Answer:
diploid sporophyte
Step-by-step explanation:
Seed plants, also called spermatophyes, are the most diverse group of plants. They exhibit the ALTERNATION OF GENERATIONS in their reproductive life cycle. The diploid plant called the "SPOROPHYTE" produces the haploid spores via meiosis. The haploid spores germinate into the haploid "GAMETOPHYTE"
The gametophyte body of the plant produces gametes (male and female), which fuses in a process called Fertilization to form a diploid zygote, which develops into the SPOROPHYTE in order for the cycle to start again. However, in seed plants, THE DIPLOID SPOROPHYTE generation is the dominant form.