Why is septum between 2 sieve tube elements called sieve plate - Biology - Anatomy of Flowering Plants

Question

Why is septum between 2 sieve tube elements called sieve plate??

Manik Mishra · Accepted Answer

Sieve tube cells are placed end to end in phloem The end walls may
be transverse or oblique They have many small pores called sieve
pits Each sieve pit is lined by a layer of callose Excessive growth
of callose closes the sieve pores Due to the presence of sieve pits
the end walls are commonly called sieve plates