The aura can be in the form of prismatic colors, flashes of light, and sometimes stars. They usually last about 20 minutes and then go away. If these flashes or lines of light occur without a headache, it is called an ophthalmic migraine, or a migraine without a headache.
In gymnosperms and flowering plants, the megaspore is produced inside the nucellus of the ovule. During megasporogenesis, a diploid precursor cell, the megasporocyte or megaspore mother cell, undergoes meiosis to produce initially four haploid cells (the megaspores).
Answer Wiki. Not in all, but many haploid fungi and algae have a temporary diploid stage in their life cycle from the fusion of two cells produced by mitosis. These fused cells are obviously diploid, and will then undergo a meiosis. The end result is a sexual spore.