Tapetal cells consist of a large number of the nucleus and it is generally polyploidy in nature. Division of the tapetal cell takes place by mitosis and after mitosis cytokinesis does not take place and this type of mitosis is known as endomitosis and it results in the binucleate or multinucleate tapetum.

Why are tapetum cells Binucleated?

Answer: Tapetal cells are very large cells with many nuclei. ... Tapetal cells undergo endomitosis where the nucleus in the nuclear membrane divides, but cytokinesis does not occur. Therefore they are bi/poly nucleate.

Why the tapetum has more than one nucleus?

It provides nourishment to the growing microspores(pollen grains). Cells of tapetum have dense cytoplasm and more than one nucleus. The binucleate(with two nucleus) or multinucleate(more than two nucleus) condition arises due to fusion of two uninucleate(one nucleus) cells of tapetum.