sieve cell


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sieve cell

n.
An elongated, food-conducting cell in phloem characteristic of gymnosperms and ferns, having pores but lacking sieve plates.
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In gymnosperms, a more primitive type of sugar-conducting cell, a sieve cell, performs essentially the same function, although the efficiency of transport is reduced.
In the inner bark of conifers, densely packed sieve cells with minute pores in their walls pass the nutrients slowly from cell to cell.