Question

Cycas and Adiantum resemble each other in having
A. Seeds
B. Motile sperms
C. Cambium
D. Vessels.

Answer 1

They both have different morphological structure. Cycus has multi-flagellated and very large sperm cells.Seeds, cambium are common in gymnosperms and absent in pteridophytes.

Complete answer:
To answer this question, first, we need to know about the Cycas and Adiantum. Cycas is a genus of 105 species of branchless tropical and subtropical ornamental cycads, these trees are 12 metres or more long in height. Their leaves are dark green and circinate (uncoiling as fern leaves do), differing from those of other members of the family in having a midrib but no lateral veins.
Adiantum, the maidenhair fern, is a genus of about 250 species of ferns in the subfamily Vittarioideae of the family Pteridaceae, though some researchers place it in its own family, Adiantaceae.
Now, let us find the solution from the option.
Adiantum, called as single hair fern, is a pteridophyte similar to cycas (gymnosperm) consisting of motile sperm. Seeds, cambium is usual in gymnosperms and lack in pteridophytes. True vessels are lacking in both gymnosperms and pteridophytes.

Thus, the correct option is B. i.e. Motile sperms.

Note: The cycas plants are dioecious, and the family Cycadaceae is specific among the cycads in lack seed cones on female plants, but rather a group of leaf-like structures called megasporophylls each with seeds on the lower margins, and pollen cones or strobilus on male individuals. Adiantum plants are distinctive in appearance, with dark, often black stripes and rachises, and shining green, often distinctly cut leaf tissue. The sori are grown sub marginally, and are enclosed by reflexive flaps of leaf tissue that are the same with indusia. Dimorphism between fertile fronds and sterile is usually subtle.