Question

In botany , what is nacreous thickening in sieve element ?​

Answer 1

Answer:

Explanation:

Sieve elements typically have non-lignified cellulosic walls similar to those of parenchyma cells. The walls are often thickened and in most instances this thickening is described as “nacreous” thickening or the “nacre” wall. ... Between the primary walls of continguous cells is the intercellular substance.