DENDROLOGY

Detailed explanation-1: -A megaspore develops into a female gametophyte containing a haploid egg. A new diploid sporophyte is formed when a male gamete from a pollen grain enters the ovule sac and fertilizes this egg.

Detailed explanation-2: -Megaspore mother cell differentiatiation (red) occurs and it can undergo megasporogenesis and megagametogenesis to form a haploid female gametophyte (blue).

Detailed explanation-3: -A megaspore mother cell, or megasporocyte, is a diploid cell in plants in which meiosis will occur, resulting in the production of four haploid megaspores. At least one of the spores develop into haploid female gametophytes (megagametophytes). The megaspore mother cell arises within the megasporangium tissue.