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.
1.Xylem parenchyma are the only living cells of Xylem,rest all cells are dead. 2.Phloem fibres are the only dead cells of phloem,rest all are living. 3.Vessels in xylem and seive tubes in phloem are a characterstic feature of Angiosperms i.e. flowering plants. 4.Gymnosperms and pteridophytes have trachieds for ascent of sap(conduction of water) and sieve cells for translocation.