Multiple choice Seeds of which of the following plants are enclosed within the fruits? Thallophytes Pteridophytes Gymnosperms Angiosperms Reveal answer Fill a bubble to check yourself D Correct answer Explanation Angiosperms are defined by having seeds enclosed within fruits (the ovary develops into a fruit after fertilization). Thallophytes and Pteridophytes don't produce seeds at all, while Gymnosperms produce naked seeds without fruit protection.