What moves through sieve cells in plants?

Sieve tubes are cells (collectively referred to as other associated phloem cells) that conduct photosyntheses (sugars). Sieve plates are porous (sieve) are the ends of the sieve cells.

Sieve tubes are the main conductive element of the angiosperm phloem. He lives, but enucleates and settles longitudinally. Ribosomes and dicytosomes are absent in the mature protoplast. Sieve tubes have lattice and sieve areas on their transverse end walls. The sieve tube consists of longitudinal cells that are connected to each other through lattice regions on their transverse end walls. The cell wall is usually primary, consisting mainly of cellulose and pectin.