The ovules of gymnosperms are unitegmic (apparently bitegmic in $Gnetum).\$ The integument is three layered. In gymnosperms, the ovules are freely exposed before and after fertilization, $i.e.,\$they are not enclosed by an ovary wall.
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.