Concept:Sexual propagation is reproduction through the fusion of male and female gametes, which occurs in flowering plants via seeds.
Explanation:In agriculture, plant propagation is divided into two main types.
Sexual propagation uses seeds produced after pollination and fertilisation.
These seeds contain embryos formed from the union of gametes.
Asexual or vegetative propagation uses vegetative parts of plants.
Bulbs, cuttings, and vines are all vegetative structures.
They do not involve gamete fusion or seed formation.
Therefore, among the given options, seeds are the only structures used for sexual propagation.
Spores are also sexual reproductive units in lower plants like ferns and mosses, but they are not listed here.
Answer:B. Seeds