The microgametophyte is contained within the tough, protective coat of the pollen grain. The entire microgametophyte (pollen grain) is transferred to the vicinity of the megagametophyte by a process of pollination. Wind or animals usually accomplish this transfer.

Where is Megagametophyte produced?

The megagametophyte develops within the megaspore of extant seedless vascular plants and within the megasporangium in a cone or flower in seed plants. In seed plants, the microgametophyte (pollen) travels to the vicinity of the egg cell (carried by a physical or animal vector), and produces two sperm by mitosis.

Where is Gymnosperm Megagametophyte?

The haploid megaspore inside the nucellus gives rise to the female gametophyte, called the megagametophyte. In gymnosperms, the megagametophyte consists of around 2000 nuclei and forms archegonia, which produce egg cells for fertilization.