Cycas and Adiantum resemble each other in having
(2) motile sperms
Adiantum is a fern (pteridophyte) and Cycas is a gymnosperm.
∵ Adiantum has no seeds and no cambium, and neither plant has vessels in its xylem ⇒ (1), (3), (4) are ruled out.
∵ Both have multiflagellate motile male gametes (sperms) ⇒ they resemble each other in having motile sperms.
Answer: (2)
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