Here's why:
* Haploid means having only one set of chromosomes.
* Diploid means having two sets of chromosomes.
* Sporophyte is the diploid stage of a plant's life cycle. It produces spores through meiosis, a process that reduces the chromosome number by half.
* Spores are haploid cells that develop into the gametophyte stage of the plant.
Therefore, the sporophyte stage is diploid, while the spores it produces are haploid.