(bot.) A longitudinal tube in the phloem of flowering plants, consisting of a connected series of individual cells (sieve cells) and serving to conduct organic food materials through the plant.
A tube through which food is conducted in angiosperms, formed of a series of sieve-tube elements joined end to end.
Sieve-tube Sentence Examples
The end wall is usually very thin, and the protoplasm on artificial contraction commonly sticks to it just as in a sieve-tube, though no perforation of the wall has been found.
The structure formed by a number of such cells placed end to end is called a sieve-tube (obviously comparable with a xylem-vessel), and the end-wall or area of endwall occupied by a group of perforations, a sseve-plate.
When the sieve-tube has ceased to function and the protoplasm, slime strings, and callose have disappeared, the perforations through which the slime strings passed are left as relatively large holes, easily visible in some cases with low powers of the microscope, piercing the sieve.plate.