In a diplontic life cycle,the zygote:

Statement $X$: $Allium$ $cepa$ shows a diplontic life cycle.
Statement $Y$: The diploid sporophytic phase is the main,long-lived,dominant,photosynthetic,and independent phase.

In the given figure,what do $''A''$ and $''B''$ represent respectively?

Give an example of plants with:
$(a)$ Haplontic life cycle
$(b)$ Diplontic life cycle
$(c)$ Haplo-diplontic life cycle

What is a haplontic life cycle? Explain through a chart.

What are the gametophyte and sporophyte stages? Explain.