Question

What do you mean by 'Sieve Plate' ?

Answer 1

Sieve plates are the connection sites between sieve elements. During early development of young sieve tubes, sieve plates resemble normal cell walls. As in other cell walls, plasmodesmata connect the cytoplast of adjacent sieve elements. Later in development however, plasmodesmata in sieve plates undergo a significant structural alteration. Callose (a cell wall material similar to cellulose) is deposited around the plasmodesmata. During late developmental stages, when the nucleus and other organelles disintegrate, the callose is removed which leads to a significant increase of the plasmodesmata lumen until a pore is formed. The number and size of pores and plates is very variable and depends on the species and developmental state of the plant.

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Answer 2

Hi friend
A sieve plate is a perforated wall between the sieve elements in the plant.
Hope it helps you if so plz mark mine as the brainiest answer.