EVERYDAY SCIENCE

Detailed explanation-1: -There are two types of sieve elements: sieve cells and sieve tube members (Figure 4.6A). Sieve cells have only sieve areas on both end and side walls. Sieve tube members have both sieve areas and sieve plates (Figure 4.5B).

Detailed explanation-2: -They are the conduits of food (mostly sugar) transport from the leaves to the rest of the plant. In angiosperms, these cells are known as sieve tubes. In non-angiospermous vascular plants-e.g., gymnosperms, lycophytes, and ferns-rows of sieve cells, showing more primitive structural features, perform the same function.

Detailed explanation-3: -description. …the cell walls known as sieve areas, which have either small pores or large pores; the latter are known as sieve plates. Sieve plates are mostly located on the overlapping adjacent end walls.

Detailed explanation-4: -Sieve Cells vs Sieve Tubes Sieve cells are long elongated cells found in gymnosperms and other seedless vascular plants. Sieve tubes are short specialised cells that are found only in angiosperms. Long cells with narrow pores. Short cells with wider pores.