Sieve Cells are called this because the tubes act as one continuous cell. Sieve tubes are a collection of sieve tube elements that tend to look empty, have very prominent joints, and are very long. They don’t have a nucleus (like xylem, but are living cells), don’t have a cytoskeleton, have very few organelles (no Golgi, plastids or lignin; some ER, few mitochondria, have plasma membrane). There are companion cells next to sieve cell-ordinary cell that feeds sieve cell/keeps it alive. A ‘Sieve plate’ is the wall in between each cell. Sieve plates are almost like slime/goo and are very prominent-these are phloem clots (like a blood clot in a plant) stops the flow of nutrients. This is how plants keep nutrients from being lost if it is damaged/cut. They contains special clotting proteins and polysaccharides.
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