Question

Give reason cells of tapetum have dense cytoplasm and more than one nucleus

Answer 1

The tape tum supports the development of pollen grains and synthesizes many components of the pollen wall.
Therefore, it is highly active and contains numerous organelles capable of synthesizing what the pollen grains require.

Answer 2

Cells of tapetum have dense cytoplasm and more than one nucleus:

Cells of tapetum show incomplete mitotic division as they undergo karyokinesis (nuclear division), without cytokinesis, leading to a multinucleate condition. The presence of multiple nuclei is not counter-productive to the development of the pollen grain, in fact, it is beneficial, as it provides a tighter control over the process of microsporogenesis (pollen grain formation) by the means of the regulatory factors produced by the nuclei.

Tapetal cells also have a dense cytoplasm as they responsible for producing sporopollenin, a protein that forms the pollen wall. This protein is essential for the survival and the viability of pollen grains, which is necessary to successfully carry out sexual reproduction. Thus, due to the high concentration of cell organelles carrying out protein synthesis, the cytoplasm of tapetal cells appears dense.