All of them are structures found in different plants with the role in reproduction.
Flowers are found in flowering plants (angiosperms). Gametophyte (sexual phase within the life cycle of plants) develops inside the flower (e.g. ovules are located internally). Seeds are inside the protective shell.
The cones are the organs of plants, found in the conifers (Pinophyta), that contain the reproductive structures. The cones are woody structures and the seeds are naked in them.
Spores are also structures for the reproduction. The spores might be included in asexual reproduction: haploid and unicellular which develops into a new organism via mitosis, when the conditions are favorable. They can be part of the sexual reproduction in seed plants when they are included in the formation of more complex structures such as the seeds and pollen grains.
