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Answer: Cycas is the only living species in the family Cycadaceae. All other species of the Cycadaceae family are extinct, as of now. Cycas plant is often considered as the living fossil and the plant of the Old World; because it is found only at those places where some of the oldest rocks in the world are found. Because of these reasons, Cycas is also known as the ‘relic of the past’.
Besides that, Cycas resembles more with Pteridophytes than any Gymnosperms. This proves a phylogenetic relationship between Pteridophytes and Gymnosperms.
Some features of Cycas which prove this are as follows: -