Answer:
The gametophyte stage which is multicellular is used to produce gametes to perform the reproduction of plant to produce zygotes.
Step-by-step explanation:
In the reproduction procedure of plant generation, the multicellular stage of haploid or the gametophytes through the mitosis procedure, makes gametes which helps in producing zygote. And to produce multicellular sporophyte these zygotes develops itself. So, it is evident that to produce gametes, gametophytes are essential in pollens of plant.