Solution

Microsporogenesis - The formation of microspores inside the microsporangia of seed plants. A diploid cell in the microsporangium, called a microsporophyte or a pollen mother cell, undergoes meiosis and gives rise to four haploid microspores. Each microspore then develops into a pollen grain.
Megasporogenesis - The formation of megaspores inside the ovules of seed plants. A diploid cell in the ovule, called a megasporophyte or a megaspore mother cell, undergoes meiosis and gives rise to four haploid megaspores. In most plants, only one of the megaspores then goes on to develop into a megagametophyte within the ovule, while the other three disintegrate. In the ovules of angiosperms, megasporogenesis takes place within a structure called a nucellus, and it is the megaspore farthest from the micropyle of the ovule that survives.
So, the correct answer is 'Involve meiosis.'