telecom - (often plural) systems used in transmitting messages over a distance electronically. telecommunication. sampling - measurement at regular intervals of the amplitude of a varying waveform (in order to convert it to digital form)
The cells in vascular tissue are typically long and slender. Since the xylem and phloem function in the conduction of water, minerals, and nutrients throughout the plant, it is not surprising that their form should be similar to pipes.
The stiff cell walls of the xylem also provide support for the fern plant as it grows taller. The other vascular tissue, phloem, is responsible for moving glucose throughout the plant. Phloem tissue is comprised of sieve elements; live cells which have lost their nuclei, and companion cells; which seem to âtake care ofâ the sieve cells.