Which one of the following structures is not a part of vegetative propagation?

Vegetative propagation is a form of asexual reproduction in plants where new individuals arise from vegetative parts such as roots, stems, or leaves without the production of seeds or spores.

• Rhizomes (e.g., ginger), Bulbs (e.g., onion), and Tubers (e.g., potato) are all modified stems that serve as vegetative propagules, allowing the plant to reproduce asexually.
• An Archegonium is a multicellular structure or organ that produces and contains the female gamete (ovum). It is found in the gametophyte stage of bryophytes, pteridophytes, and gymnosperms. Because it is involved in the production of gametes for fertilization, it is a part of sexual reproduction, not vegetative propagation.