What are the specialized protective layers surrounding the megasporangium, which can differ in quantity, known as?

Explanation

The integuments are the protective layers that encase the megasporangium, varying in number depending on the species. These coverings safeguard the developing female gametophyte. In contrast, the sporangium is the structure producing spores, the ovule includes the megasporangium plus integuments, and the pericarp is the fruit wall formed after fertilization.