Difference between Sieve cells and Sieve tubes (Sieve cells vs Sieve tubes)

Both sieve cells and sieve tubes are constituents of phloem involved in conduction of food

Sieve cells vs Sieve tubes

Sieve cells
1. Sieve cells are elongated cells with tapering end walls
2. Sieve cells have no companion cells associated with it
3. In sieve cells, the sieve areas do not form sieve plates
4. In sieve cells, the sieve areas are not well differentiated
5. Found in pteridophytes and gymnosperms
Sieve tubes
1. Sieve tubes consist of vertical cells placed one above the other forming long tubes connected at the end walls by sieve pores
2. Sieve tubes have companion cells associated with it
3. In sieve tubes, the sieve areas are confined to sieve plates
4. In sieve tubes, the sieve areas are well differentiated
5. Found in angiosperms