforare = to pierce through
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... sieve-tubes and transports the sugar throughout the plant body . The tracheids, vessel elements, and sieve-cells are all lines with pits and have perforations and open discs for transport. Xylem does have lignified cell walls, but they're covered in the pits for diffusion. 2) You have it pretty ...
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