No, Nucleus can not contain nucleus. The nucleus is an organelle found in eukaryotic cells. Inside its fully enclosed nuclear membrane, it contains the majority of the cell s genetic material. This material is organized as DNA molecules, along with a variety of proteins, to form chromosomes.

The reproductive cycle in angiosperms can be traced from before the shedding of pollen. The generative cell may divide to form two sperm cells before the pollen grain (developing male gametophyte) is shed or while the pollen tube is growing during germination.