The stages of non-flowering plant reproduction can be arranged in the following order:
- Sporophyte - The diploid phase that produces spores through meiosis.
- Spores - The haploid cells that are produced by the sporophyte and can develop into gametophytes.
- Gametophyte - The haploid phase that develops from the spores and produces gametes.
- Gametes - The reproductive cells (sperm and eggs) produced by the gametophyte.
- Zygote - The diploid cell formed when the gametes fuse during fertilization.
So, the complete order is: Sporophyte → Spores → Gametophyte → Gametes → Zygote