In which one of the following, the male and female gametophytes don't have free-living independent existence?

Step-by-step solution

Cedrus is a gymnosperm having reduced dependent gametophytes- pollen and endosperm. In gymnosperms the male and the female gametophytes do not have an independent free-living existence and remain within the sporangia and are retained on the sporophytes. Hence, option D is correct.