Answer:
True
Explanation:Yes, the first flowering plants had a Polygonum type of embryo sac. According to the search results, the embryo sac of both Arabidopsis and maize follows the Polygonum type arrangement, which is the most common developmental pattern in angiosperms. Additionally, the normal or Polygonum type of embryo sac is described as monosporic eight nucleate, which is the typical arrangement found in many flowering plants